CN115677251A - Preparation method of waste concrete recycled aggregate - Google Patents
Preparation method of waste concrete recycled aggregate Download PDFInfo
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- CN115677251A CN115677251A CN202211350664.1A CN202211350664A CN115677251A CN 115677251 A CN115677251 A CN 115677251A CN 202211350664 A CN202211350664 A CN 202211350664A CN 115677251 A CN115677251 A CN 115677251A
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- 239000002699 waste material Substances 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000002791 soaking Methods 0.000 claims abstract description 41
- 238000003756 stirring Methods 0.000 claims abstract description 38
- 238000000498 ball milling Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 23
- -1 hexyl lactone Chemical class 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 23
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims abstract description 22
- 238000012216 screening Methods 0.000 claims abstract description 15
- 239000005057 Hexamethylene diisocyanate Substances 0.000 claims abstract description 11
- 229920006037 cross link polymer Polymers 0.000 claims abstract description 11
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims abstract description 11
- 235000019341 magnesium sulphate Nutrition 0.000 claims abstract description 11
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 11
- 239000004850 liquid epoxy resins (LERs) Substances 0.000 claims abstract description 10
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000004048 modification Effects 0.000 claims abstract description 9
- 238000012986 modification Methods 0.000 claims abstract description 9
- 238000001914 filtration Methods 0.000 claims abstract description 8
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 8
- 239000000454 talc Substances 0.000 claims abstract description 8
- 229910052623 talc Inorganic materials 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 32
- 239000002245 particle Substances 0.000 claims description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- 239000004575 stone Substances 0.000 claims description 7
- 235000012222 talc Nutrition 0.000 claims description 7
- PWKSKIMOESPYIA-BYPYZUCNSA-N L-N-acetyl-Cysteine Chemical compound CC(=O)N[C@@H](CS)C(O)=O PWKSKIMOESPYIA-BYPYZUCNSA-N 0.000 claims description 6
- 229960004308 acetylcysteine Drugs 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 229940102552 disteardimonium hectorite Drugs 0.000 claims description 4
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 2
- 238000010521 absorption reaction Methods 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 3
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 abstract description 2
- 239000011148 porous material Substances 0.000 abstract description 2
- 239000002912 waste gas Substances 0.000 abstract description 2
- 238000000227 grinding Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 6
- KWLMIXQRALPRBC-UHFFFAOYSA-L hectorite Chemical compound [Li+].[OH-].[OH-].[Na+].[Mg+2].O1[Si]2([O-])O[Si]1([O-])O[Si]([O-])(O1)O[Si]1([O-])O2 KWLMIXQRALPRBC-UHFFFAOYSA-L 0.000 description 5
- 229910000271 hectorite Inorganic materials 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009837 dry grinding Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a preparation method of waste concrete recycled aggregate, which comprises the following steps of S1, pretreating waste concrete, putting the waste concrete into water to be soaked until the waste concrete is saturated by water absorption, and filtering and airing to obtain soaked aggregate; s2, soaking the soaked aggregate in the modified solution and intermittently stirring, adding an auxiliary agent during intermittent stirring, fishing out after stirring is finished, and draining to obtain modified aggregate; wherein the modified solution comprises polymethyl siloxane, magnesium sulfate, aluminum oxide and liquid epoxy resin; s3, uniformly mixing the modified aggregate and the mixed abrasive, and performing ball milling and screening to obtain a recycled aggregate; the mixed abrasive includes silica, talc and HDI/trimethylol hexyl lactone crosspolymer. The invention improves the pores and cracks in the waste gas concrete and reduces the water absorption, and the recycled aggregate prepared by the modification has the advantage of high strength grade.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a preparation method of waste concrete recycled aggregate.
Background
In recent years, with the further development of the urbanization process of China and the gradual updating of cities, the demolition and the reconstruction of original buildings in urban construction such as shed change, roads, bridges and the like generate a large amount of construction waste. However, most of the construction waste is not treated at all and is transported to the outskirts or the periphery of cities for simple landfill or open-air stockpiling, which not only wastes land and resources, but also pollutes the environment; on the other hand, with the increasing population, the demand of sandstone aggregate for the construction industry is increasing. For a long time, as the sandstone aggregate is wide in source, easy to obtain and low in price, the sandstone aggregate is regarded as an inexhaustible raw material and is randomly mined, so that the resource is exhausted, the mountain landslide and the river bed are rerouted, and the natural environment is seriously damaged.
The recycled concrete technology is one of the main measures for developing green concrete and realizing sustainable development of buildings, resources and environments, and is increasingly paid attention by people. However, the existing recycled concrete technology has the problems of low utilization rate of the recycled aggregate of the waste concrete, complex process and substandard strength grade of the recycled concrete. In view of this, it would be very significant to provide a recycled concrete prepared from waste concrete and a method for preparing the same.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a preparation method of a recycled aggregate of waste concrete, which improves the pores and cracks in waste concrete and reduces the water absorption rate, and the recycled aggregate prepared after modification has the advantage of high strength grade.
The above object of the present invention is achieved by the following technical solutions:
a preparation method of waste concrete recycled aggregate comprises the following steps,
s1, pretreating waste concrete, soaking the waste concrete in water until the waste concrete is saturated in water, and filtering and drying the waste concrete to obtain soaked aggregate;
s2, soaking the soaked aggregate in a modification solution and intermittently stirring, adding an auxiliary agent during intermittent stirring, fishing out after stirring is finished, and draining to obtain a modified aggregate; wherein the modified solution comprises polymethyl siloxane, magnesium sulfate, aluminum oxide and liquid epoxy resin;
s3, uniformly mixing the modified aggregate and the mixed abrasive, and performing ball milling and screening to obtain a recycled aggregate; the mixed abrasive includes silica, talc and HDI/trimethylol hexyl lactone crosspolymer.
Further, in the step S1, the pretreatment process comprises the step of crushing and screening the waste concrete to obtain coarse aggregate with the particle size of 5-30mm.
Further, in the step S2, the volume ratio of the soaking aggregate to the modifying solution is 1: (1 to 10), wherein the mass ratio of the polymethylsiloxane to the magnesium sulfate to the aluminum oxide to the liquid epoxy resin is (0.4 to 0.6): (0.3 to 0.5): (0.1 to 0.2) 1.
Further, in the S2, the auxiliaries are disteardimonium hectorite and acetylcysteine.
Further, in the S2, the volume ratio of the soaking aggregate to the auxiliary agent is 1: (0.5 to 1.0), wherein the mass ratio of the disteardimonium hectorite to the acetyl chitosamine is 1: (0.8 to 1.2).
Further, in the S2, the total soaking time is 4 to 6 hours, the stirring is carried out for 4~6 times at equal time intervals, and the stirring is carried out for 20 to 30min at the rotating speed of 800 to 1500r/min each time.
Further, in the S2, before 2~3 times of stirring, an auxiliary agent is added to the modification solution.
Further, in the S2, the mass ratio of the modified aggregate to the mixed abrasive is 1: (0.05 to 0.10), wherein the mass ratio of silica, talcum powder and HDI/trihydroxymethyl hexyl lactone cross-linked polymer is 1: (0.8 to 1.2): (1.8 to 2.2).
Further, in the step S2, alumina ball stones are used as ball milling media, and the mass ratio of the modified aggregate to the mixed abrasive, the ball milling media to water is 1: (2.0 to 3.0): (0.8 to 1.2).
Further, in the S2, the ball milling rotating speed is 10 to 15r/min, and the ball milling time is 2 to 3h.
In conclusion, the beneficial technical effects of the invention are as follows:
1. according to the invention, the regenerated aggregate is modified twice by using the modification solution and the mixed abrasive, magnesium sulfate and talcum powder can be fully filled into gaps and cracks of the regenerated aggregate, the water absorption rate of the regenerated aggregate is reduced, polymethylsiloxane and alumina are used as auxiliary materials to form a layer of film on the regenerated aggregate, the structure and the wear resistance of the surface of the regenerated aggregate are optimized, and then the silica and HDI/trimethylol hexyl lactone cross-linked polymer are used for ball milling and dispersion, so that the section cohesiveness between the regenerated aggregate and slurry is further optimized, and the mechanical property of the regenerated concrete is improved;
2. the invention adopts three steps of soaking, soaking modified solution and ball milling of mixed grinding material in sequence, and the steps can not be replaced and changed in sequence, thereby achieving the optimal compression strength;
3. the waste gas concrete selected by the invention is industrial waste, so that the performance of the construction waste is improved and the cyclic utilization of resources is realized, the method conforms to the policy of sustainable development in China, not only can natural resources be saved, but also a new direction is provided for the utilization of the industrial waste and the construction solid waste;
4. the method has the advantages of simple operation process, no need of complex equipment and other raw materials, low cost and high economic value and application value.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the functions of the invention clearer and easier to understand, the invention is further described in the following with the specific embodiments.
Example 1: the invention discloses a method for preparing recycled aggregate of waste concrete, which comprises the following steps,
s1, crushing and screening waste concrete to obtain coarse aggregate with the particle size of 5-30mm, soaking the coarse aggregate in water until water absorption is saturated, filtering and airing to obtain soaked aggregate;
s2, mixing polymethylsiloxane, magnesium sulfate, aluminum oxide and liquid epoxy resin according to the weight ratio of 0.5:0.4: mixing the components in a mass ratio of 0.1;
hectorite of disteardimonium and acetylcysteine were mixed in a 1:1.0 to obtain an auxiliary agent;
soaking the soaking aggregate in the modified solution, and controlling the volume ratio of the soaking aggregate to the modified solution to be 1:5, soaking for 5 hours, stirring for 5 times at equal time intervals, stirring for 25min at the rotating speed of 1000r/min each time, adding an auxiliary agent into the modified solution before stirring for the 2 nd time, and controlling the volume ratio of the soaking aggregate to the auxiliary agent to be 1:0.8, uniformly stirring, fishing out after intermittent stirring is finished, and draining to obtain modified aggregate;
s3 silica, talc and HDI/Trimethylol hexyl lactone crosspolymer were mixed according to a 1:1.0:2.0 to obtain a mixed abrasive;
mixing the modified aggregate and the mixed abrasive according to the proportion of 1: uniformly mixing according to the mass ratio of 0.08, adopting alumina ball stones as ball milling media, performing ball milling and screening, and controlling the mass ratio of the modified aggregate to the mixed abrasive, the ball milling media to water to be 1:2.5:1.0, grinding speed of 12r/min, and ball milling time of 2h to obtain the recycled aggregate with the particle size of 5-25mm.
Using the prepared recycled aggregate for preparing recycled concrete, wherein the method comprises the following steps of carrying out dry milling on 462.00kg/m cement; carrying out dry bottom-up tailing powder 84.00 kg/m; carrying out 54.00kg/m high-speed cultivation on the silicon ash; carrying out river sand 698.00kg/m high speed cultivation; 10 to 20mm recycled aggregate 703.00kg/m for production of powder; 5-10mm recycled aggregate 301.00 kg/m; carrying out 18.00kg/m high-speed ethanol planting on the polycarboxylic acid water reducing agent; the balance being water.
The prepared recycled concrete is subjected to mechanical property detection, the 7-day compressive strength is 125.2MPa, and the 28-day compressive strength is 146.3MPa.
Example 2: the invention discloses a method for preparing recycled aggregate of waste concrete, which comprises the following steps,
s1, crushing and screening waste concrete to obtain coarse aggregate with the particle size of 5-30mm, soaking the coarse aggregate in water until water absorption is saturated, filtering and airing to obtain soaked aggregate;
s2, mixing polymethylsiloxane, magnesium sulfate, aluminum oxide and liquid epoxy resin according to the weight ratio of 0.4:0.5: mixing according to the mass ratio of 0.2;
hectorite of disteardimonium and acetylcysteine were mixed in a 1: mixing the components in a mass ratio of 0.9 to obtain an auxiliary agent;
soaking the soaking aggregate in the modified solution, and controlling the volume ratio of the soaking aggregate to the modified solution to be 1:1, soaking for 4 hours, stirring for 4 times at equal time intervals, stirring for 30min at the rotating speed of 800r/min each time, adding an auxiliary agent into the modified solution before stirring for the 2 nd time, and controlling the volume ratio of the soaking aggregate to the auxiliary agent to be 1:0.5, uniformly stirring, fishing out after intermittent stirring is finished, and draining to obtain modified aggregate;
s3 silica, talc and HDI/Trimethylol hexyl lactone crosspolymer were mixed in the following ratio 1:0.9:2.2 to obtain a mixed abrasive;
mixing the modified aggregate and the mixed abrasive according to the proportion of 1: uniformly mixing according to the mass ratio of 0.06, adopting alumina ball stones as ball milling media, carrying out ball milling and screening, and controlling the mass ratio of the modified aggregate to the mixed abrasive, the ball milling media to water to be 1:3.0:0.9, grinding speed of 10r/min, and ball milling time of 3h to obtain the recycled aggregate with the particle size of 5-25mm.
Example 3: the invention discloses a method for preparing recycled aggregate of waste concrete, which comprises the following steps,
s1, crushing and screening waste concrete to obtain coarse aggregate with the particle size of 5-30mm, soaking the coarse aggregate in water until water absorption is saturated, filtering and airing to obtain soaked aggregate;
s2, mixing polymethylsiloxane, magnesium sulfate, aluminum oxide and liquid epoxy resin according to the weight ratio of 0.6:0.3: mixing the components in a mass ratio of 0.1;
hectorite of disteardimonium and acetylcysteine were mixed in a 1: mixing the components in a mass ratio of 0.8 to obtain an auxiliary agent;
soaking the soaked aggregate in the modified solution, and controlling the volume ratio of the soaked aggregate to the modified solution to be 1:6, soaking for 6 hours, stirring for 6 times at equal time intervals, stirring for 20min at the rotating speed of 1500r/min each time, adding an auxiliary agent into the modified solution before stirring for the 3 rd time, and controlling the volume ratio of the soaking aggregate to the auxiliary agent to be 1:1.0, uniformly stirring, fishing out after intermittent stirring is finished, and draining to obtain modified aggregate;
s3 silica, talc and HDI/Trimethylol hexyl lactone crosspolymer were mixed according to a 1:0.8:1.8 to obtain a mixed abrasive;
mixing the modified aggregate and the mixed abrasive according to the proportion of 1:1.00, adopting alumina ball stone as a ball milling medium, performing ball milling and screening, and controlling the mass ratio of the modified aggregate to the mixed abrasive, the ball milling medium and the water to be 1:2.0:0.8, grinding speed of 15r/min, and ball milling time of 2h to obtain the recycled aggregate with the particle size of 5-25mm.
Example 4: the invention discloses a method for preparing recycled aggregate of waste concrete, which comprises the following steps,
s1, crushing and screening waste concrete to obtain coarse aggregate with the particle size of 5-30mm, soaking the coarse aggregate in water until water absorption is saturated, filtering and airing to obtain soaked aggregate;
s2, mixing polymethylsiloxane, magnesium sulfate, aluminum oxide and liquid epoxy resin according to the weight ratio of 0.5:0.5: mixing according to the mass ratio of 0.2;
hectorite of disteardimonium and acetyl chitosamine were mixed according to a 1:1.2 to obtain an auxiliary agent;
soaking the soaking aggregate in the modified solution, and controlling the volume ratio of the soaking aggregate to the modified solution to be 1:10, soaking for 5 hours, stirring for 5 times at equal time intervals, stirring for 30min at the rotating speed of 900r/min each time, adding an auxiliary agent into the modified solution before stirring for the 2 nd time, and controlling the volume ratio of the soaking aggregate to the auxiliary agent to be 1:0.9, uniformly stirring, fishing out after intermittent stirring is finished, and draining to obtain modified aggregate;
s3 silica, talc and HDI/Trimethylol hexyl lactone crosspolymer were mixed according to a 1:1.1:2.1 to obtain a mixed abrasive;
mixing the modified aggregate and the mixed abrasive according to the proportion of 1:0.05, adopting alumina ball stone as a ball milling medium, performing ball milling and screening, and controlling the mass ratio of the modified aggregate to the mixed grinding material, the ball milling medium and the water to be 1:2.2:1.1, grinding at the rotation speed of 13r/min for 3h to obtain the recycled aggregate with the particle size of 5-25mm.
Example 5: the invention discloses a method for preparing recycled aggregate of waste concrete, which comprises the following steps,
s1, crushing and screening waste concrete to obtain coarse aggregate with the particle size of 5-30mm, soaking the coarse aggregate in water until water absorption is saturated, filtering and airing to obtain soaked aggregate;
s2, mixing polymethylsiloxane, magnesium sulfate, aluminum oxide and liquid epoxy resin according to the weight ratio of 0.6:0.3: mixing the components in a mass ratio of 0.1;
hectorite of disteardimonium and acetylcysteine were mixed in a 1:1.1 to obtain an auxiliary agent;
soaking the soaking aggregate in the modified solution, and controlling the volume ratio of the soaking aggregate to the modified solution to be 1:4, soaking for 6 hours, stirring for 6 times at equal time intervals, stirring for 30min at the rotating speed of 1200r/min each time, adding an auxiliary agent into the modified solution before stirring for the 3 rd time, and controlling the volume ratio of the soaking aggregate to the auxiliary agent to be 1:0.6, uniformly stirring, fishing out after intermittent stirring is finished, and draining to obtain modified aggregate;
s3 silica, talc and HDI/Trimethylol hexyl lactone crosspolymer were mixed according to a 1:1.2:1.9 to obtain a mixed abrasive;
mixing the modified aggregate and the mixed abrasive according to the proportion of 1: uniformly mixing according to the mass ratio of 0.09, adopting alumina ball stones as ball milling media, carrying out ball milling and screening, and controlling the mass ratio of the modified aggregate to the mixed grinding material, the ball milling media to water to be 1:2.8:1.2, grinding at the rotation speed of 10r/min for 2h to obtain the recycled aggregate with the particle size of 5-25mm.
Comparative example 1: the invention discloses a preparation method of recycled aggregate of waste concrete, which is different from the embodiment 1 in that a modification solution is not used. The prepared recycled concrete is subjected to mechanical property detection, the compressive strength is 35.8MPa in 7 days, and the compressive strength is 52.4MPa in 28 days.
Comparative example 2: the invention discloses a preparation method of waste concrete recycled aggregate, which is different from the preparation method of the embodiment 1 in that no auxiliary agent is used. The prepared recycled concrete is subjected to mechanical property detection, the compressive strength is 100.5MPa in 7 days, and the compressive strength is 122.3MPa in 28 days.
Comparative example 3: the invention discloses a preparation method of recycled aggregate of waste concrete, which is different from the embodiment 1 in that a mixed abrasive is not used. The prepared recycled concrete is subjected to mechanical property detection, the compressive strength is 68.9MPa in 7 days, and the compressive strength is 94.6MPa in 28 days.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. A preparation method of waste concrete recycled aggregate is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
s1, pretreating waste concrete, soaking the waste concrete in water until the waste concrete is saturated in water, and filtering and drying the waste concrete to obtain soaked aggregate;
s2, soaking the soaked aggregate in the modified solution and intermittently stirring, adding an auxiliary agent during intermittent stirring, fishing out after stirring is finished, and draining to obtain modified aggregate; wherein the modified solution comprises polymethylsiloxane, magnesium sulfate, aluminum oxide and liquid epoxy resin;
s3, uniformly mixing the modified aggregate and the mixed abrasive, and performing ball milling and screening to obtain recycled aggregate; the mixed abrasive includes silica, talc and HDI/trimethylol hexyl lactone crosspolymer.
2. The method for preparing the recycled aggregate of waste concrete according to claim 1, wherein the method comprises the following steps: in the S1, the pretreatment process comprises the step of crushing and screening the waste concrete to obtain coarse aggregate with the particle size of 5-30mm.
3. The method for preparing the recycled aggregate of the waste concrete according to claim 1, wherein the method comprises the following steps: in the S2, the volume ratio of the soaking aggregate to the modification solution is 1: (1 to 10), wherein the mass ratio of the polymethylsiloxane to the magnesium sulfate to the aluminum oxide to the liquid epoxy resin is (0.4 to 0.6): (0.3 to 0.5): (0.1 to 0.2) 1.
4. The method for preparing the recycled aggregate of the waste concrete according to claim 3, wherein the method comprises the following steps: in the S2, the auxiliary agents are disteardimonium hectorite and acetyl chitosamine.
5. The method for preparing the recycled aggregate of the waste concrete according to claim 4, wherein the method comprises the following steps: in S2, the volume ratio of the soaking aggregate to the auxiliary agent is 1: (0.5 to 1.0), wherein the mass ratio of the disteardimonium hectorite to the acetylcysteine is 1: (0.8 to 1.2).
6. The method for preparing the recycled aggregate of the waste concrete according to claim 5, wherein the method comprises the following steps: and in the S2, the total soaking time is 4 to 6h, the mixture is stirred for 4~6 times at equal time intervals, and the mixture is stirred for 20 to 30min at the rotating speed of 800 to 1500r/min each time.
7. The method for preparing the recycled aggregate of the waste concrete according to claim 6, wherein the method comprises the following steps: in the S2, before 2~3 times of stirring, an auxiliary agent is added into the modification solution.
8. The method for preparing the recycled aggregate of the waste concrete according to claim 1, wherein the method comprises the following steps: in the S2, the mass ratio of the modified aggregate to the mixed abrasive is 1: (0.05 to 0.10), wherein the mass ratio of silica, talcum powder and HDI/trihydroxymethyl hexyl lactone crosslinked polymer is 1: (0.8 to 1.2): (1.8 to 2.2).
9. The method for preparing the recycled aggregate of the waste concrete according to claim 8, wherein the method comprises the following steps: in S2, alumina ball stone is used as a ball milling medium, and the mass ratio of the modified aggregate to the mixed abrasive to the ball milling medium to water is 1: (2.0 to 3.0): (0.8 to 1.2).
10. The method for preparing the recycled aggregate of waste concrete according to claim 9, wherein the method comprises the following steps: in the S2, the ball milling speed is 10 to 15r/min, and the ball milling time is 2 to 3h.
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| CN116161929A (en) * | 2023-03-02 | 2023-05-26 | 深圳市龙岗大工业区混凝土有限公司 | Recycled concrete and preparation method thereof |
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