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Nanometer strengthening method of recycled aggregate concrete and obtained strengthened recycled aggregate

A technology of recycled aggregate and recycled coarse aggregate, applied in the field of strengthening recycled aggregate, can solve problems such as economic decline, and achieve the effect of low cost and increased strength

Inactive Publication Date: 2020-11-03
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, a variety of technical means have been developed at home and abroad to improve the performance of recycled aggregate concrete, such as the use of direct grinding and shaping, thermo-mechanical grinding and shaping separation, acid liquid pre-soaking and other technical means to produce high-quality recycled aggregates, and the use of low water-cement ratio Clean slurry or highly active admixtures are pre-coated and dried to achieve recycled aggregate reinforcement. These technological measures can improve the performance of recycled aggregate concrete to varying degrees, but due to the addition of recycled aggregate surface strengthening process, its economical greatly reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Recycled coarse aggregate with a particle size of 5-25mm obtained by crushing and sieving waste concrete through a jaw crusher;

[0036] Before mixing concrete, first use nano-calcium carbonate solution, dispersant and water to prepare a solution with a concentration of 5% nano-calcium carbonate and a dispersant content of 1%, and then soak the recycled aggregate in the solution for 45 minutes, and then put the recycled aggregate Take it out to make the surface wet (the water absorption rate of the aggregate is measured to be 7.3%), then stir with the cementitious material for 25s, then add sand and cementitious material, stir for another 25s, then add water and high-efficiency water reducer The mixed solution was stirred for 2 minutes to obtain the recycled aggregate concrete.

[0037] Among them, the amount of cement is 287.2kg / m 3 , the sand content is 636kg / m 3 , the amount of coarse aggregate is 1233kg / m 3 , the amount of fly ash is 71.8kg / m, and the amount of w...

Embodiment 2

[0039] Recycled coarse aggregate with a particle size of 5-25mm obtained by crushing and sieving waste concrete through a jaw crusher;

[0040] Before mixing concrete, first use nano-calcium carbonate solution, dispersant and water to prepare a solution with a concentration of 8%, and a dispersant content of 1%, and then soak the recycled aggregate in the solution for 45 minutes, and then take out the recycled aggregate to make it The surface is in a wet state (the water absorption rate of the aggregate at this time is determined to be 12.6%), then stir with the cementitious material for 25s, then add sand and cementitious material, stir for another 25s, then add the mixed solution of water and high-efficiency water reducer to stir The recycled aggregate concrete was obtained in 2 minutes.

[0041] Among them, the amount of cement is 278.4kg / m 3 , the sand content is 636kg / m 3 , the amount of coarse aggregate is 1233kg / m 3 , the amount of fly ash is 69.6kg / m, and the amount...

Embodiment 3

[0043] Recycled coarse aggregate with a particle size of 5-25mm obtained by crushing and sieving waste concrete through a jaw crusher;

[0044] Before mixing concrete, first prepare a solution with a concentration of 10% and 1% dispersant with nano-calcium carbonate solution, dispersant and water, then soak the recycled aggregate in the solution for 45 minutes, and then take out the recycled aggregate to make it The surface is in a wet state (the water absorption rate of the aggregate is determined to be 9.6%), then stir with the cementitious material for 25s, then add sand and cementitious material, stir for another 25s, then add the mixed solution of water and high-efficiency water reducer and stir The recycled aggregate concrete was obtained in 2 minutes.

[0045] Among them, the amount of cement is 317kg / m 3 , the sand content is 636kg / m 3 , the amount of coarse aggregate is 1233kg / m 3 , the amount of fly ash is 63.4kg / m, and the amount of water reducer is 3.8kg / m 3 , ...

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Abstract

The invention belongs to the technical field of building materials, and particularly relates to a nanometer strengthening method of recycled aggregate concrete and obtained strengthened recycled aggregate. The method comprises the following steps: 1) soaking a recycled coarse aggregate raw material in a nano calcium carbonate solution until the recycled coarse aggregate raw material absorbs waterto be saturated, and then taking out the recycled coarse aggregate to obtain recycled coarse aggregate of which the surface is in a wet state; 2) uniformly mixing and stirring the recycled coarse aggregate of which the surface is in a wet state with part of the cementing material; and (3) then adding sand and the remaining cementing material, uniformly stirring, and finally adding a mixed solutionof water and a high-efficiency water reducing agent for mixing, so as to obtain the recycled aggregate concrete. Micro-cracks and open pores of the recycled aggregate are filled by utilizing the characteristics of fine particles and high permeability of the nano material, so that the strength of the recycled aggregate is improved, and the interface strength between the recycled aggregate and cement mortar is improved and enhanced through a secondary stirring process and a fly ash material.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a nano-strengthening method of recycled aggregate concrete and the obtained reinforced recycled aggregate. Background technique [0002] At present, a variety of technical means have been developed at home and abroad to improve the performance of recycled aggregate concrete, such as the use of direct grinding and shaping, thermo-mechanical grinding and shaping separation, acid liquid pre-soaking and other technical means to produce high-quality recycled aggregates, and the use of low water-cement ratio Clean slurry or highly active admixtures are pre-coated and dried to achieve recycled aggregate reinforcement. These technological measures can improve the performance of recycled aggregate concrete to varying degrees, but due to the addition of recycled aggregate surface strengthening process, its economical greatly reduced. [0003] In recycled aggregate c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B20/10C04B18/16
CPCC04B20/107C04B28/00C04B18/08C04B14/06C04B18/16C04B2103/302Y02W30/91
Inventor 陈旭勇吴巧云田野樊建平
Owner WUHAN INSTITUTE OF TECHNOLOGY