Nothing Special   »   [go: up one dir, main page]

CN115196901B - Environment-friendly regeneration, recovery and disposal method of cement blocks - Google Patents

Environment-friendly regeneration, recovery and disposal method of cement blocks Download PDF

Info

Publication number
CN115196901B
CN115196901B CN202210919733.XA CN202210919733A CN115196901B CN 115196901 B CN115196901 B CN 115196901B CN 202210919733 A CN202210919733 A CN 202210919733A CN 115196901 B CN115196901 B CN 115196901B
Authority
CN
China
Prior art keywords
coarse aggregate
recycled coarse
nano
recycled
prepare
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202210919733.XA
Other languages
Chinese (zh)
Other versions
CN115196901A (en
Inventor
胡国华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pinghu Kaiyuan Concrete Co ltd
Original Assignee
Pinghu Kaiyuan Concrete Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pinghu Kaiyuan Concrete Co ltd filed Critical Pinghu Kaiyuan Concrete Co ltd
Priority to CN202210919733.XA priority Critical patent/CN115196901B/en
Publication of CN115196901A publication Critical patent/CN115196901A/en
Application granted granted Critical
Publication of CN115196901B publication Critical patent/CN115196901B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/10—Coating or impregnating
    • C04B20/1055—Coating or impregnating with inorganic materials
    • C04B20/1077—Cements, e.g. waterglass
    • C04B20/1085—Waterglass
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/16—Waste materials; Refuse from building or ceramic industry
    • C04B18/167—Recycled materials, i.e. waste materials reused in the production of the same materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/023—Chemical treatment
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/04—Heat treatment
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/10—Coating or impregnating
    • C04B20/1055—Coating or impregnating with inorganic materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Civil Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The application relates to the field of construction waste recovery, and relates to an environment-friendly recycling and disposal method for cement blocks. An environment-friendly regeneration, recovery and disposal method of cement blocks comprises the following steps: adding the cement blocks into a crusher for crushing treatment to prepare fragments; putting the fragments into a heating device, introducing air at 250-450 ℃ for heating, then grinding, and screening to obtain regenerated coarse aggregate; soaking the recycled coarse aggregate in the modified solution, continuously stirring, and then drying at 100-120 ℃ to prepare the filling modified recycled coarse aggregate; and soaking the filling modified recycled coarse aggregate in the strengthening liquid, heating to 180-200 ℃, continuously stirring, and then drying at 100-120 ℃ to prepare the strengthened recycled coarse aggregate, thereby completing the recovery and disposal of the cement block. The method has the advantage of improving the strength of the recycled coarse aggregate obtained after the cement block is recycled.

Description

Environment-friendly regeneration, recovery and disposal method of cement blocks
Technical Field
The application relates to the field of construction waste recovery, in particular to an environment-friendly recycling and disposing method of cement blocks.
Background
With the continuous acceleration of urbanization, the construction industry can create a large amount of construction waste every day, and the construction waste rapidly occupies the living space of people, which causes great troubles, so in order to solve the problem, the construction waste is recycled by people. The construction waste comprises wood, cement blocks, metal waste materials and the like, the construction materials need to be sieved, and different construction waste can be put into use again after being treated by different processes.
Most of the building materials are cement blocks, so the recovery amount of the cement blocks is large, and the cement blocks can be reused as recycled coarse and fine aggregates after recovery treatment, so that the pollution of building wastes to soil, atmosphere and water can be effectively reduced, and the current situation that supplies of sand and stones are not in demand is solved. However, in the existing recovery method, only the cement blocks are simply crushed, screened and crushed, and the obtained recycled coarse aggregate has the problems of more cracks, larger pores, irregular surface, mortar covered on the surface and the like, so that the strength of the recycled coarse aggregate is low, and the recycled coarse aggregate is directly used for preparing concrete and has poor performance.
Disclosure of Invention
In order to improve the strength of the recycled coarse aggregate obtained after the cement block is recycled, the application provides an environment-friendly recycling and disposal method for the cement block.
The application provides a cement block's environmental protection regeneration is retrieved and is dealt with method adopts following technical scheme:
an environment-friendly regeneration, recovery and disposal method of cement blocks comprises the following steps:
step 1: adding the cement blocks into a crusher for crushing treatment to prepare fragments;
step 2: putting the fragments into a heating device, introducing air at 250-450 ℃ for heating for 1-1.5h, then grinding for 15-25min, and screening after grinding to obtain a regenerated coarse aggregate;
and step 3: soaking the recycled coarse aggregate in the modified solution, continuously stirring for 1-2h, and then drying at 100-120 ℃ for 2-3h to prepare the filling modified recycled coarse aggregate;
step 4: soaking the filling modified recycled coarse aggregate in the strengthening liquid, heating to 180-200 ℃, continuously stirring for 2-6h, then drying at 100-120 ℃ for 2-3h to prepare the strengthened recycled coarse aggregate, thus completing the recycling treatment of the cement blocks.
By adopting the technical scheme, as the heating grinding method is adopted, the mortar calcium carbonate attached to the surfaces of the fragments is decomposed into calcium oxide, and then the calcium oxide is ground, so that the mortar on the surfaces of the regenerated coarse aggregates can be effectively removed. And the temperature and time of grinding both have different effects on the strength of the recycled coarse aggregate, so the application provides an optimal temperature and time range, thereby improving the performance of the recycled coarse aggregate. The mortar on the surface of the recycled coarse aggregate cannot be completely removed by grinding, so that the performance of the recycled coarse aggregate still needs to be improved, gaps of the recycled coarse aggregate are filled through a modification solution, so that the strength of the recycled coarse aggregate is further improved, and then the mortar on the surface of the recycled coarse aggregate is subjected to reinforced modification through a reinforcing solution, so that the strength of the recycled coarse aggregate is further improved.
Preferably, the strengthening liquid comprises the following raw materials in parts by weight: 4-10 parts of filler, 0.5-1 part of 3-chloropropyltriethoxysilane and 90-100 parts of water, wherein the filler comprises one or more of water glass, sodium silicate and nano silicon carbide.
By adopting the technical scheme, the silicate gel can be hardened and precipitated from the water glass, the pores or cracks of the regenerated coarse aggregate can be blocked, so that the density and the strength of the regenerated coarse aggregate are improved, the silicate gel can be coated with mortar to form a hydrophobic film, the water absorption is reduced, the precipitation of nano-fillers in the regenerated coarse aggregate can be prevented, and the water glass can also generate hydraulic calcium silicate colloid to improve the strength; however, the rate of the amount of the silicate gel and hydraulic calcium silicate colloid generated from the water glass is slow, resulting in a decrease in the production rate, and the silicate gel can be sufficiently generated in a short time by actively adding sodium silicate, which can be hydrolyzed into silicate gel, but if the hydraulic calcium silicate colloid cannot be produced by adding only sodium silicate, the strength of the recycled coarse aggregate is decreased; the silicic acid gel forms a hydrophobic film, the surface roughness of the regenerated coarse aggregate can be reduced, the occlusion degree of the regenerated coarse aggregate and cement is reduced, the nano silicon carbide can be adhered to the surface of the hydrophobic film, the roughness of the regenerated coarse aggregate is increased, the hardness and the mechanical strength of the nano silicon carbide are high, the expansion coefficient is small, the performance of the regenerated coarse aggregate can be well increased, the nano silicon carbide can enable the size of the silicic acid gel generated by the water glass to be smaller, and pores or cracks of the regenerated coarse aggregate can be easily blocked; 3-chloropropyltriethoxysilane can improve the compressive strength of water glass, thereby better improving the strength of the recycled coarse aggregate.
Preferably, the mass ratio of the water glass, the sodium silicate and the nano silicon carbide is 4-8:1-3:1-2.
By adopting the technical scheme, the application provides the optimal mass ratio of the water glass, the sodium silicate and the nano silicon carbide so as to improve the strength of the regenerated coarse aggregate to the greatest extent.
Preferably, the modification solution comprises the following raw materials in parts by weight: 2-4 parts of nano filler, 0.2-0.3 part of dispersing agent, 0.2-0.3 part of titanate coupling agent and 90-100 parts of water, wherein the nano filler comprises one or more of nano silicon dioxide, nano calcium carbonate and graphene oxide.
By adopting the technical scheme, the graphene oxide enables the microstructure of the recycled coarse aggregate to be refined, and the micromechanical property of the interface transition zone is improved, so that the calcium content in the recycled coarse aggregate is increased, the nano calcium carbonate can also improve the strength of the interface transition zone of the recycled coarse aggregate, and the calcium carbonate is actively added, so that the calcium content of the recycled coarse aggregate is improved, the reaction rate with water glass can be improved, the production efficiency is improved, the nano silicon dioxide can preliminarily fill fine gaps of the recycled coarse aggregate in one step, the situation that gel generated by the water glass is not sufficiently filled in the recycled coarse aggregate is avoided, the nano silicon dioxide and the nano calcium carbonate can generate a synergistic effect, the freezing resistance and the corrosion resistance of the recycled coarse aggregate are improved, and the service life of concrete prepared from the recycled coarse aggregate is prolonged.
Preferably, the mass ratio of the nano silicon dioxide, the nano calcium carbonate and the graphene oxide is 4-8:2-4:1-2.
By adopting the technical scheme, the optimal proportion of the nano silicon dioxide, the nano calcium carbonate and the graphene oxide is improved to the greatest extent, so that the strength of the regenerated coarse aggregate is improved.
Preferably, the dispersant is one or more of a dispersant SP-830 and sodium hexametaphosphate, and the titanate coupling agent is one or more of a titanate coupling agent TCA-K38S, a titanate coupling agent TCA-K12 and a titanate coupling agent TCA-KTTT.
By adopting the technical scheme, the dispersing agent SP-830 can generate a synergistic effect with the titanate coupling agent, the dispersing agent SP-830 can better act on nano silicon dioxide and nano calcium carbonate, sodium hexametaphosphate also has better dispersion performance, the titanate coupling agent TCA-K38S, the titanate coupling agent TCA-K12 and the titanate coupling agent TCA-KTTT can carry out surface modification on nano calcium oxide and graphene oxide, the dispersion performance and the flow performance are improved, phosphate esters are contained in the titanate coupling agent TCA-K38S and the titanate coupling agent TCA-K12, the nano calcium carbonate can be wrapped, long-chain alkyl is arranged outwards, the nano calcium oxide is made to be hydrophobic, and the water absorption of the recycled coarse aggregate is reduced.
Preferably, the steel balls are added during grinding of the broken blocks in the step 2, the filling rate of the steel balls is 15-20%, and the ball-to-material ratio is 3-5.
Through adopting above-mentioned technical scheme, the mortar on regeneration coarse aggregate surface that can better detach is added to the steel ball when grinding, fully grind regeneration coarse aggregate, but the filling rate and the ball material ratio of steel ball are different, impact action to regeneration coarse aggregate is then different, too high impact force can cause the damage to regeneration coarse aggregate, increase the crack of regeneration coarse aggregate, be unfavorable for the improvement of regeneration coarse aggregate intensity, and the filling rate and the ball material ratio of appropriate steel ball, can be fine grind regeneration coarse aggregate, effectively improve the intensity of regeneration coarse aggregate, so the filling rate and the ball material ratio of steel ball are proposed in this application, with the intensity of furthest improvement regeneration coarse aggregate.
Preferably, in the step 2, the screened recycled coarse aggregate is washed by clean water and is repeated for three times, and then is dried at the temperature of 110-130 ℃ for 1-2 hours.
By adopting the technical scheme, as the ground recycled coarse aggregate is washed, impurities on the surface of the recycled coarse aggregate can be removed, the quality of the recycled coarse aggregate is improved, and the strength of the recycled coarse aggregate is effectively improved.
Preferably, after the regenerated coarse aggregate is washed, the regenerated coarse aggregate is firstly soaked in a calcium hydroxide solution, the concentration of the calcium hydroxide solution is 5-8%, the time is 2-3h, and drying treatment is carried out after soaking.
By adopting the technical scheme, the cleaned recycled coarse aggregate is soaked in the calcium hydroxide solution, and the calcium hydroxide solution can increase the adhesion of the recycled coarse aggregate to chemical substances, so that the substances in the subsequent steps can better act on the recycled coarse aggregate, and the strength of the recycled coarse aggregate is further improved.
In summary, the present application has the following beneficial effects:
1. the recycled aggregate is heated and ground firstly, mortar attached to the surfaces of fragments is effectively removed, gaps of the recycled coarse aggregate are filled through the modification solution, so that the strength of the recycled coarse aggregate is further improved, and then the mortar on the surfaces of the recycled coarse aggregate is subjected to reinforced modification through the reinforcement solution, and the strength of the recycled coarse aggregate is further improved.
2. According to the method, preferably, water glass, sodium silicate and nano silicon carbide are adopted as fillers of the reinforcing liquid, the water glass can improve the density and strength of the regenerated coarse aggregate, the silicic acid gel can be coated with mortar to form a hydrophobic membrane, the water absorption rate is reduced, the sodium silicate is added, the sodium silicate can be hydrolyzed into the silicic acid gel, enough silicic acid gel can be generated in a short time, the speed is accelerated, the nano silicon carbide can be adhered to the surface of the hydrophobic membrane, the roughness of the regenerated coarse aggregate is increased, the hardness and the mechanical strength of the regenerated coarse aggregate are improved, and the nano silicon carbide can enable the size of the silicic acid gel generated by the water glass to be smaller, so that pores or cracks of the regenerated coarse aggregate are blocked more easily.
3. In the application, nano silicon dioxide, nano calcium carbonate and graphene oxide are preferably adopted as fillers of the modified solution, and the graphene oxide improves the micromechanical property of an interface transition zone, so that the calcium content in the recycled coarse aggregate is increased, the nano calcium carbonate can also improve the strength of the interface transition zone of the recycled coarse aggregate, the reaction rate with water glass can be improved, the production efficiency is improved, the nano silicon dioxide and the nano calcium carbonate can generate a synergistic effect, the freezing resistance and the corrosion resistance of the recycled coarse aggregate are improved, and the service life of concrete prepared from the recycled coarse aggregate is prolonged.
Detailed Description
Preparation examples
Preparation example 1
The preparation of the modified solution comprises the following steps:
adding 0.114kg of nano silicon dioxide, 0.057kg of nano calcium carbonate, 0.029kg of graphene oxide, 0.02kg of dispersing agent SP-830, 0.02kg of titanate coupling agent TCA-K12 and 9.76kg of water into an ultrasonic stirrer for ultrasonic dispersion for 20min to prepare a modified solution, wherein the concentration of the nano filler in the modified solution is 2%.
Preparation example 2
The preparation 2 differs from the preparation 1 in that: 0.089kg of nano-silica, 0.089kg of nano-calcium carbonate, 0.022kg of graphene oxide, 0.02kg of dispersing agent SP-830, 0.02kg of titanate coupling agent TCA-K12 and 9.76kg of water are added into an ultrasonic disperser for ultrasonic dispersion for 20min to prepare a modified solution, wherein the concentration of the nano-filler in the modified solution is 2%.
Preparation example 3
Preparation 3 differs from preparation 1 in that: adding 0.1kg of nano silicon dioxide, 0.075kg of nano calcium carbonate, 0.025kg of graphene oxide, 0.02kg of dispersing agent SP-830, 0.02kg of titanate coupling agent TCA-K12 and 9.76kg of water into an ultrasonic stirrer for ultrasonic dispersion for 10min to prepare a modified solution, wherein the concentration of the nano filler in the modified solution is 2%.
Preparation example 4
Preparation 4 differs from preparation 1 in that: adding 0.133kg of nano silicon dioxide, 0.05kg of nano calcium carbonate, 0.017kg of graphene oxide, 0.02kg of dispersing agent SP-830, 0.02kg of titanate coupling agent TCA-K12 and 9.76kg of water into an ultrasonic stirrer for ultrasonic dispersion for 10min to prepare a modified solution, wherein the concentration of the nano filler in the modified solution is 2%.
Preparation example 5
The difference between preparation 5 and preparation 1 is that: adding 0.12kg of nano silicon dioxide, 0.06kg of nano calcium carbonate, 0.02kg of graphene oxide, 0.02kg of dispersing agent SP-830, 0.02kg of titanate coupling agent TCA-K12 and 9.76kg of water into an ultrasonic stirrer for ultrasonic dispersion for 10min to prepare a modified solution, wherein the concentration of the nano filler in the modified solution is 2%.
Preparation example 6
The difference between preparation 6 and preparation 1 is that: 0.109kg of nano-silica, 0.055kg of nano-calcium carbonate, 0.036kg of graphene oxide, 0.02kg of dispersing agent SP-830, 0.02kg of titanate coupling agent TCA-K12 and 9.76kg of water are added into an ultrasonic stirrer for ultrasonic dispersion for 10min to prepare a modified solution, wherein the concentration of the nano-filler in the modified solution is 2%.
Preparation example 7
Preparation 7 differs from preparation 1 in that: adding 0.218kg of nano silicon dioxide, 0.109kg of nano calcium carbonate, 0.073kg of graphene oxide, 0.02kg of dispersing agent SP-830, 0.02kg of titanate coupling agent TCA-K12 and 9.56kg of water into an ultrasonic stirrer for ultrasonic dispersion for 10min to prepare a modified solution, wherein the concentration of the nano filler in the modified solution is 4%.
Preparation example 8
Preparation 8 differs from preparation 1 in that: 0.164kg of nano silicon dioxide, 0.082kg of nano calcium carbonate, 0.054kg of graphene oxide, 0.02kg of dispersant SP-830, 0.02kg of titanate coupling agent TCA-K12 and 9.66kg of water are added into an ultrasonic stirrer for ultrasonic dispersion for 10min to prepare a modified solution, wherein the concentration of the nano filler in the modified solution is 3%.
Preparation example 9
The preparation of the strengthening liquid comprises the following steps:
adding 0.26kg of water glass, 0.067kg of sodium silicate, 0.067kg of nano silicon carbide, 0.05kg of 3-chloropropyltriethoxysilane and 9.55kg of water into a stirrer, mixing and stirring at the rotating speed of 400r/min for 10min to prepare a strengthening liquid, wherein the concentration of the filler in the strengthening liquid is 4%.
Preparation example 10
The difference between preparation 10 and preparation 9 is that: adding 0.2kg of water glass, 0.15kg of sodium silicate, 0.05kg of nano silicon carbide, 0.05kg of 3-chloropropyltriethoxysilane and 9.55kg of water into a stirrer, mixing and stirring at the rotating speed of 400r/min for 10min to prepare a strengthening liquid, wherein the concentration of a filler in the strengthening liquid is 4%.
Preparation example 11
Preparation 11 differs from preparation 9 in that: adding 0.229kg of water glass, 0.114kg of sodium silicate, 0.057kg of nano silicon carbide, 0.05kg of 3-chloropropyltriethoxysilane and 9.55kg of water into a stirrer, mixing and stirring at the rotating speed of 400r/min for 10min to prepare the strengthening liquid, wherein the concentration of the filler in the strengthening liquid is 4%.
Preparation example 12
Preparation 12 differs from preparation 9 in that: 0.291kg of water glass, 0.073kg of sodium silicate, 0.036kg of nano silicon carbide, 0.05kg of 3-chloropropyltriethoxysilane and 9.55kg of water are added into a stirrer to be mixed and stirred at the rotating speed of 400r/min for 10min to prepare the strengthening liquid, wherein the concentration of the filler in the strengthening liquid is 4%.
Preparation example 13
Preparation 13 differs from preparation 9 in that: 0.267kg of water glass, 0.089kg of sodium silicate, 0.044kg of nano silicon carbide, 0.05kg of 3-chloropropyltriethoxysilane and 9.55kg of water are added into a stirrer to be mixed and stirred at the rotating speed of 400r/min for 10min to prepare the strengthening liquid, wherein the concentration of the filler in the strengthening liquid is 4%.
Preparation example 14
The difference between preparation 14 and preparation 9 is that: 0.24kg of water glass, 0.08kg of sodium silicate, 0.08kg of nano silicon carbide, 0.05kg of 3-chloropropyltriethoxysilane and 9.55kg of water are added into a stirrer to be mixed and stirred at the rotating speed of 400r/min for 10min to prepare the strengthening liquid, wherein the concentration of the filler in the strengthening liquid is 4%.
Preparation example 15
The difference between preparation 15 and preparation 9 is that: adding 0.48kg of water glass, 0.16kg of sodium silicate, 0.16kg of nano silicon carbide, 0.05kg of 3-chloropropyltriethoxysilane and 9.15kg of water into a stirrer, mixing and stirring at the rotating speed of 400r/min for 10min to prepare the strengthening liquid, wherein the concentration of the filler in the strengthening liquid is 8%.
Preparation example 16
Preparation 16 differs from preparation 9 in that: 0.36kg of water glass, 0.12kg of sodium silicate, 0.12kg of nano silicon carbide, 0.05kg of 3-chloropropyltriethoxysilane and 9.35kg of water are added into a stirrer to be mixed and stirred at the rotating speed of 400r/min for 10min to prepare the strengthening liquid, wherein the concentration of the filler in the strengthening liquid is 6%.
Preparation example 17
Preparation 17 differs from preparation 9 in that: 0.134kg of water glass, 0.033kg of sodium silicate, 0.033kg of nano silicon carbide, 0.05kg of 3-chloropropyltriethoxysilane and 9.75kg of water are added into a stirrer to be mixed and stirred at the rotating speed of 400r/min for 10min to prepare a strengthening liquid, wherein the concentration of the filler in the strengthening liquid is 2%.
Preparation example 18
The difference between preparation 18 and preparation 9 is that: adding 0.666kg of water glass, 0.167kg of sodium silicate, 0.167kg of nano silicon carbide, 0.05kg of 3-chloropropyltriethoxysilane and 8.95kg of water into a stirrer, mixing and stirring at the rotating speed of 400r/min for 10min to prepare the strengthening liquid, wherein the concentration of the filler in the strengthening liquid is 10%.
Examples
Example 1
The environment-friendly regeneration, recovery and disposal method of the cement blocks is characterized by comprising the following steps:
step 1: taking the screened cement blocks, adding the cement blocks into a crusher for crushing treatment, so that the cement blocks are crushed to be less than 50mm in particle size, and preparing fragments;
step 2: putting the fragments into a heating device, introducing air at 300 ℃ for heating for 1h, then grinding for 15min, screening by a vibration screening machine after grinding, and screening out regenerated coarse aggregate, regenerated fine aggregate and powder;
and 3, step 3: soaking 1kg of recycled coarse aggregate in 10kg of the modified solution prepared in preparation example 1, adding the mixture into a stirrer, continuously stirring at the rotating speed of 400r/min for 1h, then placing the mixture into a dryer, and drying the mixture at 120 ℃ for 3h to prepare filled modified recycled coarse aggregate;
step 4: adding 10kg of the reinforcing liquid prepared in the preparation example 9 into a heating stirrer, heating to 200 ℃, then soaking the filling modified recycled coarse aggregate into the reinforcing liquid, continuously stirring at the rotating speed of 400r/min for 2 hours, then drying at the temperature of 120 ℃ for 3 hours to prepare the reinforcing recycled coarse aggregate, and finishing the recycling of the cement blocks.
Example 2
Example 2 differs from example 1 in that: and (3) changing the air introduced at 300 ℃ in the step (2) into the air introduced at 350 ℃.
Example 3
Example 3 differs from example 1 in that: changing the air introduced at 300 ℃ in the step 2 into the air introduced at 450 ℃.
Example 4
Example 4 differs from example 1 in that: changing the air introduced at 300 ℃ in the step 2 into the air introduced at 400 ℃.
Example 4
Example 4 differs from example 1 in that: and (3) changing the air at 300 ℃ into the air at 400 ℃ in the step (2), and changing the grinding time from 15min to 20min.
Example 5
Example 5 differs from example 1 in that: and (3) changing the air with the temperature of 300 ℃ into the air with the temperature of 400 ℃ in the step (2), and changing the grinding time from 15min to 25min.
Example 6
Example 6 differs from example 1 in that: changing the air introduced at 300 ℃ in the step 2 into the air introduced at 400 ℃, and changing the grinding time from 15min to 25min; the modified solution in preparation example 1 in step 3 was changed to the modified solution in preparation example 2.
Example 7
Example 7 differs from example 1 in that: changing the air introduced at 300 ℃ in the step 2 into the air introduced at 400 ℃, and changing the grinding time from 15min to 25min; the modified solution in preparation example 1 in step 3 was changed to the modified solution in preparation example 3.
Example 8
Example 8 differs from example 1 in that: changing the air introduced at 300 ℃ in the step 2 into the air introduced at 400 ℃, and changing the grinding time from 15min to 25min; the modified solution in preparation example 1 in step 3 was changed to the modified solution in preparation example 4.
Example 9
Example 9 differs from example 1 in that: changing the air introduced at 300 ℃ in the step 2 into the air introduced at 400 ℃, and changing the grinding time from 15min to 25min; the modification solution in preparation example 1 in step 3 was changed to the modification solution in preparation example 5.
Example 10
Example 10 differs from example 1 in that: changing the air introduced at 300 ℃ in the step 2 into the air introduced at 400 ℃, and changing the grinding time from 15min to 25min; the modifying solution in preparation example 1 in step 3 was changed to the modifying solution in preparation example 6.
Example 11
Example 11 differs from example 1 in that: changing the air introduced at 300 ℃ in the step 2 into the air introduced at 400 ℃, and changing the grinding time from 15min to 25min; the modifying solution in preparation example 1 in step 3 was changed to the modifying solution in preparation example 7.
Example 12
Example 12 differs from example 1 in that: changing the air introduced at 300 ℃ in the step 2 into the air introduced at 400 ℃, and changing the grinding time from 15min to 25min; the modified solution in preparation example 1 in step 3 was changed to the modified solution in preparation example 8.
Example 13
Example 13 differs from example 1 in that: changing the air introduced at 300 ℃ in the step 2 into the air introduced at 400 ℃, and changing the grinding time from 15min to 25min; the modified solution in preparation example 1 in step 3 was changed to the modified solution in preparation example 8; the reinforcing liquid in preparation example 9 in step 4 was changed to the reinforcing liquid in preparation example 10.
Example 14
Example 14 differs from example 1 in that: changing the air introduced at 300 ℃ in the step 2 into the air introduced at 400 ℃, and changing the grinding time from 15min to 25min; the modified solution in preparation example 1 in step 3 was changed to the modified solution in preparation example 8; the reinforcing liquid in preparation example 9 in step 4 was changed to the reinforcing liquid in preparation example 11.
Example 15
Example 15 differs from example 1 in that: changing the air introduced at 300 ℃ in the step 2 into the air introduced at 400 ℃, and changing the grinding time from 15min to 25min; the modified solution in preparation example 1 in step 3 was changed to the modified solution in preparation example 8; the strengthening liquid in preparation example 9 in step 4 was changed to the strengthening liquid in preparation example 12.
Example 16
Example 16 differs from example 1 in that: changing the air introduced at 300 ℃ in the step 2 into the air introduced at 400 ℃, and changing the grinding time from 15min to 25min; the modified solution in preparation example 1 in step 3 was changed to the modified solution in preparation example 8; the reinforcing liquid in preparation example 9 in step 4 was changed to the reinforcing liquid in preparation example 13.
Example 17
Example 17 differs from example 1 in that: changing the air introduced at 300 ℃ in the step 2 into the air introduced at 400 ℃, and changing the grinding time from 15min to 25min; the modified solution in preparation example 1 in step 3 was changed to the modified solution in preparation example 8; the strengthening liquid in preparation example 9 in step 4 was changed to the strengthening liquid in preparation example 14.
Example 18
Example 18 differs from example 1 in that: changing the air introduced at 300 ℃ in the step 2 into the air introduced at 400 ℃, and changing the grinding time from 15min to 25min; the modified solution in preparation example 1 in step 3 was changed to the modified solution in preparation example 8; the strengthening liquid in preparation example 9 in step 4 was changed to the strengthening liquid in preparation example 15.
Example 19
Example 19 differs from example 1 in that: changing the air introduced at 300 ℃ in the step 2 into the air introduced at 400 ℃, and changing the grinding time from 15min to 25min; the modified solution in preparation example 1 in step 3 was changed to the modified solution in preparation example 8; the reinforcing liquid in preparation example 9 in step 4 was changed to the reinforcing liquid in preparation example 16.
Example 20
Example 20 differs from example 1 in that: changing the air introduced at 300 ℃ in the step 2 into the air introduced at 400 ℃, and changing the grinding time from 15min to 25min; the modified solution in preparation example 1 in step 3 was changed to the modified solution in preparation example 8; the strengthening solution in preparation example 9 in the step 4 is changed into the strengthening solution in preparation example 16, and the time is changed from 2h to 6h.
Example 21
Example 21 differs from example 1 in that: changing the air introduced at 300 ℃ in the step 2 into the air introduced at 400 ℃, and changing the grinding time from 15min to 25min; the modified solution in preparation example 1 in step 3 was changed to the modified solution in preparation example 8; the strengthening solution in preparation example 9 in the step 4 is changed into the strengthening solution in preparation example 16, and the time is changed from 2h to 4h.
Example 22
Example 22 differs from example 1 in that:
step 1: taking the screened cement blocks, adding the cement blocks into a crusher for crushing treatment, and crushing the cement blocks until the particle size is less than 50mm to obtain crushed blocks;
step 2: putting the fragments into a heating device, introducing air at 400 ℃ for heating for 1h, then grinding, adding steel balls during grinding, wherein the filling rate of the steel balls is 15%, the ball-to-material ratio is 4;
and step 3: soaking 1kg of recycled coarse aggregate in 10kg of the modified solution prepared in preparation example 8, adding the mixture into a stirrer, continuously stirring at the rotating speed of 400r/min for 1h, then placing the mixture into a dryer, and drying the mixture at 120 ℃ for 3h to prepare filled modified recycled coarse aggregate;
step 4: 10kg of the reinforcing liquid in the preparation example 16 is added into a heating stirrer, heated to 200 ℃, then the filling modified recycled coarse aggregate is soaked in the reinforcing liquid, and continuously stirred at the rotating speed of 400r/min for 4 hours, and then dried at 120 ℃ for 3 hours to prepare the reinforcing recycled coarse aggregate, thus completing the recycling treatment of the cement blocks.
Example 23
Example 23 differs from example 1 in that:
step 1: taking the screened cement blocks, adding the cement blocks into a crusher for crushing treatment, so that the cement blocks are crushed to be less than 50mm in particle size, and preparing fragments;
and 2, step: putting the fragments into a heating device, introducing air at 400 ℃ for heating for 1h, then grinding, adding steel balls during grinding, wherein the filling rate of the steel balls is 15%, the ball-to-material ratio is 4;
and step 3: soaking 1kg of recycled coarse aggregate in 10kg of the modified solution prepared in preparation example 8, adding the mixture into a stirrer, continuously stirring at the rotating speed of 400r/min for 1h, then placing the mixture into a dryer, and drying the mixture at 120 ℃ for 3h to prepare filled modified recycled coarse aggregate;
step 4: adding 10kg of the reinforcing liquid prepared in the preparation example 16 into a heating stirrer, heating to 200 ℃, then soaking the filling modified recycled coarse aggregate into the reinforcing liquid, continuously stirring at the rotating speed of 400r/min for 4h, drying at the temperature of 120 ℃ for 3h to prepare the reinforcing recycled coarse aggregate, and finishing the recycling of cement blocks.
Example 24
Example 24 differs from example 1 in that:
step 1: taking the screened cement blocks, adding the cement blocks into a crusher for crushing treatment, so that the cement blocks are crushed to be less than 50mm in particle size, and preparing fragments;
step 2: putting the fragments into a heating device, introducing air at 400 ℃ for heating for 1 hour, then grinding, adding steel balls during grinding, wherein the filling rate of the steel balls is 15%, the ball-to-material ratio is 4, the time is 25min, screening by a vibration screening machine after grinding, screening out regenerated coarse aggregate, regenerated fine aggregate and powder, washing the regenerated coarse aggregate with clear water, repeating the washing for three times, then soaking the washed regenerated coarse aggregate into a calcium hydroxide solution, wherein the concentration of the calcium hydroxide solution is 5%, the time is 2 hours, and then drying at 130 ℃ for 2 hours;
and 3, step 3: soaking 1kg of recycled coarse aggregate in 10kg of the modified solution prepared in preparation example 8, adding the mixture into a stirrer, continuously stirring at the rotating speed of 400r/min for 1h, then placing the mixture into a dryer, and drying the mixture at 120 ℃ for 3h to prepare filled modified recycled coarse aggregate;
step 4: 10kg of the reinforcing liquid in the preparation example 16 is added into a heating stirrer, heated to 200 ℃, then the filling modified recycled coarse aggregate is soaked in the reinforcing liquid, and continuously stirred at the rotating speed of 400r/min for 4 hours, and then dried at 120 ℃ for 3 hours to prepare the reinforcing recycled coarse aggregate, thus completing the recycling treatment of the cement blocks.
Comparative example
Comparative example 1
Comparative example 1 differs from example 1 in that: and (3) introducing air at the temperature of 500 ℃ instead of introducing air at the temperature of 300 ℃ in the step 2.
Comparative example 2
Comparative example 2 differs from example 1 in that: the grinding time in the step 2 is changed from 15min to 30min.
Comparative example 3
Comparative example 3 differs from example 1 in that: the reinforcing liquid in preparation example 9 in step 4 was changed to the reinforcing liquid in preparation example 17.
Comparative example 4
Comparative example 4 differs from example 1 in that: the strengthening liquid in preparation example 9 in step 4 was changed to the strengthening liquid in preparation example 18.
Performance test
1. Water absorption: apparent densities of examples 1 to 24 and comparative examples 1 to 4 were measured in accordance with GB/T14685-2011 construction pebbles and gravels.
2. Apparent density: apparent densities of examples 1 to 24 and comparative examples 1 to 4 were measured in accordance with GB/T25177-2010 recycled coarse aggregate for concrete.
3. Crush value: apparent densities of examples 1 to 24 and comparative examples 1 to 4 were measured in accordance with GB/T25177-2010 recycled coarse aggregate for concrete.
4. Porosity: apparent densities of examples 1 to 24 and comparative examples 1 to 4 were measured in accordance with GB/T25177-2010 recycled coarse aggregate for concrete.
TABLE 1 Performance test of examples 1-5 and comparative examples 1-2
Figure BDA0003777179730000121
Table 2 performance testing of examples 6-12
Figure BDA0003777179730000122
TABLE 3 Performance test of examples 13 to 19 and comparative examples 3 to 4
Figure BDA0003777179730000131
TABLE 4 Performance testing of examples 20-24
Figure BDA0003777179730000132
It can be seen from the combination of examples 1 to 5 and comparative examples 1 to 2 and table 1 that, when the heating temperature to the crumb is different, the grinding effect is different, if the temperature is too low, the slurry on the surface of the recycled coarse aggregate cannot be removed well, if the temperature is too high, the crack of the recycled coarse aggregate is increased, and the grinding time also affects the performance of the recycled coarse aggregate, and when the grinding time reaches a certain value, the performance of the recycled coarse aggregate is not improved significantly, or even has a slight decline tendency, and the recycled coarse aggregate in example 5 has better performance in combination with comprehensive consideration.
As can be seen from the combination of examples 6 to 12 and table 2, when the mass ratios of the nano-silica nano-calcium carbonate and the graphene oxide are different, the influence on the water absorption rate, the apparent density, the crushing value and the porosity of the recycled coarse aggregate is different, and when the total amount of the nano-silica nano-calcium carbonate and the graphene oxide is different, the influence on the water absorption rate, the apparent density, the crushing value and the porosity of the recycled coarse aggregate is different, and the recycled coarse aggregate in example 12 has better performance in combination with comprehensive consideration.
It can be seen from the combination of examples 13 to 19 and comparative examples 3 to 4 and table 3 that when the addition ratios of water glass, sodium silicate and nano silicon carbide are different, the influences on the water absorption, apparent density, crushing value and porosity of the recycled coarse aggregate are different, and when the total amount of water glass, sodium silicate and nano silicon carbide is different, the influences on the water absorption, apparent density, crushing value and porosity of the recycled coarse aggregate are different, when the addition amounts of water glass, sodium silicate and nano silicon carbide are too small, the gap of the recycled coarse aggregate cannot be well filled and the surface slurry cannot be well modified and strengthened, and when the addition amounts of water glass, sodium silicate and nano silicon carbide are too large, the gel on the surface of the recycled coarse aggregate is too much, so that the strength of the recycled coarse aggregate is reduced, and the performance of the recycled coarse aggregate in example 19 is better in combination with comprehensive consideration.
It can be seen by combining examples 20-24 and table 2 that the compound use of water glass, sodium silicate, and nano silicon carbide can reduce the modification time of the strengthening liquid to the recycled coarse aggregate, and improve the production rate, and the steel ball is added during grinding, and the filling rate and ball-to-material ratio of the steel ball are controlled, so that the recycled coarse aggregate can be well ground to better absorb the chemical additives, and after grinding, the recycled coarse aggregate can be washed with water, so that the surface impurities can be well removed, and the performance of the recycled coarse aggregate can be further improved, and after washing, the recycled coarse aggregate can be further improved in the adhesion rate of the chemical agents thereon by soaking in a calcium hydroxide solution, and the performance thereof can be improved, and the performance of example 24 is optimal in combination with comprehensive consideration.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (5)

1. The environment-friendly regeneration, recovery and disposal method of the cement blocks is characterized by comprising the following steps:
step 1: adding the cement blocks into a crusher for crushing treatment to prepare fragments;
step 2: putting the fragments into a heating device, introducing air at 250-450 ℃ for heating for 1-1.5h, then grinding for 15-25min, and screening after grinding to obtain regenerated coarse aggregate;
and 3, step 3: soaking the recycled coarse aggregate in the modified solution, continuously stirring for 1-2h, and then drying at 100-120 ℃ for 2-3h to prepare the filling modified recycled coarse aggregate;
step 4: soaking the filling modified recycled coarse aggregate in a strengthening solution, heating to 180-200 ℃, continuously stirring for 2-6h, then drying at 100-120 ℃ for 2-3h to prepare the strengthened recycled coarse aggregate, and completing the recycling treatment of the cement blocks;
the strengthening liquid comprises the following raw materials in parts by weight: 4-10 parts of filler, 0.5-1 part of 3-chloropropyltriethoxysilane and 90-100 parts of water, wherein the filler comprises water glass, sodium silicate and nano silicon carbide;
the mass ratio of the water glass to the sodium silicate to the nano silicon carbide is 4-8:1-3:1-2;
the modified solution comprises the following raw materials in parts by weight: 2-4 parts of nano filler, 0.2-0.3 part of dispersing agent, 0.2-0.3 part of titanate coupling agent and 90-100 parts of water, wherein the nano filler comprises nano silicon dioxide, nano calcium carbonate and graphene oxide;
the mass ratio of the nano silicon dioxide to the nano calcium carbonate to the graphene oxide is (4-8): 2-4:1-2.
2. The method of claim 1, wherein the method comprises: the dispersing agent is one or more of dispersing agent SP-830 and sodium hexametaphosphate, and the titanate coupling agent is one or more of titanate coupling agent TCA-K38S, titanate coupling agent TCA-K12 and titanate coupling agent TCA-KTTT.
3. The method of claim 1, wherein the method comprises: adding steel balls during grinding of the broken blocks in the step 2, wherein the filling rate of the steel balls is 15-20%, and the ball-material ratio is 3-5.
4. The method of claim 1, wherein the method comprises: in the step 2, the screened recycled coarse aggregate is washed by clear water and is repeated for three times, and then is dried at the temperature of 110-130 ℃ for 1-2 hours.
5. The method of claim 4, wherein the cement clinker is recycled and disposed in an environmentally friendly manner, and the method comprises: after the regenerated coarse aggregate is washed, the regenerated coarse aggregate is firstly soaked in a calcium hydroxide solution, the concentration of the calcium hydroxide solution is 5-8%, the time is 2-3h, and drying treatment is carried out after the soaking.
CN202210919733.XA 2022-08-02 2022-08-02 Environment-friendly regeneration, recovery and disposal method of cement blocks Active CN115196901B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210919733.XA CN115196901B (en) 2022-08-02 2022-08-02 Environment-friendly regeneration, recovery and disposal method of cement blocks

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210919733.XA CN115196901B (en) 2022-08-02 2022-08-02 Environment-friendly regeneration, recovery and disposal method of cement blocks

Publications (2)

Publication Number Publication Date
CN115196901A CN115196901A (en) 2022-10-18
CN115196901B true CN115196901B (en) 2023-04-07

Family

ID=83586508

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210919733.XA Active CN115196901B (en) 2022-08-02 2022-08-02 Environment-friendly regeneration, recovery and disposal method of cement blocks

Country Status (1)

Country Link
CN (1) CN115196901B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117164317B (en) * 2023-08-16 2024-03-01 中国建筑第二工程局有限公司 Recycled concrete and preparation method thereof

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106565121B (en) * 2016-10-19 2019-01-22 山西省交通科学研究院 A kind of waste and old cement concrete recycled aggregate surface treatment method
CN110105018B (en) * 2019-05-22 2021-09-17 郑州大学 Modified coarse aggregate, fiber nano recycled concrete prepared from modified coarse aggregate and preparation method of fiber nano recycled concrete
CN110818330A (en) * 2019-11-23 2020-02-21 青岛汇鑫混凝土有限公司 Recycled aggregate concrete and preparation method thereof
CN112645658A (en) * 2020-12-29 2021-04-13 南通友力混凝土有限公司 High-strength recycled concrete and production process thereof
CN112830724A (en) * 2021-01-15 2021-05-25 深圳市宝金华混凝土有限公司 Recycled concrete and preparation method thereof
CN113582570A (en) * 2021-06-01 2021-11-02 河北工程大学 Method for repeatedly strengthening recycled concrete aggregate
CN113354369B (en) * 2021-07-23 2022-07-12 成都志达商品混凝土厂 High-strength recycled concrete and preparation method thereof
CN114315199A (en) * 2022-01-18 2022-04-12 河北长力环保科技有限公司 Preparation method for producing sandstone aggregate from construction waste

Also Published As

Publication number Publication date
CN115196901A (en) 2022-10-18

Similar Documents

Publication Publication Date Title
CN110104997A (en) A kind of regeneration concrete and its production technology
US8192542B2 (en) Aqueous suspension based on hydraulic binder and a process for the production thereof
CN107459311B (en) Preparation method of waste-utilizing, fracture-resisting and toughening wet-grinding slurry-like admixture
CN110395949A (en) A kind of heavy haul railway sleeper abrasion-proof concrete and preparation method thereof
CN102757208A (en) Size and method for treating recycled coarse aggregates
CN112430044A (en) Chlorine ion erosion resistant permeable recycled concrete and preparation method thereof
CN115196901B (en) Environment-friendly regeneration, recovery and disposal method of cement blocks
CN107352915B (en) A kind of high-performance fiber concrete of C110 strength grade and preparation method thereof
CN107512888B (en) A kind of high-performance fiber concrete of C140 strength grade and preparation method thereof
CN115073097B (en) High-strength recycled aggregate concrete and preparation method thereof
CN111747722A (en) Cement-based baking-free high-strength plate modified based on sodium silicate and preparation method thereof
CN109336456A (en) A kind of red mud base asphalt mixture warm-mixing agent and preparation method thereof
CN111548070B (en) Reinforced compact anticorrosive sprayed concrete
CN111875301A (en) Nano reinforcement method for recycled aggregate concrete and reinforced recycled aggregate obtained by nano reinforcement method
CN107344842A (en) A kind of good endurance Aggregate of recycled concrete aerated bricks and preparation method thereof
CN114230281A (en) Recycled concrete capable of reducing porosity and preparation method thereof
CN112777980B (en) Preparation method of waste glass fire-resistant high-strength concrete
CN114195447A (en) Iron scrap-hematite weight-allocated concrete and preparation method thereof
CN117800702A (en) Pavement rapid repair mortar of composite magnesium cement and alkali-activated slag and preparation method thereof
CN111704377B (en) Fiber-reinforced autoclaved aerated concrete block and production method thereof
CN115448659B (en) Solid waste stainless steel slag recycled concrete based on early carbonization and early dry-wet cycle coupling effect and preparation method thereof
CN116253543B (en) Concrete containing recycled concrete aggregate and wood fiber aggregate
CN114276091B (en) Method for preparing underwater undispersed concrete by using ceramic tile waste
CN115448647A (en) High-ductility regenerated powder geopolymer-based reinforced repair material and preparation method thereof
CN114656214A (en) Full-age carbon-bearing concrete precast pile and preparation method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant