CN117164317A - Recycled concrete and preparation method thereof - Google Patents
Recycled concrete and preparation method thereof Download PDFInfo
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- CN117164317A CN117164317A CN202311031804.3A CN202311031804A CN117164317A CN 117164317 A CN117164317 A CN 117164317A CN 202311031804 A CN202311031804 A CN 202311031804A CN 117164317 A CN117164317 A CN 117164317A
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- 239000004567 concrete Substances 0.000 title claims abstract description 105
- 238000002360 preparation method Methods 0.000 title abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000002994 raw material Substances 0.000 claims abstract description 29
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims abstract description 19
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims abstract description 19
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims abstract description 19
- WPKYZIPODULRBM-UHFFFAOYSA-N azane;prop-2-enoic acid Chemical compound N.OC(=O)C=C WPKYZIPODULRBM-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 18
- 239000004575 stone Substances 0.000 claims abstract description 18
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 17
- 239000004568 cement Substances 0.000 claims abstract description 15
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 14
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000002791 soaking Methods 0.000 claims abstract description 13
- 239000010881 fly ash Substances 0.000 claims abstract description 9
- 239000000243 solution Substances 0.000 claims description 34
- 239000004115 Sodium Silicate Substances 0.000 claims description 16
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 16
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 16
- 239000007864 aqueous solution Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 11
- 239000002699 waste material Substances 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 5
- 229920005646 polycarboxylate Polymers 0.000 claims description 5
- 239000003469 silicate cement Substances 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical group C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 235000012207 sodium gluconate Nutrition 0.000 claims description 3
- 239000000176 sodium gluconate Substances 0.000 claims description 3
- 229940005574 sodium gluconate Drugs 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 239000003814 drug Substances 0.000 claims 1
- 230000035699 permeability Effects 0.000 abstract description 23
- 230000008901 benefit Effects 0.000 abstract description 9
- 230000000903 blocking effect Effects 0.000 abstract description 7
- 238000011161 development Methods 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 230000003993 interaction Effects 0.000 abstract description 2
- 230000003628 erosive effect Effects 0.000 abstract 1
- 239000011148 porous material Substances 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 10
- 238000006731 degradation reaction Methods 0.000 description 8
- 230000014759 maintenance of location Effects 0.000 description 8
- 239000010419 fine particle Substances 0.000 description 7
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 210000003739 neck Anatomy 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000002775 capsule Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007858 starting material Substances 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
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the technical field of building materials, and particularly discloses recycled concrete and a preparation method thereof. The recycled concrete is mainly prepared from the following raw materials: water, cement, fly ash, modified recycled coarse aggregate, natural crushed stone, a water reducing agent, a reinforcing agent and a retarder; the modified recycled coarse aggregate is obtained by soaking the recycled coarse aggregate in a modifying solution; the modified solution is mainly prepared from the following raw materials in parts by weight: water, ammonium acrylate, sodium hexametaphosphate, magnesium aluminum silicate inorganic gel powder. The recycled concrete has the advantages of good water permeability, high blocking resistance, high compressive strength and high erosion resistance through the interaction among the raw materials, accords with the development trend of modern cities, has good ecological benefit and economic benefit, and meets the market demand.
Description
Technical Field
The application relates to the technical field of building materials, in particular to recycled concrete and a preparation method thereof.
Background
Along with the rapid rise of national economy in China, large-scale modern construction brings vigorous development to the building industry, and more waste concrete is inevitably generated. In order to reduce environmental pollution and save resources, recycling of waste concrete is one of the important means. When the waste concrete is recycled, the waste concrete is required to be crushed, then screened, washed and dried, and the recycled coarse aggregate is obtained.
Part of researchers directly replace part of natural crushed stone with recycled coarse aggregate, so that recycled concrete is obtained, and the recycled concrete has the characteristics of large porosity and good water permeability because the inside of the recycled concrete can form a through pore channel, and has been applied to pavement. However, with the recycled concrete, fine particles in the environment easily block pore channels under long-term use, reduce road water permeability, and easily produce road ponding when in stormy weather.
Disclosure of Invention
In long-term use, in order to reduce the situation that fine particles block up pore channels of recycled concrete and improve the anti-blocking property of the recycled concrete, the application provides the recycled concrete and a preparation method thereof.
In a first aspect, the present application provides a recycled concrete, which adopts the following technical scheme:
the recycled concrete is mainly prepared from the following raw materials in parts by weight: 175-220 parts of water, 400-450 parts of cement, 80-100 parts of fly ash, 550-600 parts of modified recycled coarse aggregate, 820-880 parts of natural crushed stone, 3-4 parts of water reducer, 1-3 parts of reinforcing agent and 0.1-0.3 part of retarder;
the modified recycled coarse aggregate is obtained by soaking the recycled coarse aggregate in a modifying solution; the modified solution is mainly prepared from the following raw materials in parts by weight: 1000 parts of water, 35-45 parts of ammonium acrylate, 20-30 parts of sodium hexametaphosphate and 100-200 parts of magnesium aluminum silicate inorganic gel powder.
The applicant found that the recycled coarse aggregate was irregular in shape and uneven in corner angles, as compared with the natural crushed stone. If a part of natural crushed stone is directly replaced with recycled coarse aggregate to obtain recycled concrete, there is an extremely fine "neck" formed by the tip of the recycled coarse aggregate in the pore passage inside thereof, resulting in a case where the recycled concrete is liable to block the pore passage by fine particles, on the basis of which, the applicant conducted a great deal of research and achieved the present proposal.
According to the scheme, through the mutual coordination among the raw materials, the inside of the recycled concrete forms smooth, smooth and uniform pore channels, the blocking condition caused by irregular shape and uneven edges and corners of recycled coarse aggregate in the recycled concrete is greatly relieved, the water permeability of the recycled concrete is not influenced, the initial water permeability coefficient is more than 8mm/s, the water permeability coefficient retention rate, the compressive strength and the anti-stripping performance of the recycled concrete are increased, the water permeability coefficient retention rate is more than 91%, the 28d compressive strength is more than 45MPa, the stripping quality loss rate is less than 1.5%, and the recycled concrete has the advantages of good water permeability, high anti-blocking performance, high compressive strength and high anti-stripping performance, and shows good comprehensive performance, so that market demands are met.
Acrylamide, sodium hexametaphosphate and magnesium aluminum silicate inorganic gel powder are added into the raw materials of the modified solution, and the raw materials are coated on the surface of the recycled coarse aggregate by utilizing the synergy between the raw materials, so that convex capsule shells are formed after the two sides of the tip of the recycled coarse aggregate structure are gradually piled up, and continuous coating films are formed between the capsule shells in a gradual bonding way, so that the shape and the outline of the recycled coarse aggregate are more gentle and smooth, and the effect of modifying the recycled coarse aggregate structure is achieved. The modified recycled coarse aggregate replaces part of natural crushed stone, after cement is coated on the recycled coarse aggregate and the natural crushed stone, the modified recycled coarse aggregate can be piled up to form a skeleton-void structure, and a void channel is formed in recycled concrete. Because the structural shape of the modified recycled coarse aggregate of the application tends to be regular, the formed pore channels have certain smoothness, the width of the pore channels is uniform, the situations of extremely fine neck parts and fine particle blocking are reduced, and the situation that the recycled concrete blocks the pore channels due to the fine particles is also reduced, so that the blocking rate of the recycled concrete is reduced. Meanwhile, the convex capsule shell on the surface of the modified recycled coarse aggregate is convenient for coating cement, and the interface bonding strength between the modified recycled coarse aggregate and the cement is increased, so that the compressive strength and the anti-degradation property of the concrete are improved.
Optionally, the weight ratio of the recycled coarse aggregate to the modified solution is 1 (0.5-1.5).
By adopting the technical scheme, the use amount of the modification solution is optimized, so that the modification treatment of the recycled coarse aggregate is facilitated.
In various embodiments, the weight ratio of the recycled coarse aggregate to the modifying solution is 1:1, and the weight ratio can be set to 1:0.5, 1:1.5, and the like as required.
Optionally, the modified recycled coarse aggregate is prepared by the following method: adding the recycled coarse aggregate into the modified solution, mixing, soaking, standing, treating for 3-5h, filtering, and drying to constant weight to obtain the modified recycled coarse aggregate.
By adopting the technical scheme, the soaking time is optimized, the modification effect is reduced due to the too short soaking time, and the time cost is reduced due to the too long soaking time.
In the method for producing a modified recycled coarse aggregate, the soaking and standing treatment time is 4 hours, and the time may be set to 3 hours, 3.5 hours, 4.5 hours, 5 hours, 5.5 hours, 6 hours, or the like as required.
Optionally, the modified solution is prepared by the following method: adding ammonium acrylate and sodium hexametaphosphate into water, mixing, and then adding magnesium aluminum silicate inorganic gel powder, mixing to obtain a modified solution.
By adopting the technical scheme, the preparation of the modified solution is convenient.
Optionally, the recycled coarse aggregate is subjected to the following pretreatment before being soaked in the modifying solution: adding the recycled coarse aggregate into the sodium silicate aqueous solution, mixing, soaking, standing, treating for 7-9h, filtering, and drying to constant weight to obtain the pretreated recycled coarse aggregate.
By adopting the technical scheme, the regenerated coarse aggregate is soaked in the sodium silicate aqueous solution, so that the adhesive force of the modified solution on the regenerated coarse aggregate can be increased, and the treatment effect of the modified solution on the regenerated coarse aggregate is improved in an auxiliary manner. Meanwhile, the sodium silicate in the sodium silicate aqueous solution can be used for pre-filling the pores of the recycled coarse aggregate, bonding cracks of the recycled coarse aggregate, improving the pore structure of the recycled coarse aggregate and improving the anti-blocking property, the compressive strength and the anti-erosion property of the recycled concrete.
In the recycled coarse aggregate pretreatment, the soaking and standing treatment time is 8 hours, and the time may be set to 7 hours, 7.5 hours, 8.5 hours, 9 hours, 9.5 hours, 10 hours, or the like as needed.
Optionally, the weight ratio of the recycled coarse aggregate to the sodium silicate aqueous solution is 1 (0.5-1.5), and the mass concentration of the sodium silicate aqueous solution is 15-20%.
By adopting the technical scheme, the use amount of the sodium silicate aqueous solution is optimized, so that the pretreatment of the recycled coarse aggregate is facilitated.
In various embodiments, the weight ratio of the recycled coarse aggregate to the aqueous sodium silicate solution is 1:1, and the weight ratio can be set to be 1:0.5, 1:1.5 and the like according to the requirements.
Optionally, the granularity of the recycled coarse aggregate is 10-16mm continuous grading; the granularity of the natural crushed stone is 5-10mm in continuous grading.
By adopting the technical scheme, the granularity of the recycled coarse aggregate and the granularity of the natural broken stone are graded, and on the basis of keeping the recycled concrete to have excellent water permeability coefficient, the compactness of the recycled concrete is improved, the compressive strength of the recycled concrete is improved, and the recycled concrete keeps good mechanical properties.
Optionally, the recycled coarse aggregate is obtained by crushing, screening and washing building waste concrete; the construction waste concrete is C30 concrete.
By adopting the technical scheme, the source of the recycled coarse aggregate is limited, the stability of the source of the recycled coarse aggregate is improved, and the stability of the recycled coagulation performance is ensured.
Optionally, the cement is slag silicate cement; the water reducer is a polycarboxylate water reducer; the reinforcing agent is an reinforcing agent SR-02; the retarder is sodium gluconate.
By adopting the technical scheme, the cement, the water reducer, the reinforcing agent and the retarder are optimized, so that the cement, the water reducer, the reinforcing agent and the retarder can be conveniently selected.
In a second aspect, the present application provides a method for preparing the recycled concrete, which adopts the following technical scheme:
the preparation method of the recycled concrete comprises the following steps: mixing water, cement, fly ash, modified recycled coarse aggregate, natural crushed stone, a water reducing agent, a reinforcing agent and a retarder to obtain recycled concrete.
By adopting the technical scheme, the preparation of the recycled concrete is convenient.
In summary, the application has at least the following advantages:
the recycled concrete disclosed by the application is prepared by treating recycled coarse aggregate by ammonium acrylate, sodium hexametaphosphate and magnesium aluminum silicate inorganic gel powder, and utilizing the synergy between the two, so that the shape and the outline of the recycled coarse aggregate are more gentle and smooth, the effect of modifying the structure of the recycled coarse aggregate is achieved, and the recycled concrete is further matched with the interaction of raw materials, so that smooth and uniform pore channels are formed, the situation that extremely fine necks and fine particles are embedded is reduced, the situation that the pore channels are blocked by the recycled concrete due to the fine particles is also reduced, the interface bonding strength between the recycled concrete and the raw materials is increased, the compressive strength and the anti-stripping property of the recycled concrete are improved, the initial water permeability coefficient of the recycled concrete is more than 8mm/s, the water permeability coefficient retention rate is more than 91%, the 28d compressive strength is more than 45MPa, and the stripping mass loss rate is less than 1.5%, and the advantages of good water permeability, high blocking resistance, high compressive strength and high anti-stripping resistance are shown. The recycled concrete provided by the application realizes recycling of the waste building concrete on one hand, improves the anti-blocking property, the compressive strength and the anti-degradation property of the recycled concrete on the other hand, accords with the development trend of modern cities, has good ecological benefit and economic benefit, and meets the market demand.
Detailed Description
In order that the application may be more readily understood, the application will be further described in detail with reference to the following examples, which are given by way of illustration only and are not limiting in scope of application. The starting materials or components used in the present application may be prepared by commercial or conventional methods unless specifically indicated.
Preparation example
Preparation example 1
A modified recycled coarse aggregate, which is prepared by the following method:
s1, adding 40g of ammonium acrylate and 25g of sodium hexametaphosphate into 1000g of water, and stirring for 10min. Then 150g of magnesium aluminum silicate inorganic gel powder is added, and the mixture is stirred for 10min to obtain a modified solution.
Wherein the average particle size of the magnesium aluminum silicate inorganic gel powder is 20 μm and is selected from Hubei Langbowan biological medicine Co.
S2, taking 1000g of the modified solution obtained in the step S1, then adding 1000g of the recycled coarse aggregate, stirring for 10min, soaking, standing for 4h, and filtering. And then drying the mixture to constant weight at the temperature of 50 ℃ to obtain the modified recycled coarse aggregate.
Wherein the recycled coarse aggregate is obtained by crushing, screening and washing building waste concrete, the building waste concrete is C30 concrete, and the granularity of the recycled coarse aggregate is 10-16mm continuous grading.
Preparation example 2
The modified recycled coarse aggregate was different from that of preparation example 1 in that in step S1, the addition amount of ammonium acrylate, sodium hexametaphosphate and magnesium aluminum silicate inorganic gel powder was different, and the addition amount of ammonium acrylate was 35g, the addition amount of sodium hexametaphosphate was 30g and the addition amount of magnesium aluminum silicate inorganic gel powder was 100g.
Preparation example 3
The modified recycled coarse aggregate was different from that of preparation example 1 in that in step S1, the addition amount of ammonium acrylate, sodium hexametaphosphate and magnesium aluminum silicate inorganic gel powder was different, and the addition amount of ammonium acrylate was 45g, the addition amount of sodium hexametaphosphate was 20g and the addition amount of magnesium aluminum silicate inorganic gel powder was 200g.
Preparation example 4
A modified recycled coarse aggregate which is different from preparation example 1 in that in step S2, the recycled coarse aggregate is subjected to the following pretreatment before being added to the modifying solution:
1000g of recycled coarse aggregate is added into 1000g of sodium silicate aqueous solution, stirred for 10min, soaked and stood for 8h, and filtered. And then drying the mixture to constant weight at the temperature of 50 ℃ to obtain the pretreated regenerated coarse aggregate.
Wherein the mass concentration of the sodium silicate aqueous solution is 20%.
Preparation example 5
A modified recycled coarse aggregate which is different from preparation example 1 in that in step S2, the recycled coarse aggregate is subjected to the following pretreatment before being added to the modifying solution:
1000g of recycled coarse aggregate is added into 1000g of sodium silicate aqueous solution, stirred for 10min, soaked and stood for 8h, and filtered. And then drying the mixture to constant weight at the temperature of 50 ℃ to obtain the pretreated regenerated coarse aggregate.
Wherein the mass concentration of the sodium silicate aqueous solution is 15%.
Examples
TABLE 1 content of raw materials (unit: g) of recycled concrete
| Examples | Example 1 | Example 2 | Example 3 |
| Water and its preparation method | 197 | 175 | 220 |
| Cement and its preparation method | 420 | 400 | 450 |
| Fly ash | 90 | 100 | 80 |
| Modified recycled coarse aggregate | 578 | 600 | 550 |
| Natural crushed stone | 850 | 820 | 880 |
| Water reducing agent | 3.5 | 3 | 4 |
| Reinforcing agent | 2 | 3 | 1 |
| Retarder agent | 0.2 | 0.1 | 0.3 |
Example 1
The raw materials and the raw material proportions of the recycled concrete are shown in table 1.
Wherein the cement is slag silicate cement and is selected from slag silicate cement P.S. A42.5; the fly ash is class I fly ash; the granularity of the natural crushed stone is 5-10mm continuous grading; the water reducer is a polycarboxylate water reducer, and the polycarboxylate water reducer is a polycarboxylate water reducer Melflux 2651F; the reinforcing agent is reinforcing agent SR-02; the retarder is sodium gluconate; the modified recycled coarse aggregate is prepared by adopting a preparation example 1.
The preparation method of the recycled concrete comprises the following steps: adding natural broken stone, cement and fly ash into the modified recycled coarse aggregate, stirring for 10min, then adding water, a water reducing agent, an enhancer and a retarder, and stirring for 30min to obtain recycled concrete.
Examples 2 to 3
The difference between the recycled concrete and the example 1 is that the raw material ratio of the recycled concrete is different, and the raw material ratio of the recycled concrete is shown in table 1.
Examples 4 to 7
The difference between the recycled concrete and the recycled concrete in example 1 is that the source of the modified recycled coarse aggregate is different from that of the recycled concrete, and the modified recycled coarse aggregates in examples 4 to 7 are prepared by using preparation example 2, preparation example 3, preparation example 4 and preparation example 5 in order.
Comparative example
Comparative example 1
The recycled concrete is different from example 1 in that the modified recycled coarse aggregate is replaced with the same amount of recycled coarse aggregate in the raw material of the recycled concrete.
Comparative example 2
The difference between the recycled concrete and the recycled concrete in example 1 is that in the method for preparing the modified recycled coarse aggregate, the ammonium acrylate and the sodium hexametaphosphate are replaced by the same amount of water in the raw materials of the recycled concrete.
Comparative example 3
The difference between the recycled concrete and the recycled concrete in example 1 is that in the method for preparing the modified recycled coarse aggregate, the sodium hexametaphosphate is replaced by the same amount of ammonium acrylate.
Comparative example 4
The difference between the recycled concrete and the recycled concrete in example 1 is that in the method for preparing the modified recycled coarse aggregate, the ammonium acrylate is replaced by the sodium hexametaphosphate in the same amount in the raw material of the recycled concrete.
Performance detection
The recycled concrete obtained in examples 1 to 7 and comparative examples 1 to 4 were used as test samples, and the initial water permeability coefficient, blocking resistance, compressive strength and abrasion resistance of the test samples were measured according to DB 37/T5207-2021 technical Standard for Water permeable concrete detection, and the test results are shown in Table 2.
Wherein, in the anti-clogging performance test, the clogging frequency is 10 times, and the higher the water permeability coefficient retention rate is, the better the anti-clogging performance of the recycled concrete is.
In the test of the abrasion resistance, the smaller the abrasion mass loss rate is, the better the abrasion resistance of the recycled concrete is.
TABLE 2 detection results
As can be seen from Table 2, the recycled concrete of the application has good initial water permeability coefficient and higher water permeability coefficient retention rate, the initial water permeability coefficient is 8.6-9.5mm/s, and the water permeability coefficient retention rate is 91.6-94.2%, so that the recycled concrete has high blocking resistance on the basis of keeping good water permeability. Meanwhile, the concrete has the characteristics of high compressive strength, low degradation mass loss rate, 45.1-51.4MPa of 28d compressive strength and 0.8-1.2% of degradation mass loss rate, so that the recycled concrete has high compressive strength and high degradation resistance. The recycled concrete provided by the application has the advantages of good water permeability, high anti-blocking property, high compressive strength and high anti-degradation property through the mutual coordination of the raw materials, and meets the market demand.
Comparative example 1 of recycled concrete raw materials, recycled coarse aggregate was directly substituted for part of natural crushed stone; example 1 of raw materials for recycled concrete, a recycled coarse aggregate was treated with a modifying solution to obtain a modified recycled coarse aggregate, and then a part of natural crushed stone was replaced with the modified recycled coarse aggregate. From this, it can be seen that the modified recycled coarse aggregate obtained after the recycled coarse aggregate is treated by the modifying solution has little influence on the initial water permeability coefficient of recycled concrete, but can greatly increase the water permeability coefficient retention rate and 28d compressive strength, and obviously reduce the degradation quality loss rate. This is probably because the recycled coarse aggregate is treated by the modifying solution, so that the structure shape and the outline are more gentle and smooth, the effect of modifying the recycled coarse aggregate structure is achieved, the situations that the recycled concrete is extremely fine in neck and small particles are embedded are reduced, the interface bonding strength between the recycled concrete is also increased, and the performance of the recycled concrete is improved.
In the modified solution of comparative example 2, the raw materials include aluminum silicate inorganic gel powder; in the modified solution of the comparative example 3, the raw materials include aluminum silicate inorganic gel powder and ammonium acrylate; in the modified solvent of the comparative example 4, the raw materials comprise aluminum silicate inorganic gel powder and sodium hexametaphosphate; in the modified solution of example 1, the raw materials include aluminum silicate inorganic gel powder, ammonium acrylate and sodium hexametaphosphate. From the above, it can be seen that the ammonium acrylate and sodium hexametaphosphate are synchronously added to the raw materials of the modified solution on the basis of the inorganic gel powder of aluminum silicate, and the anti-blocking property, the compressive strength and the anti-denudation property of the recycled concrete can be increased by utilizing the synergy between the ammonium acrylate and sodium hexametaphosphate. In combination with examples 6 to 7, it can be seen that the water permeability coefficient retention rate and the compressive strength can be further increased and the degradation mass loss rate can be further reduced by pretreatment with an aqueous sodium silicate solution before the recycled coarse aggregate is immersed in the modifying solution, so that the recycled concrete exhibits more excellent comprehensive properties.
It should be noted that the above-described embodiments are only for explaining the present application and do not constitute any limitation of the present application. The application has been described with reference to exemplary embodiments, but it is understood that the words which have been used are words of description and illustration, rather than words of limitation. Modifications may be made to the application as defined in the appended claims, and the application may be modified without departing from the scope and spirit of the application. Although the application is described herein with reference to particular means, materials and embodiments, the application is not intended to be limited to the particulars disclosed herein, as the application extends to all other means and applications which perform the same function.
Claims (10)
1. A recycled concrete, characterized by: the traditional Chinese medicine is mainly prepared from the following raw materials in parts by weight: 175-220 parts of water, 400-450 parts of cement, 80-100 parts of fly ash, 550-600 parts of modified recycled coarse aggregate, 820-880 parts of natural crushed stone, 3-4 parts of water reducer, 1-3 parts of reinforcing agent and 0.1-0.3 part of retarder;
the modified recycled coarse aggregate is obtained by soaking the recycled coarse aggregate in a modifying solution; the modified solution is mainly prepared from the following raw materials in parts by weight: 1000 parts of water, 35-45 parts of ammonium acrylate, 20-30 parts of sodium hexametaphosphate and 100-200 parts of magnesium aluminum silicate inorganic gel powder.
2. A recycled concrete according to claim 1, wherein: the weight ratio of the recycled coarse aggregate to the modified solution is 1 (0.5-1.5).
3. A recycled concrete according to claim 1, wherein: the modified recycled coarse aggregate is prepared by the following method: adding the recycled coarse aggregate into the modified solution, mixing, soaking, standing, treating for 3-5h, filtering, and drying to constant weight to obtain the modified recycled coarse aggregate.
4. A recycled concrete according to claim 1, wherein: the modified solution is prepared by the following method: adding ammonium acrylate and sodium hexametaphosphate into water, mixing, and then adding magnesium aluminum silicate inorganic gel powder, mixing to obtain a modified solution.
5. A recycled concrete according to claim 1, wherein: the following pretreatment is carried out before the recycled coarse aggregate is soaked in the modified solution: adding the recycled coarse aggregate into the sodium silicate aqueous solution, mixing, soaking, standing, treating for 7-9h, filtering, and drying to constant weight to obtain the pretreated recycled coarse aggregate.
6. A recycled concrete according to claim 1, wherein: the weight ratio of the recycled coarse aggregate to the sodium silicate aqueous solution is 1 (0.5-1.5), and the mass concentration of the sodium silicate aqueous solution is 15-20%.
7. A recycled concrete according to claim 1, wherein: the granularity of the regenerated coarse aggregate is 10-16mm continuous grading; the granularity of the natural crushed stone is 5-10mm in continuous grading.
8. A recycled concrete according to claim 1, wherein: the recycled coarse aggregate is obtained by crushing, screening and washing building waste concrete; the construction waste concrete is C30 concrete.
9. A recycled concrete according to claim 1, wherein: the cement is slag silicate cement; the water reducer is a polycarboxylate water reducer; the reinforcing agent is an reinforcing agent SR-02; the retarder is sodium gluconate.
10. A method of preparing recycled concrete according to any one of claims 1 to 9, wherein: the method comprises the following steps: mixing water, cement, fly ash, modified recycled coarse aggregate, natural crushed stone, a water reducing agent, a reinforcing agent and a retarder to obtain recycled concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10316460A (en) * | 1997-05-16 | 1998-12-02 | Ohbayashi Corp | Production of regenerated aggregate and production of concrete containing regenerated aggregate |
| JP2005090219A (en) * | 2003-08-11 | 2005-04-07 | Ntt Infranet Co Ltd | Method for regenerating concrete structure |
| JP2006282479A (en) * | 2005-04-04 | 2006-10-19 | Kao Corp | Recycled aggregate-modifying agent |
| KR101173441B1 (en) * | 2012-04-04 | 2012-08-16 | 국보환경(주) | Permeable paving manufacture method to use eco-friendly recycled aggregate coated |
| CN111377635A (en) * | 2018-12-31 | 2020-07-07 | 江苏苏博特新材料股份有限公司 | Concrete modified recycled aggregate, modification method thereof and application thereof in cement-based permeable material |
| CN111620585A (en) * | 2020-06-23 | 2020-09-04 | 宋星雨 | Recycling of construction waste brick and concrete prepared from same |
| CN112608094A (en) * | 2020-07-28 | 2021-04-06 | 厦门天润锦龙建材有限公司 | High-strength concrete prepared from recycled aggregate and preparation method thereof |
| CN113354369A (en) * | 2021-07-23 | 2021-09-07 | 成都志达商品混凝土厂 | High-strength recycled concrete and preparation method thereof |
| CN115196901A (en) * | 2022-08-02 | 2022-10-18 | 平湖市开元混凝土股份有限公司 | Environment-friendly regeneration, recovery and disposal method of cement blocks |
-
2023
- 2023-08-16 CN CN202311031804.3A patent/CN117164317B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10316460A (en) * | 1997-05-16 | 1998-12-02 | Ohbayashi Corp | Production of regenerated aggregate and production of concrete containing regenerated aggregate |
| JP2005090219A (en) * | 2003-08-11 | 2005-04-07 | Ntt Infranet Co Ltd | Method for regenerating concrete structure |
| JP2006282479A (en) * | 2005-04-04 | 2006-10-19 | Kao Corp | Recycled aggregate-modifying agent |
| KR101173441B1 (en) * | 2012-04-04 | 2012-08-16 | 국보환경(주) | Permeable paving manufacture method to use eco-friendly recycled aggregate coated |
| CN111377635A (en) * | 2018-12-31 | 2020-07-07 | 江苏苏博特新材料股份有限公司 | Concrete modified recycled aggregate, modification method thereof and application thereof in cement-based permeable material |
| CN111620585A (en) * | 2020-06-23 | 2020-09-04 | 宋星雨 | Recycling of construction waste brick and concrete prepared from same |
| CN112608094A (en) * | 2020-07-28 | 2021-04-06 | 厦门天润锦龙建材有限公司 | High-strength concrete prepared from recycled aggregate and preparation method thereof |
| CN113354369A (en) * | 2021-07-23 | 2021-09-07 | 成都志达商品混凝土厂 | High-strength recycled concrete and preparation method thereof |
| CN115196901A (en) * | 2022-08-02 | 2022-10-18 | 平湖市开元混凝土股份有限公司 | Environment-friendly regeneration, recovery and disposal method of cement blocks |
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