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Super-early-strength recycled concrete and preparation method thereof

A recycled concrete and concrete technology, applied in the field of building materials, can solve the problems of slow strength development of recycled concrete, large porosity of recycled aggregates, complex interface transition zone, etc., to increase the strength development rate, reduce the setting time, and reduce the water absorption rate Effect

Pending Publication Date: 2021-12-14
江西秀川科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, recycled concrete still has disadvantages such as slow strength development. Due to the large porosity of recycled aggregates, many cracks, and complex interfacial transition zones, it is difficult to form a new support structure for strength development.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 A super early strength recycled concrete and its preparation method

[0033] 170 parts of water, 140 parts of lightly burned magnesium powder, 20 parts of silica fume, 100 parts of magnesium chloride hexahydrate, 400 parts of natural aggregate, 1400 parts of reinforced recycled aggregate, and 6 parts of admixture.

[0034] (1) Prepare recycled coarse aggregate and pretreat concrete fine particles;

[0035] (2) Prepare magnesium chloride solution, mix the fine concrete particles pretreated in step 1 with natural aggregates and reinforced recycled aggregates, and mix lightly burned magnesium and silica fume;

[0036] (3) Mix the material obtained in step 2 with the magnesium chloride solution evenly, add the admixture, stir evenly, and obtain super early strength recycled concrete after hardening.

Embodiment 2

[0037] Example 2 A kind of super early strength recycled concrete and its preparation method

[0038] 190 parts of water, 155 parts of lightly burned magnesium powder, 40 parts of silica fume, 20 parts of magnesium chloride hexahydrate, 500 parts of natural aggregate, 520 parts of reinforced recycled aggregate, and 10 parts of admixture.

[0039] (1) Prepare recycled coarse aggregate and pretreat concrete fine particles;

[0040] (2) Prepare magnesium chloride solution, mix the fine concrete particles pretreated in step 1 with natural aggregates and reinforced recycled aggregates, and mix lightly burned magnesium and silica fume;

[0041] (3) Mix the material obtained in step 2 with the magnesium chloride solution evenly, add the admixture, stir evenly, and obtain super early strength recycled concrete after hardening.

Embodiment 3

[0042] Example 3 A super early strength recycled concrete and its preparation method

[0043] 180 parts of water, 150 parts of lightly burned magnesium powder, 30 parts of silica fume, 110 parts of magnesium chloride hexahydrate, 450 parts of natural aggregate, 1470 parts of reinforced recycled aggregate, and 8 parts of admixture.

[0044] (1) Prepare recycled coarse aggregate and pretreat concrete fine particles;

[0045] (2) Prepare magnesium chloride solution, mix the fine concrete particles pretreated in step 1 with natural aggregates and reinforced recycled aggregates, and mix lightly burned magnesium and silica fume;

[0046] (3) Mix the material obtained in step 2 with the magnesium chloride solution evenly, add the admixture, stir evenly, and obtain super early strength recycled concrete after hardening.

[0047] The proportions of components used in Comparative Examples 1-3 are the same as those in Examples 1-3, natural coarse aggregate is used instead of reinforced ...

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Abstract

The invention belongs to the technical field of building materials, and discloses super-early-strength recycled concrete and a preparation method thereof. The recycled concrete is prepared from the following raw materials in parts by weight: 170-190 parts of water, 140-155 parts of caustic calcined magnesia powder, 20-40 parts of silica fume, 100-120 parts of magnesium chloride hexahydrate, 400-500 parts of natural aggregate, 1400-1520 parts of reinforced recycled aggregate and 6-10 parts of an admixture. The 3-d compressive strength of the super-early-strength recycled concrete can reach 70% or above of the 28-d compressive strength of the concrete, and the 7-d compressive strength of the super-early-strength recycled concrete can reach 90% of the 28-d compressive strength; and the 28-day compressive strength is close to the strength of ordinary Portland cement concrete, so engineering requirements can be completely met, the recycled concrete can be utilized to the maximum extent, resources are saved, and the environment is protected.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a recycled aggregate prepared by using residual concrete in a concrete mixer tank. Background technique [0002] At present, the demand for concrete in the world is increasing day by day with the acceleration of economic development and urbanization. The following problems are the consumption of a large amount of natural aggregates and the generation of a large amount of construction waste due to the demolition of concrete that has expired. Recycled aggregate concrete, referred to as recycled concrete, is a new type of concrete that is prepared from waste concrete blocks after crushing, cleaning, grading, etc., and is mixed with grading in a certain proportion to replace natural aggregate partially or completely. It can effectively realize the recycling and reuse of resources. [0003] The national patent (CN113354369A) discloses a high-strength recycled c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/30C04B20/02C04B18/16C04B14/04C04B111/20
CPCC04B28/30C04B20/023C04B18/16C04B14/042C04B2111/20C04B2111/00017C04B2201/50C04B9/00C04B18/146C04B2103/10C04B14/02Y02W30/91
Inventor 胡勇赵华关博文马子宸田乾邸文锦王爱鹏张硕文薛兴杰冯玉荣
Owner 江西秀川科技有限公司
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