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Preparation method of strengthened recycled aggregate and strengthened recycled aggregate concrete

A technology of recycled aggregate and concrete, which is applied in the field of the preparation of reinforced recycled aggregate and the field of reinforced recycled aggregate concrete, can solve the problems of restricting the development and application of load-bearing components and structures, high equipment requirements, limited improvement effect, etc., and achieves chloride ion diffusion. The effect of reducing the coefficient and shrinkage value, expanding the scope of application, and reducing resource consumption

Inactive Publication Date: 2017-03-08
SHANGHAI RES INST OF BUILDING SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface of recycled aggregate is covered with a considerable amount of cement mortar, with many edges and corners and rough surface. At the same time, external mechanical forces such as crushing cause certain defects or microcracks inside. Compared with natural aggregate, it has higher porosity and higher water absorption. , low strength, the fluidity of the prepared recycled concrete is worse than that of ordinary concrete, and its performance is significantly lower than that of ordinary concrete, which limits its development and application in load-bearing components and structures
[0004] A variety of technical means have been developed at home and abroad to strengthen recycled aggregates, such as the production of high-quality recycled aggregates through mechanical grinding and heating grinding of recycled aggregates, and the use of cement with Kim powder, pure cement slurry, and cement with pulverized coal Ash, cement mixed with silica fume, polyvinyl alcohol, etc. are used to impregnate and rinse recycled aggregates to improve the performance of recycled aggregates. Some of these methods have relatively high requirements for equipment, some have limited improvement effects, and some have increased Water absorption of recycled aggregates, reducing workability and mechanical properties of recycled concrete

Method used

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  • Preparation method of strengthened recycled aggregate and strengthened recycled aggregate concrete
  • Preparation method of strengthened recycled aggregate and strengthened recycled aggregate concrete
  • Preparation method of strengthened recycled aggregate and strengthened recycled aggregate concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of reinforced recycled aggregate: soak the recycled aggregate in a water glass solution with a mass concentration of 3%-20% and a modulus of 3.0-3.4, the solution is submerged in the recycled aggregate, and the soaking time is 10min-5h , take out the soaked recycled aggregates to dry naturally, dry and store them, and then get strengthened recycled aggregates. Table 1 shows the water absorption rate and crushing index of the recycled aggregate obtained by using different mass concentrations of water glass solutions for different soaking times.

[0021]

Embodiment 2

[0023] A preparation method of reinforced recycled aggregate: soak the recycled aggregate in a solution of potassium methyl silicate with a mass concentration of 1% to 15%, the solution is submerged in the recycled aggregate, and the soaking time is 5 to 10 minutes, and the soaked The recycled aggregates are taken out and dried naturally, and stored dryly to obtain strengthened recycled aggregates. Table 2 shows the water absorption rate and crushing index of the recycled aggregate obtained by using different mass concentrations of potassium methyl silicate solutions for different soaking times.

[0024]

Embodiment 3

[0029] Use recycled aggregate (soaked in 5% water glass solution for 1h to strengthen treatment) to prepare recycled concrete, per m 3 Concrete includes the following raw materials by weight: 1016kg recycled aggregate, 223kg cement, 62kg fly ash, 68kg mineral powder, 800kg fine aggregate and 2.82kg water reducer. The slump of recycled concrete is controlled at (180±20) mm.

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Abstract

The invention discloses a preparation method of strengthened recycled aggregate and strengthened recycled aggregate concrete. The preparation method comprises the following steps: recycled aggregate is completely soaked in a water glass solution with the mass concentration being 3%-20% and the modulus being 3.0-3.4 for 10 min-5h; alternatively, the recycled aggregate is completely soaked in a potassium methyl silicate with the mass concentration being 1%-15% for 5-10 min. By comparison with recycled aggregate concrete in the prior art, the work performance, the compressive strength and the chloride penetration resistance of the soaked recycled aggregate concrete are all remarkably improved; the recycled aggregate is fished out, dried in air naturally and stacked, and the strengthened recycled aggregate can be obtained. The method has a good modification effect and is low in cost and environment-friendly; the water absorption rate of the strengthened recycled aggregate can be reduced by 50% or higher, and the crush index is reduced 20%. The shrinking percentage of the strengthened recycled aggregate is remarkably reduced, and the freezing resistance is good.

Description

technical field [0001] The invention relates to the technical field of solid waste resource utilization technology and building materials, in particular to a preparation method of reinforced recycled aggregate and reinforced recycled aggregate concrete. Background technique [0002] With the continuous acceleration of economic construction and social development, the amount of construction waste generated by my country's construction industry has grown rapidly. According to statistics, in 2013, the amount of construction waste generated in my country reached 1 billion tons, while the utilization rate was only 5%, and a large amount of construction waste accumulated It has caused extremely bad impacts on my country's economy, environmental development and residents' lives. At the same time, the construction industry is a large-scale resource-consuming industry. While producing a large amount of construction waste, it also has the potential to absorb and utilize a large amount ...

Claims

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Application Information

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IPC IPC(8): C04B20/10C04B28/04C04B18/16
CPCC04B20/1074C04B28/04C04B2201/50C04B18/167C04B18/08C04B18/12C04B14/068C04B2103/302Y02W30/91
Inventor 杨利香钱耀丽汤立杰
Owner SHANGHAI RES INST OF BUILDING SCI CO LTD
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