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Modification method of recycled aggregate

A technology of recycled aggregate and modification, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., to achieve the effect of simple operation, saving natural resources, and low water absorption

Active Publication Date: 2019-11-22
广西壮族自治区水利科学研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of existing recycled aggregates in recycling, the present invention provides a modification method of low-cost recycled aggregates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for modifying recycled aggregates, comprising the steps of:

[0025] (1) Treat the recycled aggregate with particle shaping equipment to remove the protruding edges and corners on the particles and remove the mortar and cement stone attached to the surface of the particles to obtain a recycled aggregate with a cleaner surface and fewer edges and corners;

[0026] (2) Soak the regenerated aggregate treated by the shaping equipment in the chemical solution of diatomite mixed with cement slurry with a water-cement ratio of 1.1:1 and a content of 30% diatomite, and stir continuously. After it is fully impregnated, stir once every half an hour, and when the slurry is roughly set, remove the aggregate from the chemical slurry, rinse and drain;

[0027] (3) Add polyvinyl alcohol solution with a mass concentration of 9% to the drained recycled aggregate, the liquid level is 1 to 2 cm higher than the aggregate, keep it aside for 1 minute after every 2 minutes of stirrin...

Embodiment 2

[0029] A method for modifying recycled aggregates, comprising the steps of:

[0030] (1) Treat the recycled aggregate with particle shaping equipment to remove the protruding edges and corners on the particles and remove the mortar and cement stone attached to the surface of the particles to obtain a recycled aggregate with a cleaner surface and fewer edges and corners;

[0031] (2) Soak the regenerated aggregate treated by the shaping equipment in the chemical solution of diatomite mixed with cement slurry with a water-cement ratio of 1.1:1 and a diatomite content of 25%, and stir continuously. After it is fully impregnated, stir once every half an hour, and when the slurry is roughly set, remove the aggregate from the chemical slurry, rinse and drain;

[0032] (3) Add polyvinyl alcohol solution with a mass concentration of 6% to the drained recycled aggregate, the liquid level is 1 to 2 cm higher than the aggregate, let it stand for 1 minute after stirring for 2 minutes, and...

Embodiment 3

[0034] A method for modifying recycled aggregates, comprising the steps of:

[0035] (1) Treat the recycled aggregate with particle shaping equipment to remove the protruding edges and corners on the particles and remove the mortar and cement stone attached to the surface of the particles to obtain a recycled aggregate with a cleaner surface and fewer edges and corners;

[0036] (2) Soak the regenerated aggregate treated by the shaping equipment in the chemical solution of diatomite mixed with cement slurry with a water-cement ratio of 1.1:1 and a diatomite content of 20%, and stir continuously. After it is fully impregnated, stir once every half an hour, and when the slurry is roughly set, remove the aggregate from the chemical slurry, rinse and drain;

[0037] (3) Add polyvinyl alcohol solution with a mass concentration of 8% to the drained recycled aggregate, the liquid level is 1 to 2 cm higher than the aggregate, let stand for 1 minute after every 2 minutes of stirring, a...

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Abstract

The invention discloses a modification method of recycled aggregate, which comprises the following steps: treating the recycled aggregate by particle shaping equipment to remove protruding edges and corners on particles and mortar and set cement attached to the surfaces of the particles; soaking the recycled aggregate treated by the shaping equipment into cement paste infiltrated with kieselguhr and moving out, leaching and draining the recycled aggregate when the slurry is initially set; and adding a polyvinyl alcohol solution into the drained recycled aggregate, performing circular stirring,taking out and naturally air-drying the recycled aggregate to obtain the modified recycled aggregate. The method is simple to operate and low in cost, can improve the working performance, the mechanical property and the durability of the recycled aggregate to the maximum extent, has the characteristics of low porosity and low water absorption, and enlarges the utilization rate of the recycled aggregate in high-performance concrete.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a method for modifying recycled aggregate. Background technique [0002] With the continuous advancement of my country's reform and opening up and urbanization, more and more old buildings and abandoned cement pavements have been demolished, resulting in a large amount of waste concrete construction waste. Because there is no better technology for recycling waste concrete, these Construction waste seriously encroached on the land space; at the same time, in the process of promoting urbanization, a large amount of natural aggregates were consumed, and high-quality natural aggregates were on the verge of depletion, driving the price of natural sand and gravel to rise continuously, increasing the cost of the project to a certain extent. construction costs. [0003] Recycling and reusing construction waste has become a difficult problem that the whole society needs to solve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/12C04B20/02C04B18/16
CPCC04B18/16C04B20/02C04B20/12C04B20/1077C04B20/1033Y02W30/91
Inventor 李林刘鲁强陈建国李若愚黄卓杰吴俣萍甘福陈美琴
Owner 广西壮族自治区水利科学研究院
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