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Recycled concrete and preparation method thereof

A technology of recycled concrete and recycled coarse aggregate, which is applied in the field of concrete, can solve problems such as the influence of recycled concrete compressive strength and the service life of recycled concrete, and achieve the purpose of increasing interface connection strength, improving compactness and durability, and improving compressive strength intensity effect

Inactive Publication Date: 2020-04-21
泸州临港思源混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the compressive strength of recycled concrete made with recycled aggregates is easily affected, and even affects the service life of recycled concrete

Method used

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  • Recycled concrete and preparation method thereof

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Effect test

Embodiment 1

[0062] A kind of regenerated concrete, by weight, comprises 150 parts of cement, 90 parts of water, 800 parts of modified recycled coarse aggregate, 400 parts of natural sand, 40 parts of fly ash, 80 parts of mineral powder, 50 parts of zeolite powder, 30 parts of epoxy resin, 4 parts of water reducing agent, 2 parts of air-entraining agent;

[0063] The preparation method of above-mentioned recycled concrete comprises the steps:

[0064] (1) The preparation method of modified recycled coarse aggregate comprises the steps:

[0065] S1: Take waste concrete, crush it, and sieve it to obtain recycled coarse aggregate with a particle size of 10-25mm;

[0066] S2: soak the regenerated coarse aggregate in step S1 in an acetic acid solution with a mass concentration of 2% for 1 hour, and then dry it;

[0067] S3: In parts by weight, mix 80 parts of polyvinyl alcohol, 60 parts of silica fume, 40 parts of sodium silicate and 800 parts of water, and then fully stir to obtain a modifie...

Embodiment 2

[0073] A kind of recycled concrete, by weight, comprises 215 parts of cement, 110 parts of water, 875 parts of modified recycled coarse aggregate, 465 parts of natural sand, 62.5 parts of fly ash, 90 parts of mineral powder, 95 parts of zeolite powder, 45 parts of epoxy resin, 7 parts of water reducer, 4 parts of air-entraining agent;

[0074] The preparation method of above-mentioned recycled concrete comprises the steps:

[0075] (1) The preparation method of modified recycled coarse aggregate comprises the steps:

[0076] S1: Take waste concrete, crush it, and sieve it to obtain recycled coarse aggregate with a particle size of 10-25mm;

[0077] S2: soak the regenerated coarse aggregate in step S1 in an acetic acid solution with a mass concentration of 4.5% for 1.5 hours, and then dry it;

[0078] S3: In parts by weight, fully stir 95 parts of polyvinyl alcohol, 85 parts of silica fume, 60 parts of sodium silicate and 900 parts of water to obtain a modified solution, whic...

Embodiment 3

[0084] A kind of recycled concrete, by weight, comprises 280 parts of cement, 130 parts of water, 950 parts of modified recycled coarse aggregate, 530 parts of natural sand, 85 parts of fly ash, 100 parts of mineral powder, 140 parts of zeolite powder, 60 parts of epoxy resin, 10 parts of water reducing agent, 6 parts of air-entraining agent;

[0085] The preparation method of above-mentioned recycled concrete comprises the steps:

[0086] (1) The preparation method of modified recycled coarse aggregate comprises the steps:

[0087] S1: Take waste concrete, crush it, and sieve it to obtain recycled coarse aggregate with a particle size of 10-25mm;

[0088] S2: soak the regenerated coarse aggregate in step S1 in an acetic acid solution with a mass concentration of 7% for 2 hours, and then dry it;

[0089] S3: In parts by weight, fully stir 110 parts of polyvinyl alcohol, 110 parts of silica fume, 80 parts of sodium silicate and 1000 parts of water to obtain a modified solutio...

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Abstract

The invention relates to recycled concrete and a preparation method thereof, and belongs to the technical field of concrete. The recycled concrete comprises (by weight): 150-280 parts of cement, 90-130 parts of water, 800-950 parts of modified recycled coarse aggregate, 400-530 parts of fine aggregate, 40-85 parts of fly ash, 80-100 parts of mineral powder, 50-140 parts of zeolite powder, 30-60 parts of epoxy resin, 4-10 parts of a water reducing agent and 2-6 parts of an air entraining agent. The preparation method of the modified recycled coarse aggregate comprises the following steps: S1, crushing and screening waste concrete to obtain recycled coarse aggregate; S2, soaking the recycled coarse aggregate obtained in the step S1 in an acetic acid solution with the mass concentration of 2-7%, and airing; S3, stirring 80-110 parts of polyvinyl alcohol, 60-110 parts of silica fume, 40-80 parts of sodium silicate and 800-1,000 parts of water to obtain a modified liquid; and S4, soaking the recycled coarse aggregate obtained in the step S2 in the modified liquid obtained in the step S3, taking out the soaked recycled coarse aggregate, and baking the recycled coarse aggregate to obtainthe modified recycled coarse aggregate. The recycled concrete provided by the invention has a good compressive strength effect.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a recycled concrete and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of our country, the construction industry has also developed rapidly, which makes the amount of concrete increase year by year. The ever-increasing demand for concrete requires massive mining of sand and gravel resources, resulting in a serious crisis of raw material resources in many areas. In my country, except for a small part of the waste concrete used as the foundation cushion of buildings and roads, most of it is transported to the suburbs and disposed of by stacking or landfilling, which not only occupies land resources, but also costs a lot of land and disposal costs every year. Huge, therefore, more and more people pay attention to recycled concrete. [0003] Recycled concrete refers to the waste concrete blocks that are crushed, cleaned, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B20/02C04B18/02C04B18/16C04B111/20
CPCC04B18/022C04B18/16C04B20/023C04B28/04C04B2111/20C04B2201/50C04B14/06C04B18/08C04B18/12C04B14/047C04B24/281C04B2103/302C04B2103/304C04B18/146C04B14/48Y02W30/91
Inventor 罗杨邓小飞张伟
Owner 泸州临港思源混凝土有限公司
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