Application of a kind of ECC material in the reinforcement of recycled aggregate, recycled reinforced aggregate and its preparation method and application

A technology for recycled aggregates and aggregates, applied in climate change adaptation, sustainable waste treatment, solid waste management, etc., can solve the problems of damaged recycled aggregates, high cost of chemical solutions, high mechanical energy consumption, etc.

Active Publication Date: 2020-08-28
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical strengthening method uses chemical slurry to impregnate, rinse, and dry the recycled aggregate to directly or indirectly fill the pores of the recycled aggregate, but this method can only repair the surface of the recycled aggregate, and the cost of the chemical solution is high It is also easy to cause secondary pollution, and has great limitations in terms of economy and practicability
The physical strengthening method uses mechanical equipment to further process the recycled aggregate, and removes the cement mortar and particle edges and corners adhered to the surface through mechanical actions such as mutual impact and grinding between the aggregates. However, the physical strengthening method uses more mechanical energy. And it will further damage the recycled aggregate and reduce its contribution to the mechanical properties of concrete

Method used

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  • Application of a kind of ECC material in the reinforcement of recycled aggregate, recycled reinforced aggregate and its preparation method and application
  • Application of a kind of ECC material in the reinforcement of recycled aggregate, recycled reinforced aggregate and its preparation method and application
  • Application of a kind of ECC material in the reinforcement of recycled aggregate, recycled reinforced aggregate and its preparation method and application

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preparation example Construction

[0035] In the present invention, the preparation method of the ECC material preferably comprises the following steps:

[0036] mixing cement and fly ash to obtain a first mixture;

[0037] Stirring the first mixture, water reducing agent and water for the first time to obtain the second mixture;

[0038] performing a second agitation of the second mixture and the PE fiber to obtain an ECC material;

[0039] The first stirring time is 4-5 minutes; the second stirring time is 1-2 minutes.

[0040] In the present invention, there is no special limitation on the stirring rates of the first stirring and the second stirring, and the stirring rates well-known to those skilled in the art can be used. The invention ensures good dispersion of PE fibers in the ECC material through step-by-step mixing.

[0041] The invention also provides a regenerated reinforced aggregate, which includes a regenerated aggregate and an ECC layer wrapped on the surface of the regenerated aggregate.

[...

Embodiment 1

[0052] Mix 0.795kg of cement and 0.265kg of fly ash to obtain the first mixture, mix and stir the first mixture, 25g of water reducer and 212g of water for 4.5min to obtain the second mixture, mix and stir the second mixture with 10g of PE fiber 1.5min to get the ECC material. Mix 21.2g of aluminum sulfate and 201g of water to obtain an aqueous solution of aluminum sulfate; mix and stir the obtained ECC material, 222.2g of aqueous solution of aluminum sulfate and 7kg of waste concrete for 1.5min to obtain recycled reinforced aggregate.

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Abstract

The invention belongs to the field of building material, and especially relates to applications of an ECC material in recycled aggregate reinforcement, a recycled reinforced aggregate, and a preparation method and applications. The ECC material is excellent in strain hardening characteristic after being hardened, and multiple crack cracking is caused under stretching effect, so that the ECC material is capable of improving the quality of recycled aggregate obviously. The recycled reinforced aggregate is disclosed, and comprises a recycled aggregate, and an ECC layer used for coating the surface of the recycled aggregate; the ECC layer is adopted to fill recycled aggregate pores and coat the surface, so that a compact interface transition zone is formed, and the mechanical properties of therecycled aggregate are improved. The preparation method is capable of improving concrete ductility, and increasing energy consumption level of concrete structures under static force and dynamic loading. It is shown by tests that the 28d crush index of the recycled reinforced aggregate is 12.21%, and 28d compressive strength reaches 49MPa.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to the application of an ECC material in the reinforcement of recycled aggregates, the recycled reinforced aggregate, its preparation method and application. Background technique [0002] In order to solve the problem of recycling a large amount of construction waste and waste of construction resources such as sand and gravel, a large amount of waste concrete in construction waste is crushed and processed into recycled aggregate, and the new concrete prepared by partially or completely replacing natural aggregate is called recycled concrete. Because the recycled aggregate obtained after waste concrete is simply crushed has many edges and corners, rough surface, and contains original hardened mortar in its components, its performance is significantly inferior to that of natural aggregate, and it is usually used to prepare low-grade concrete. In order to make th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/10C04B28/04C04B18/16
CPCC04B20/1077C04B28/04C04B20/1055C04B20/1033C04B20/1014C04B20/107C04B18/16C04B18/08C04B2103/302C04B16/0625Y02A30/30Y02W30/91
Inventor 邢锋周英武关志培郭孟环隋莉莉
Owner SHENZHEN UNIV
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