CN114133183A - Concrete with fully recycled aggregate and preparation method thereof - Google Patents
Concrete with fully recycled aggregate and preparation method thereof Download PDFInfo
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- CN114133183A CN114133183A CN202111475723.3A CN202111475723A CN114133183A CN 114133183 A CN114133183 A CN 114133183A CN 202111475723 A CN202111475723 A CN 202111475723A CN 114133183 A CN114133183 A CN 114133183A
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- aggregate
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- recycled
- coarse aggregate
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- 239000004567 concrete Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 230000001172 regenerating effect Effects 0.000 claims abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 10
- 239000004568 cement Substances 0.000 claims abstract description 7
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 7
- 239000002253 acid Substances 0.000 claims abstract description 6
- 239000010881 fly ash Substances 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 claims abstract description 5
- 239000002893 slag Substances 0.000 claims abstract description 5
- 239000000654 additive Substances 0.000 claims description 17
- 230000000996 additive effect Effects 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 7
- 239000004574 high-performance concrete Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 23
- 239000002699 waste material Substances 0.000 description 23
- 239000002002 slurry Substances 0.000 description 12
- 239000000203 mixture Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 7
- 238000011160 research Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 239000002910 solid waste Substances 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000003426 chemical strengthening reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000010754 BS 2869 Class F Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229920003123 carboxymethyl cellulose sodium Polymers 0.000 description 1
- 229940063834 carboxymethylcellulose sodium Drugs 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 239000005543 nano-size silicon particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000010572 single replacement reaction 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
- 239000002689 soil Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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
- 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
- C04B28/04—Portland 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
- 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
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a concrete of a fully recycled aggregate, which comprises the following components in parts by weight: 350 parts of cement, 80-100 parts of fly ash, 40-100 parts of slag powder, 1000 parts of regenerated fine aggregate, 400 parts of regenerated coarse aggregate 1, 600 parts of regenerated coarse aggregate 2 and 30-50 parts of concrete admixture, wherein the properties of the regenerated fine aggregate are as follows: (regenerative coarse aggregate property 1+ regenerative coarse aggregate property 2) is 1: (0.80-1.0), regenerative coarse aggregate property 1: the regenerative coarse aggregate property 2 is 1: (1.5-2.1), the fineness modulus of the recycled fine aggregate is 2.3-3.0, the particle size of the recycled fine aggregate 1 is 5mm-10mm, the particle size of the recycled coarse aggregate 2 is 10mm-25mm, the admixture is a polycarboxylic acid water reducing agent, the water reducing rate is not less than 27%, and the working performance and the durability of the concrete are improved.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to concrete with fully recycled aggregate and a preparation method thereof.
Background
With the rapid development of economy and the rapid development of urbanization in China, the original natural ecological system is greatly impacted and damaged. The implementation strategies of 'comprehensively saving and recycling resources and enhancing solid waste and garbage disposal' and the like are pushed fully.
With the acceleration of industrialization and urbanization and the rapid development of the construction industry, the method brings a high-efficiency and convenient life style to people and also produces certain negative effects. For example, the generation of a large amount of building waste not only occupies precious cultivated land resources, but also brings serious pollution to living environment of people, directly or indirectly harms atmospheric environment, soil environment and underground water environment, and then suffers endless diseases. According to statistics, the quantity of the construction waste in China accounts for more than 1/3 of the total quantity of the urban waste at the present stage, the annual output of the construction waste exceeds 35 hundred million tons, and the annual output is increased by 10 percent. Wherein the construction waste is only removed, which accounts for over 18 hundred million tons. How to properly treat and dispose the construction waste, turn the harmful into the beneficial, change the waste into the valuable, protect the environment and realize the resource utilization of the construction waste becomes urgent.
How to reasonably and effectively utilize the construction waste has become a very serious problem. The 2012 department of construction establishes Shenzhen city as the first 'construction waste emission reduction and comprehensive utilization trial city', and 2017 department of science and technology successively establishes the 'key technical research and application for preparing green building materials from large solid wastes of industries and cities' and the 'key technical research and application for efficient utilization of whole industrial chain of construction waste recycling' in the national key research and development plan 'green building and building industrialization'. The industrial utilization of the construction solid waste is the focus of the construction solid waste disposal at the present stage.
The prior literature data is consulted, a certain research is already carried out on the comprehensive recycling of the recycled aggregate of the construction waste, and the literature is analyzed, and the following contents are mainly included:
1. different pretreatments to the recycled aggregate of the construction waste, in the link of comprehensive utilization of the recycled aggregate, the quality of the recycled aggregate has great influence on the performance of recycled aggregate concrete, the pretreatment of the recycled aggregate is researched in different routes in the industry, the treatment is mainly a complex interface structure (old aggregate-old slurry, old aggregate-new slurry, old slurry-new slurry) on the surface of the recycled aggregate, the treatment mode mainly comprises physical strengthening, chemical strengthening, composite strengthening and the like, the physical strengthening is mainly realized by heating grinding, grinding by an eccentric device, crushing by a jaw crusher, ball milling by a ball mill, dry mixing by a rotary drum type mixer and the like, the core of the method is that loose mortar on the surface of the recycled aggregate falls off through a series of physical actions, so that a recycled aggregate interface which is compact in surface and can be tightly meshed with post-mixed mortar can be formed.
The chemical strengthening is to repair the rough surface and the existing micro cracks of the recycled aggregate by dipping or spraying cement paste, polyvinyl alcohol solution, water glass solution, nano silicon dioxide solution, permeable crystallization material, waste PE plastic and the like, so as to improve the performance of the recycled aggregate, and the composite strengthening is to strengthen the performance of the aggregate by a physical and chemical combination method.
2. The research on the replacement rate of the recycled aggregate of the construction waste considers the influence of the recycled aggregate on the working performance of concrete in the existing research, each implementation case at the present stage is complex, and the implementation cases respectively comprise partial replacement, full replacement, single replacement, composite replacement and the like, the replacement rate of the recycled aggregate is explained in JGJ/T240-2011 'recycled aggregate application technical Specification', and certain limitation is carried out on application scenes of I, II and III types of recycled aggregates. The utilization rate of the recycled aggregate is limited to a certain extent.
Patent document 201110336012.8 discloses a construction waste recycled aggregate concrete pile, which is mainly prepared from cement, construction waste coarse aggregate and construction waste fine aggregate, wherein the particle size of the construction waste coarse aggregate is 5-40 mm, and the particle size of the construction waste fine aggregate is 2-5 mm. The mixing weight ratio of the cement to the construction waste coarse aggregate to the construction waste fine aggregate is 1 (3-5) to (1.5-3), and the concrete is still low in strength and poor in working performance and durability although the carboxymethyl cellulose sodium is added.
Disclosure of Invention
In view of the above, there is a need for a concrete with fully recycled aggregate and a method for preparing the same, which are beneficial to improving the working performance and durability of the concrete.
The invention provides a concrete of a fully recycled aggregate, which is characterized by comprising the following components in parts by weight: 350 parts of cement, 80-100 parts of fly ash, 40-100 parts of slag powder, 1000 parts of regenerated fine aggregate, 400 parts of regenerated coarse aggregate 1, 600 parts of regenerated coarse aggregate 2 and 30-50 parts of concrete admixture, wherein the properties of the regenerated fine aggregate are as follows: (regenerative coarse aggregate property 1+ regenerative coarse aggregate property 2) is 1: (0.80-1.0), regenerative coarse aggregate property 1: the regenerative coarse aggregate property 2 is 1: (1.5-2.1), the fineness modulus of the recycled fine aggregate is 2.3-3.0, the particle diameter of the recycled fine aggregate 1 is 5mm-10mm, the particle diameter of the recycled coarse aggregate 2 is 10mm-25mm, and the additive is a polycarboxylic acid water reducing agent and the water reducing rate is not less than 27%.
The invention provides a method for preparing the concrete of the fully recycled aggregate, which comprises the steps of adding the raw materials except the additive into a stirring container according to a certain proportion, uniformly stirring in advance, adding the additive and water, stirring for 1min-5min, standing for 1min-5min, and finally stirring for 1min-5min to obtain the high-performance concrete of the fully recycled aggregate.
Compared with the prior art, the method adopts the fully recycled aggregate, can realize the preparation of the concrete without using natural aggregate (such as sand and stone), and the prepared concrete has excellent working performance and durability.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without inventive step, are within the scope of the present invention.
The present invention provides the following examples and comparative examples.
Example 1
The concrete of example 1 was prepared as follows:
the raw materials except the additive are added into a stirring container according to a certain proportion and stirred uniformly in advance, then the additive and water are added and stirred for 5min, then the mixture is kept stand for 5min, and finally the mixture is stirred for 3min to obtain the concrete.
The concrete properties of example 1 were as follows:
example 2
The concrete of example 2 was prepared as follows:
the raw materials except the additive are added into a stirring container according to a certain proportion and stirred uniformly in advance, then the additive and water are added and stirred for 2min, then the mixture is kept stand for 3min, and finally the mixture is stirred for 5min to obtain the concrete.
The concrete properties of example 2 were as follows:
example 3
The concrete of example 3 was prepared as follows:
the raw materials except the additive are added into a stirring container according to a certain proportion and stirred uniformly in advance, then the additive and water are added and stirred for 5min, then the mixture is kept stand for 5min, and finally the mixture is stirred for 5min to obtain the concrete.
The concrete properties of example 3 were as follows:
comparative example 1
| Name of Material | Material requirements | Dosage (parts by mass) |
| Water (W) | General | 157 |
| Cement | Portland cement of 44R strength grade | 202 |
| Fly ash | Class F class II fly ash | 80 |
| Slag powder | S95 grade slag powder | 45 |
| Recycled fine aggregate | Fineness modulus of 3 | 911 |
| Recycled coarse aggregate | Single particle size fraction 30mm | 911 |
| Water reducing agent | The water reducing rate of the polycarboxylic acid water reducing agent is 20 percent | 33 |
The raw materials except the additive are added into a stirring container according to a certain proportion and stirred uniformly in advance, and then the additive and water are added and stirred for 5min to obtain the concrete.
The concrete properties of comparative example 1 were as follows:
comparative example 2
The raw materials except the additive are added into a stirring container according to a certain proportion and stirred uniformly in advance, and then the additive and water are added and stirred for 5min to obtain the concrete.
The concrete properties of comparative example 2 were as follows:
as can be seen from the above test results of comparative examples 1 and 2, the blend did not have any slump and spreadability after 1 hour, was poor in flowability and workability, and could not be used for construction molding, and the strength value could not be measured.
As can be seen from the above examples 1-3 and comparative examples 1-2, the concrete of the fully recycled aggregate provided by the invention is beneficial to improving the working performance and the durability of the concrete. The inventor researches and considers that the main reasons are as follows: the invention selects the fully recycled aggregate, which comprises recycled fine aggregate, recycled coarse aggregate 1 and recycled coarse aggregate 2 with specific particle size requirement, and the properties of the recycled fine aggregate are as follows: (regenerative coarse aggregate property 1+ regenerative coarse aggregate property 2) is 1: (0.80-1.0), recycled coarse aggregate property 1: the regenerative coarse aggregate property 2 is 1: (1.5-2.1), and the additive is a polycarboxylic acid water reducing agent with the water reducing rate of not less than 27%. The recycled aggregate can be compounded, the recycled aggregate can be tightly stacked, the interface structure of the old aggregate and the old slurry of the fully recycled aggregate can be wrapped and repaired by the slurry, the high-fluidity slurry can be immersed into the gap and the hole between the old aggregate and the old slurry for effective filling, and meanwhile, the high-fluidity slurry can also effectively realize the filling and wrapping between the old slurry and the new slurry, so that the porosity of the fully recycled aggregate concrete is integrally reduced, the slump and the extensibility are good, the engineering transportation, the pouring and the molding are facilitated, and the workability and the durability of the concrete can be improved; in addition, because the fully recycled aggregate has higher water absorption rate and more open pores of the aggregate, the high-fluidity slurry can be continuously filled and extruded in the pores to release gas in the mixture in the mixing process, so that the internal porosity of the mixture is higher, the invention controls the mixing process, stirs for 1-5min in advance, then adopts a standing mode for 1-5min to fully release the gas in the open pores of the recycled aggregate, realizes the full wrapping and repairing of the complex interface of the recycled aggregate by the slurry, stirs for 1-5min again, releases the gas which is displaced from the recycled aggregate and is suspended in the concrete mixture in the early stage, realizes the uniform and dense quality of the concrete mixture, and reduces the internal porosity of the concrete, meanwhile, the polycarboxylic acid water reducing agent with the water reducing rate of not less than 27% is selected, so that the concrete has high fluidity and excellent water retention and cohesiveness. The problems that the existing building waste recycled aggregate has high water absorption rate, unstable physical indexes such as crushing value and the like and is poor in discrete type, has more internal structure defects and is poor in occlusion with a cementing material behind the internal structure defects and the like can be solved.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and the above embodiments are only used for explaining the claims. The scope of the invention is not limited by the description. Any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present disclosure are included in the scope of the present invention.
Claims (2)
1. The concrete of the fully recycled aggregate is characterized by comprising the following components in parts by weight: 350 parts of cement, 80-100 parts of fly ash, 40-100 parts of slag powder, 1000 parts of regenerated fine aggregate, 400 parts of regenerated coarse aggregate 1, 600 parts of regenerated coarse aggregate 2 and 30-50 parts of concrete admixture, wherein the properties of the regenerated fine aggregate are as follows: (regenerative coarse aggregate property 1+ regenerative coarse aggregate property 2) is 1: (0.80-1.0), regenerative coarse aggregate property 1: the regenerative coarse aggregate property 2 is 1: (1.5-2.1), the fineness modulus of the recycled fine aggregate is 2.3-3.0, the particle diameter of the recycled fine aggregate 1 is 5mm-10mm, the particle diameter of the recycled coarse aggregate 2 is 10mm-25mm, and the additive is a polycarboxylic acid water reducing agent and the water reducing rate is not less than 27%.
2. The method for preparing the concrete of the fully recycled aggregate according to claim 1, characterized in that the high-performance concrete of the fully recycled aggregate is obtained by adding the raw materials except the additive into a stirring container according to a certain proportion, uniformly stirring in advance, then adding the additive and water, stirring for 1min to 5min, standing for 1min to 5min, and finally stirring for 1min to 5 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111475723.3A CN114133183A (en) | 2021-12-06 | 2021-12-06 | Concrete with fully recycled aggregate and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111475723.3A CN114133183A (en) | 2021-12-06 | 2021-12-06 | Concrete with fully recycled aggregate and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114133183A true CN114133183A (en) | 2022-03-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111475723.3A Pending CN114133183A (en) | 2021-12-06 | 2021-12-06 | Concrete with fully recycled aggregate and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114133183A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115073124A (en) * | 2022-07-20 | 2022-09-20 | 安徽绿科节能材料科技有限公司 | High polymer environment-friendly recycled concrete and preparation method thereof |
| CN117735944A (en) * | 2023-12-20 | 2024-03-22 | 中国建筑第二工程局有限公司 | Construction method for solidifying building rubbish recycled aggregate by using novel cementing material |
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| CN103819152A (en) * | 2013-12-30 | 2014-05-28 | 辽宁工程技术大学 | Method for reinforcing recycled aggregate concrete by changing stirring technology |
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2021
- 2021-12-06 CN CN202111475723.3A patent/CN114133183A/en active Pending
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| CN103819152A (en) * | 2013-12-30 | 2014-05-28 | 辽宁工程技术大学 | Method for reinforcing recycled aggregate concrete by changing stirring technology |
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| Title |
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| 冯庆革 等: "矿物掺合料对全再生骨料混凝土性能的影响", 《广西大学学报》 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115073124A (en) * | 2022-07-20 | 2022-09-20 | 安徽绿科节能材料科技有限公司 | High polymer environment-friendly recycled concrete and preparation method thereof |
| CN117735944A (en) * | 2023-12-20 | 2024-03-22 | 中国建筑第二工程局有限公司 | Construction method for solidifying building rubbish recycled aggregate by using novel cementing material |
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Application publication date: 20220304 |