Recycled aggregate based on metakaolin slurry soaking and modification method of recycled aggregate

A metakaolin and recycled aggregate technology, applied in the field of building materials, can solve the problems of low strength, poor compatibility between organic polymers and concrete, and low water absorption, and achieve low cost, good economic and social benefits, and reduced The effect of environmental burden

Active Publication Date: 2021-07-30
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are some shortcomings in the above methods, such as alkali-silicon reaction, poor compatibility between organic polymers and concrete, etc. Therefore, it is necessary to develop an efficient and novel aggregate modification method to make recycled aggregate overcome the strength. The problem of low water absorption and low water absorption makes recycled aggregate meet the requirements of current buildings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] S1, prepare raw materials, by weight, weigh 60 parts of metakaolin, 30 parts of fly ash, 30 parts of silica fume, 0.5 parts of water reducer, 2 parts of 40% NaOH solution, 2 parts of 10% concentration of water glass solution , 35 parts of water;

[0034] S2. Mix metakaolin, fly ash and silica fume according to the stated ratio and put them into the mixer, stir evenly to obtain a dry mixture;

[0035] S3. Put water, water reducing agent, alkaline activator and water glass solution into the capacity bucket according to the proportion, mix and stir evenly to obtain the mixed solution;

[0036] S4. After mixing the dry mixture prepared in S2 and the mixed solution prepared in S3 in proportion and stirring evenly, a metakaolin slurry is obtained;

[0037] S5, get the regenerated coarse aggregate of 5-25mm in particle size, put into water and soak for 24h, filter out, take 2kg of regenerated coarse aggregate to measure water absorption, then soak the regenerated coarse aggre...

Embodiment 2

[0040] S1. Prepare raw materials, by weight, respectively weigh 70 parts of metakaolin, 40 parts of fly ash, 40 parts of silica fume, 0.8 parts of water reducer, 2.5 parts of 40% NaOH solution, and 2.2 parts of 10% concentration of water glass solution , 40 parts of water;

[0041] S2. Mix metakaolin, fly ash and silica fume according to the stated ratio and put them into the mixer, stir evenly to obtain a dry mixture;

[0042] S3. Put water, water reducing agent, alkaline activator and water glass solution into the capacity bucket according to the proportion, mix and stir evenly to obtain the mixed solution;

[0043] S4. After mixing the dry mixture prepared in S2 and the mixed solution prepared in S3 in proportion and stirring evenly, a metakaolin slurry is obtained;

[0044] S5, get the regenerated coarse aggregate of 5-25mm in particle size, put into water and soak for 24h, filter out, take 2kg of regenerated coarse aggregate to measure water absorption, then soak the reg...

Embodiment 3

[0047] S1, prepare raw materials, weigh 80 parts of metakaolin, 50 parts of fly ash, 50 parts of silica fume, 1.1 parts of water reducer, 3 parts of 40% concentration NaOH solution, 2.8 parts of 10% concentration water glass solution by weight , 50 parts of water;

[0048] S2. Mix metakaolin, fly ash and silica fume according to the stated ratio and put them into the mixer, stir evenly to obtain a dry mixture;

[0049] S3. Put water, water reducing agent, alkaline activator and water glass solution into the capacity bucket according to the proportion, mix and stir evenly to obtain the mixed solution;

[0050] S4. After mixing the dry mixture prepared in S2 and the mixed solution prepared in S3 in proportion and stirring evenly, a metakaolin slurry is obtained;

[0051] S5, get the regenerated coarse aggregate of 5-25mm in particle size, put into water and soak for 24h, filter out, take 2kg of regenerated coarse aggregate to measure water absorption, then soak the regenerated ...

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Abstract

The invention belongs to the technical field of building materials, and relates to a modification method of a recycled aggregate based on metakaolin slurry soaking. The modification method mainly comprises the following steps of: preparing raw materials, specifically, separately weighing 60-90 parts by weight of metakaolin, 30-65 parts by weight of fly ash, 30-65 parts by weight of silica fume, 0.5-1.5 parts by weight of a water reducing agent, 2-3.5 parts by weight of an alkali activator, 2-3 parts by weight of a water glass solution and 35-60 parts by weight of water; uniformly mixing and stirring the metakaolin, the fly ash and the silica fume according to proportions to obtain a dry mixture; mixing water, a water reducing agent, an alkaline exciting agent and a water glass solution in proportion, and uniformly stirring to obtain a mixed solution; mixing the dry mixture with the mixed solution in proportion, and uniformly stirring to obtain metakaolin slurry; pretreating recycled coarse aggregate, soaking the recycled coarse aggregate in the metakaolin slurry, filtering out the recycled coarse aggregate after the recycled coarse aggregate absorbs water to be saturated, and drying to obtain the modified recycled aggregate. According to the method, existing waste can be utilized to the maximum extent, and resource utilization of industrial waste can be achieved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and more specifically, the invention relates to a method for modifying recycled aggregate based on metakaolin slurry soaking. Background technique [0002] With the large-scale urbanization, a large number of buildings have been demolished, resulting in a large amount of construction waste that cannot be consumed. Construction waste includes muck, waste concrete, waste masonry and other waste. In the prior art, the main treatment methods of construction demolition waste are in-situ landfill, roadbed utilization, and the use of recycled aggregates to make recycled bricks and produce recycled concrete. Among them, using construction waste to produce recycled aggregates and adding cement, fly ash and other auxiliary materials to produce a variety of construction products is a more environmentally friendly and economical way. However, the recycled aggregate prepared from construction was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/10
CPCC04B20/1081C04B18/16C04B20/1055C04B20/1066C04B20/1074
Inventor 覃铃玲刘珺涵罗仁刘怀李婉淋
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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