CN115594446B - Preparation method of green concrete based on sludge and waste concrete - Google Patents
Preparation method of green concrete based on sludge and waste concrete Download PDFInfo
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- CN115594446B CN115594446B CN202211011655.XA CN202211011655A CN115594446B CN 115594446 B CN115594446 B CN 115594446B CN 202211011655 A CN202211011655 A CN 202211011655A CN 115594446 B CN115594446 B CN 115594446B
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- 239000004567 concrete Substances 0.000 title claims abstract description 124
- 239000010802 sludge Substances 0.000 title claims abstract description 89
- 239000002699 waste material Substances 0.000 title claims abstract description 72
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 69
- 229910001868 water Inorganic materials 0.000 claims description 69
- 238000003756 stirring Methods 0.000 claims description 51
- 239000000203 mixture Substances 0.000 claims description 29
- 239000004568 cement Substances 0.000 claims description 28
- 238000002156 mixing Methods 0.000 claims description 22
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 20
- 239000003638 chemical reducing agent Substances 0.000 claims description 18
- 238000005507 spraying Methods 0.000 claims description 16
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 11
- 239000000292 calcium oxide Substances 0.000 claims description 10
- 235000012255 calcium oxide Nutrition 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 10
- 238000012216 screening Methods 0.000 claims description 9
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 229910052622 kaolinite Inorganic materials 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 7
- 238000004064 recycling Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 2
- 238000007781 pre-processing Methods 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000013049 sediment Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 239000011376 self-consolidating concrete Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- -1 silt Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001877 deodorizing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005297 material degradation process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 1
- 235000019796 monopotassium phosphate Nutrition 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 description 1
- LWIHDJKSTIGBAC-UHFFFAOYSA-K potassium phosphate Substances [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/10—Lime cements or magnesium oxide cements
- C04B28/12—Hydraulic lime
-
- 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
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
-
- 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
- C04B18/0436—Dredged harbour or river sludge
-
- 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
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- 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)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Treatment Of Sludge (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a preparation method of green concrete based on sludge and waste concrete, which comprises the following steps: s1, preprocessing sludge; s2, crushing waste concrete; s3, treating the recycled fine aggregate; s4, treating the recycled coarse aggregate; and S5, preparing green concrete, wherein a large amount of waste concrete, river, lake and sea sludge and other building wastes are used as raw materials, so that a large amount of building wastes are consumed, the recycling of the building wastes is realized, the high energy consumption generated by the traditional method is reduced, and the method is a green recycling technology.
Description
Technical Field
The invention relates to the field of a preparation method of green concrete based on sludge and waste concrete. More particularly, the invention relates to a method for preparing green concrete based on sludge and waste concrete.
Background
Along with the large water content of the sludge, the components are complex, secondary pollution is easy to generate, and the incorrect disposal can cause adverse effects on the environment, so that the treatment and disposal of the sludge at the bottom of the dredging river become a general concern. The prior silt utilization technology mainly comprises solidified soil, sintered ceramsite, baking-free ceramsite, silt bricks, silt cement and the like, and the technology prospect of baking-free ceramsite is the most extensive. The current recycling path of the waste concrete is clear and mature, the waste concrete is removed, the waste concrete is subjected to on-site preliminary crushing and then is conveyed to a recycling plant of recycled crushed materials, coarse aggregate (broken stone) and powder (crushed sand and cement slurry) are obtained through fine crushing, wherein the coarse aggregate is doped into fresh concrete to prepare concrete, and the powder is doped into base materials to construct a base layer.
Chinese patent application publication No. CN 110156409A discloses a concrete containing silt and a preparation method thereof, cement, silt, fly ash, basalt crushed stone, river sand, polypropylene fiber and nano reinforcing agent are added into a concrete mixer to be mixed uniformly, then mixed liquid is added, and the concrete is prepared by uniformly mixing, wherein the strength is about 30-35 MPa. Chinese patent publication No. CN 103755267B discloses a silt concrete and a preparation method thereof, wherein the silt concrete comprises cement, water, cobble, fly ash, mineral powder, sand and an additive, and the final strength is about 35MPa by adopting silt to replace part of sand as fine aggregate. Chinese patent application publication No. CN 108558337A discloses a method for preparing organic active concrete by modifying sludge, which comprises the steps of deodorizing sludge, reacting with organic synthetic curing agent, and mixing the modified sludge, silicate cement, fly ash, etc. to obtain the organic active concrete. The concrete obtained by the 3 patent technologies has lower strength, less sludge participation, higher cost compared with common C30 concrete, lower added value and poor market competitiveness.
Chinese patent application publication No. 114436601a discloses a recycled aggregate self-compacting concrete and a preparation method thereof, wherein the recycled aggregate self-compacting concrete is prepared into aggregate particles after being crushed, sorted and sieved; uniformly mixing water glass, PVA, nano silicon dioxide, phosphoric acid and water to prepare a composite liquid, and placing aggregate particles into the composite liquid for soaking; placing the aggregate particles after the composite liquid is soaked in a closed container, vacuumizing, introducing carbon dioxide gas, boosting the pressure to 0.1-0.4MPa, and maintaining the pressure for 20-24 hours to prepare reinforced aggregate particles; the reinforced aggregate particles are soaked in the aqueous organic silicon resin emulsion, dried and finally stirred to form the self-compacting concrete, and the self-compacting concrete has the advantages of compact structure, high mechanical strength and strong freezing resistance. Chinese patent publication No. CN113024199B discloses a recycled concrete prepared from waste building concrete and a preparation method thereof, which comprises the following steps: 1) Crushing, cleaning and screening the waste building concrete to obtain recycled aggregate; 2) Mixing the recycled aggregate with magnesium sulfate, lithium carbonate, sodium sulfate and monopotassium phosphate to obtain a mixture; 3) The mixture is mixed with cementing materials, coarse aggregate, fine aggregate, additives, synergists and water to obtain the recycled concrete prepared from the waste building concrete, so that the anti-seepage performance of the concrete is improved, and meanwhile, the recycled concrete has better anti-cracking performance. The 2 patents have more materials and complicated manufacturing process, and do not get rid of the convention of treating coarse aggregate and fine aggregate differently, and the coarse aggregate is divided into three types of 20-30cm, 10-20cm and 5-10cm after sieving, and concrete with different grades is respectively added, and is generally not added into one concrete at the same time; the fine aggregate cannot be added into concrete, and is generally added into a base layer (which belongs to degradation use), so that a large amount of powder can only be used for low-grade buildings such as base layers, mortar and the like.
In short, the prior art has few cases of combining the river and lake sediment and the waste concrete, and does not realize the maximized green application of the construction wastes such as sludge, waste concrete and the like in the construction engineering and the highway engineering.
Disclosure of Invention
To achieve these objects and other advantages and in accordance with the purpose of the invention, a preferred embodiment of the invention provides a method for preparing green concrete based on sludge and waste concrete, comprising the steps of:
step S1, sludge pretreatment
Stirring the sludge and quicklime, standing, drying and grinding to obtain treated sludge, and dividing the treated sludge into two parts, namely a part A and a part B;
step S2, crushing the waste concrete
Removing sundries in the waste concrete, and crushing and screening the waste concrete to obtain recycled coarse aggregate and recycled fine aggregate;
step S3, treating the regenerated fine aggregate
Fully mixing the recycled fine aggregate obtained in the step S2, the A part of the sludge obtained in the pretreatment in the step S1 and metakaolin, and then mixing and stirring the mixture and water;
Step S4, treating the recycled coarse aggregate
Spraying water to the recycled coarse aggregate obtained in the step S2 to enable the recycled coarse aggregate to be in a saturated surface dry state;
Step S5, preparing green concrete
And (3) mixing and stirring the recycled coarse aggregate obtained in the step (S4), the part B of the recycled fine aggregate obtained in the step (S3), the sludge obtained in the step (S1), cement, water and a water reducing agent, and finally obtaining the target product green concrete.
Preferably, in the step S1, the sludge and the quicklime are stirred, and the mixture is left to stand, dried and ground, and the method specifically comprises the following operations:
Sieving the sludge, mixing and stirring the sieved sludge and quicklime according to the weight ratio of 100:6-16, standing and drying, and grinding to 0.08mm for later use after drying.
Preferably, in the step S2, impurities in the waste concrete are removed, and the waste concrete is crushed to obtain recycled coarse aggregate and recycled fine aggregate, which specifically comprises the following operations:
s21, primarily crushing the waste concrete, and cleaning sundries in the waste concrete;
s22, continuing secondary crushing to obtain a mixture with the diameter of less than 35 cm;
and S23, further screening the mixture obtained in the step S22 to obtain the recycled coarse aggregate and the recycled fine aggregate respectively.
Preferably, in the step S3, the recycled fine aggregate obtained in the step S2, the a portion of the sludge obtained by the pretreatment in the step S1, and the metakaolin are fully mixed, and then the mixture and the water are mixed and stirred, which specifically comprises the following operations:
Step S31, mixing the recycled fine aggregate obtained in the step S2, the sludge obtained in the pretreatment in the step S1 and metakaolin and cement according to the mass ratio of 100:5-10:0-5:2 to obtain a mixture;
And step S32, mixing and stirring the mixture and water according to the mass ratio of 100:1-4, wherein the water is added in a mode of spraying while stirring until the water is added, and curing for at least 7 days for later use.
Preferably, in the step S5, the recycled coarse aggregate obtained by the treatment in the step S4 of the part B, the recycled fine aggregate obtained by the treatment in the step S3, the sludge obtained by the treatment in the step S1, cement, water and a water reducing agent are mixed and stirred, and finally, the green concrete of the target product is obtained, which specifically comprises the following steps;
step S51, fully stirring the recycled coarse aggregate obtained in the step S4 and the recycled fine aggregate obtained in the step S3;
step S52, continuously adding the sludge obtained in the step S1, and fully stirring;
step S53, adding water and a water reducing agent, and fully stirring to finally obtain a target product green concrete;
Wherein, the weight ratio of the recycled coarse aggregate obtained by the treatment in the step S4 to the recycled fine aggregate obtained by the treatment in the step S3 to the sludge obtained by the treatment in the step S1 to the cement, the water and the water reducing agent is 65-75:190-200:20-30:90-110:35-40:2-4.
Preferably, the cement is an ultra-fine cement, wherein the median particle diameter D50 is less than 1um, the maximum particle diameter is not more than 18um, and more than 80% of the particle size is less than 5 um.
Preferably, the water reducer is an anti-mud type high-efficiency water reducer.
Preferably, the metakaolin is obtained by grinding kaolinite and calcining at 600-900 ℃ and has fineness of 4000-18000m 2/Kg.
Preferably, the weight ratio of the part a to the part B is 100: (50-200).
The invention at least comprises the following beneficial effects:
(1) The invention adopts a large amount of waste concrete, river, lake and sea sludge and other wastes as raw materials, consumes a large amount of construction waste, not only realizes the recycling of the construction waste, but also reduces the high energy consumption generated by the traditional method, is a green recycling technology, and the concrete disclosed by the invention can be used for rural cement concrete pavements, low-grade highways and non-institutional concrete, and has wide application prospect and considerable benefit.
(2) The invention solves the problems of low added value, high energy consumption, strong market competition and need of receiving downstream engineering existing in the traditional technology (such as ceramsite making, brick making and roadbed) in the technology of waste concrete fine aggregate and dredging sludge, and realizes the maximization of the value of the construction waste and obvious economic benefit.
(3) According to the invention, the expansion component in the sludge (if not, a small amount of calcined metakaolin is added), the regenerated fine aggregate is dry mixed and filled in the gaps of the fine aggregate, and the expansion of the expansion component in the gaps is realized in a small amount of sprinkling water mode to provide expansion force, so that the tight filling of the gaps of the fine aggregate is realized, and the problem of lower strength of the regenerated fine aggregate is effectively solved.
(4) The waste concrete is fully graded and utilized, so that the situation that fine aggregates are used for a base layer in the traditional utilization mode is avoided, and the repeated transportation cost and the added value loss of material degradation and use in the process are reduced.
(5) The concrete prepared by the method can consume about 40% of waste concrete and more than 5% of sludge under the condition that the strength of the concrete is not lower than 30MPa, and compared with the common C30 concrete, the method saves 45% of new materials.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The present invention is described in further detail below with reference to examples to enable those skilled in the art to practice the same by referring to the description.
The following description is presented to enable one of ordinary skill in the art to make and use the invention. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood that the terms "a" and "an" should be interpreted as referring to "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, while in another embodiment, the number of elements may be plural, and the term "a" should not be interpreted as limiting the number.
Example 1:
(1) Pretreatment of sludge:
filtering river, lake and sea dredging sediment by a 10cm screen, adding 6 parts of quicklime into 100 parts of sludge (with water weight), stirring, standing for 2 days, drying, grinding to below 0.08mm for later use, and dividing the sediment into two parts, namely a part A and a part B.
(2) Crushing waste concrete
1) Preliminary crushing is carried out on the waste concrete, and sundries such as reinforcing steel bars and the like are cleaned;
2) Carrying out secondary crushing on the waste concrete to obtain a mixture with the diameter of less than 35 cm;
3) And screening the mixture by adopting a 5mm square-hole screen to obtain the recycled coarse aggregate and the recycled fine aggregate respectively.
(3) Treatment of recycled fine aggregate
1) Mixing the recycled fine aggregate with the A part of the pretreated sludge obtained in the step (1) according to the fine aggregate: sludge: cement=100:10:2 ratio, thoroughly mixed;
2) Stirring the mixture and water according to the proportion of 100:3, adding the water in a spraying mode, stirring while spraying until the water is added, and curing for at least 7d for later use.
(4) Treatment of recycled coarse aggregate
Spraying water on the recycled coarse aggregate to make the recycled coarse aggregate in a saturated surface dry state.
(5) Preparation of green concrete
Stirring the recycled coarse aggregate, the common aggregate, the recycled fine aggregate in (4), the recycled fine aggregate in (3), the part B of the pretreated sludge in (1), cement, water and a water reducing agent according to the proportion of 65:210:190:20:110:35:3, fully stirring the recycled coarse aggregate, the common aggregate and the recycled fine aggregate for 1 minute during stirring, sequentially adding the sludge and the cement, stirring for 1 minute, and finally adding the water and the water reducing agent, and stirring for 3 minutes to obtain the green concrete containing the sludge and the full-graded waste concrete.
Finally, the green concrete containing the sludge and the full-graded waste concrete is prepared, the total weight of the full-graded waste concrete is about 40.3 percent, the absolute dry sludge is about 5.9 percent, and the compressive strength is about 39.5MPa.
Example 2:
(1) Pretreatment of sludge:
The river, lake and sea dredging sediment is filtered by a 10cm screen, 16 parts of quicklime is added to each 100 parts of sludge (containing water by weight), the mixture is stirred and then is left stand for 4 days, and the mixture is ground to be below 0.08mm for standby after being dried and is divided into two parts, namely a part A and a part B.
(2) Crushing waste concrete
1) Preliminary crushing is carried out on the waste concrete, and sundries such as reinforcing steel bars and the like are cleaned;
2) Carrying out secondary crushing on the waste concrete to obtain a mixture with the diameter of less than 35 cm;
3) And screening the mixture by adopting a 5mm square-hole screen to obtain the recycled coarse aggregate and the recycled fine aggregate respectively.
(3) Treatment of recycled fine aggregate
1) Mixing the recycled fine aggregate with the A part of the pretreated sludge obtained in the step (1) according to the fine aggregate: sludge: metakaolin: cement=100:5:5:2, thoroughly mixed;
2) Stirring the mixture and water according to the proportion of 100:2, adding the water in a spraying mode, stirring while spraying until the water is added, and curing for at least 7d for later use.
(4) Treatment of recycled coarse aggregate
Spraying water on the recycled coarse aggregate to make the recycled coarse aggregate in a saturated surface dry state.
(5) Preparation of green concrete
Stirring the recycled coarse aggregate, the common aggregate, the recycled fine aggregate in (4), the recycled fine aggregate in (3) and the part B of the pretreated sludge in (1), cement, water and a water reducing agent according to the proportion of 75:190:200:30:110:40:4, fully stirring the recycled coarse aggregate, the common aggregate and the recycled fine aggregate for 1 minute during stirring, sequentially adding the sludge and the cement, stirring for 1 minute, and finally adding the water and the water reducing agent, and stirring for 3 minutes to obtain the green concrete containing the sludge and the full-graded waste concrete.
Finally, the green concrete containing the sludge and the full-graded waste concrete is prepared, the total weight of the full-graded waste concrete is about 43.4 percent, the absolute dry sludge is about 7.6 percent, and the compressive strength is about 30.4MPa.
Example 3:
(1) Pretreatment of sludge:
Filtering river, lake and sea dredging sediment with 10cm sieve, adding 10 parts of quicklime into each 100 parts of sludge (with water weight), stirring, standing for 4 days, drying, grinding to below 0.08mm, and dividing into two parts, namely part A and part B.
(2) Crushing waste concrete
1) Preliminary crushing is carried out on the waste concrete, and sundries such as reinforcing steel bars and the like are cleaned;
2) Carrying out secondary crushing on the waste concrete to obtain a mixture with the diameter of less than 35 cm;
3) And screening the mixture by adopting a 5mm square-hole screen to obtain the recycled coarse aggregate and the recycled fine aggregate respectively.
(3) Treatment of recycled fine aggregate
1) Mixing the recycled fine aggregate with the A part of the pretreated sludge obtained in the step (1) according to the fine aggregate: sludge: metakaolin: cement=100:10:5:2 ratio;
2) Stirring the mixture and water according to the proportion of 100:3, adding the water in a spraying mode, stirring while spraying until the water is added, and curing for at least 7d for later use.
(4) Treatment of recycled coarse aggregate
Spraying water on the recycled coarse aggregate to make the recycled coarse aggregate in a saturated surface dry state.
(5) Preparation of green concrete
Stirring the recycled coarse aggregate, the common aggregate, the recycled fine aggregate in (4), the recycled fine aggregate in (3) and the part B of the pretreated sludge in (1), cement, water and a water reducing agent according to the proportion of 70:200:195:30:90:40:4, fully stirring the recycled coarse aggregate, the common aggregate and the recycled fine aggregate for 1 minute during stirring, sequentially adding the sludge and the cement, stirring for 1 minute, and finally adding the water and the water reducing agent, and stirring for 3 minutes to obtain the green concrete containing the sludge and the full-graded waste concrete.
Finally, the green concrete containing the sludge and the full-graded waste concrete is prepared, the total weight of the full-graded waste concrete is about 41.9 percent, the absolute dry sludge is about 8.8 percent, and the compressive strength is about 31.2MPa.
Example 4:
(1) Pretreatment of sludge:
Filtering river, lake and sea dredging sediment with 10cm sieve, adding 10 parts of quicklime into each 100 parts of sludge (with water weight), stirring, standing for 5 days, drying, grinding to below 0.08mm, and dividing into two parts, namely part A and part B.
(2) Crushing waste concrete
1) Preliminary crushing is carried out on the waste concrete, and sundries such as reinforcing steel bars and the like are cleaned;
2) Carrying out secondary crushing on the waste concrete to obtain a mixture with the diameter of less than 35 cm;
3) And screening the mixture by adopting a 5mm square-hole screen to obtain the recycled coarse aggregate and the recycled fine aggregate respectively.
(3) Treatment of recycled fine aggregate
1) Mixing the recycled fine aggregate with the A part of the pretreated sludge obtained in the step (1) according to the fine aggregate: sludge: metakaolin: cement=100:5:5:2, thoroughly mixed;
2) Stirring the mixture and water according to the proportion of 100:2, adding the water in a spraying mode, stirring while spraying until the water is added, and curing for at least 7d for later use.
(4) Treatment of recycled coarse aggregate
Spraying water on the recycled coarse aggregate to make the recycled coarse aggregate in a saturated surface dry state.
(5) Preparation of green concrete
Stirring the recycled coarse aggregate, the common aggregate, the recycled fine aggregate in (4), the recycled fine aggregate in (3) and the part B of the pretreated sludge in (1), cement, water and a water reducing agent according to the proportion of 70:205:190:20:100:35:4, fully stirring the recycled coarse aggregate, the common aggregate and the recycled fine aggregate for 1 minute during stirring, sequentially adding the sludge and the cement, stirring for 1 minute, and finally adding the water and the water reducing agent, and stirring for 3 minutes to obtain the green concrete containing the sludge and the full-graded waste concrete.
Finally, the green concrete containing the sludge and the full-graded waste concrete is prepared, the total weight of the full-graded waste concrete is about 41.1 percent, the absolute dry sludge is about 7.1 percent, and the compressive strength is about 34.1MPa.
From the above, it can be seen from the data of examples 1-4 that the concrete prepared by the method can consume about 40% of waste concrete and more than 5% of sludge under the condition that the concrete strength cannot be lower than 30MPa, which is equivalent to common C30 concrete, and the method saves 45% of building materials and has good application prospect.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown, it is well suited to various fields of use for which the invention is suited, and further modifications may be readily made by one skilled in the art, and the invention is therefore not to be limited to the particular details and examples shown and described herein, without departing from the general concepts defined by the claims and the equivalents thereof.
Claims (6)
1. The preparation method of the green concrete based on the sludge and the waste concrete is characterized by comprising the following steps of:
step S1, sludge pretreatment
Stirring the sludge and quicklime, standing, drying and grinding to obtain treated sludge, and dividing the treated sludge into two parts, namely a part A and a part B;
step S2, crushing the waste concrete
Removing sundries in the waste concrete, and crushing and screening the waste concrete to obtain recycled coarse aggregate and recycled fine aggregate;
step S3, treating the regenerated fine aggregate
Fully mixing the recycled fine aggregate obtained in the step S2, the A part of the sludge obtained in the pretreatment in the step S1 and metakaolin and cement, and then mixing and stirring the mixture and water;
Step S4, treating the recycled coarse aggregate
Spraying water to the recycled coarse aggregate obtained in the step S2 to enable the recycled coarse aggregate to be in a saturated surface dry state;
Step S5, preparing green concrete
Mixing and stirring the recycled coarse aggregate obtained by the treatment in the step S4, the common aggregate, the recycled fine aggregate obtained by the treatment in the step S3, the B part of the sludge obtained by the treatment in the step S1, cement, water and a water reducing agent according to the weight ratio of 70:200:195:30:90:40:4, and finally obtaining the green concrete of the target product;
and step S3, fully mixing the recycled fine aggregate obtained in the step S2, the A part of the sludge obtained in the pretreatment in the step S1 and metakaolin, and then mixing and stirring the mixture and water, wherein the method specifically comprises the following operations:
step S31, mixing the recycled fine aggregate obtained in the step S2, the sludge obtained in the pretreatment in the step S1 and metakaolin and cement according to a mass ratio of 100:10:5:2 to obtain a mixture;
Step S32, mixing and stirring the mixture and water according to the mass ratio of 100:3, wherein the water is added in a mode of spraying while stirring until the water is added, and curing for at least 7d for later use;
step S1, stirring the sludge and the quicklime, standing, drying and grinding, and specifically comprises the following operations:
Sieving the sludge, mixing and stirring the sieved sludge and quicklime according to a weight ratio of 100:10, standing and drying, and grinding to 0.08mm for later use after drying; the metakaolin is obtained by grinding kaolinite and calcining at 600-900 ℃; the weight ratio of the part A to the part B is 100: (50-200); the compressive strength of the green concrete is not lower than 30MPa.
2. The method for preparing green concrete based on sludge and waste concrete according to claim 1, wherein the step S2 is to remove impurities in the waste concrete and crush the same to obtain recycled coarse aggregate and recycled fine aggregate, and comprises the following steps:
s21, primarily crushing the waste concrete, and cleaning sundries in the waste concrete;
S22, continuing secondary crushing to obtain a mixture with the diameter of less than 35 mm;
and S23, further screening the mixture obtained in the step S22 to obtain the recycled coarse aggregate and the recycled fine aggregate respectively.
3. The method for preparing green concrete based on sludge and waste concrete according to claim 1, characterized in that said step S5 comprises the following steps in particular;
Step S51, fully stirring the recycled coarse aggregate obtained in the step S4, the common aggregate and the recycled fine aggregate obtained in the step S3;
step S52, continuously adding the sludge obtained in the step S1, and fully stirring;
and step S53, adding water and a water reducing agent, and fully stirring to finally obtain the target product green concrete.
4. The method for preparing green concrete based on sludge and waste concrete according to claim 1, wherein the cement is ultra-fine cement, wherein the bit particle diameter D50 is below 1um, the maximum particle diameter is not more than 18um, and more than 80% of the particle size is below 5 um.
5. The method for preparing green concrete based on sludge and waste concrete according to claim 1, wherein the water reducing agent is an anti-sludge high-efficiency water reducing agent.
6. The method for preparing green concrete based on sludge and waste concrete according to claim 1, wherein the fineness of metakaolin is 4000-18000m 2/Kg.
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| LU506954A LU506954B1 (en) | 2022-08-23 | 2023-03-21 | Production of green concrete products with natural mud and waste concrete |
| PCT/CN2023/082691 WO2024040952A1 (en) | 2022-08-23 | 2023-03-21 | Sludge and waste concrete-based green concrete preparation method |
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| CN117303842A (en) * | 2023-08-15 | 2023-12-29 | 南京交通职业技术学院 | Brick making formula, technology and application based on dredging sludge |
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