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Method for improving high temperature resistance and freeze thawing resistance of high strength recycled concrete

A technology of recycled concrete and high temperature resistance, which is applied in the field of improving the high temperature resistance and freeze-thaw performance of high-strength recycled concrete

Active Publication Date: 2019-09-17
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It has been disclosed in the prior art that adding basalt fiber to recycled concrete can improve its high temperature resistance and freeze-thaw performance, but the upper limit of its high temperature resistance is only about 400 degrees, and it is aimed at low- and medium-strength concrete. For high-strength concrete Basalt fiber recycled concrete is not involved

Method used

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  • Method for improving high temperature resistance and freeze thawing resistance of high strength recycled concrete
  • Method for improving high temperature resistance and freeze thawing resistance of high strength recycled concrete
  • Method for improving high temperature resistance and freeze thawing resistance of high strength recycled concrete

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Experimental program
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Effect test

Embodiment 1

[0025] 1) The waste concrete or construction waste is crushed and screened to obtain recycled coarse aggregate with a particle size of 2.36mm;

[0026] 2) After washing the recycled coarse aggregate obtained in step 1) with water, soak in water for 24 hours;

[0027] 3) Mix sand, cement and fly ash and then mix, mix basalt fibers in batches during the mixing to obtain Mixture I, then add coarse aggregate and water to Mixture I, and after fully mixing, pour the concrete ;

[0028] The mixing amount of the basalt fiber is 0.5kg / m 3 ;

[0029] The amounts of water, cement, fly ash, water reducing agent, sand and coarse aggregate are respectively 5.15 parts by weight, 13.72 parts of cement, 3.43 parts of fly ash, 0.0515 parts of water reducing agent, and 21.35 parts of sand. And 43.4 parts of coarse aggregate;

[0030] The coarse aggregate is composed of natural coarse aggregate and recycled coarse aggregate;

[0031] 4) The concrete described in step 3) is cured for the first time under t...

Embodiment 2

[0033] 1) The waste concrete or construction waste is crushed and sieved to obtain recycled coarse aggregate with a particle size of 10mm;

[0034] 2) After washing the recycled coarse aggregate obtained in step 1) with water, soak in water for 48 hours;

[0035] 3) Mix sand, cement and fly ash and then mix, mix basalt fibers in batches during the mixing to obtain Mixture I, then add coarse aggregate and water to Mixture I, and after fully mixing, pour the concrete ;

[0036] The blending amount of the basalt fiber is 4kg / m 3 ;

[0037] The amounts of water, cement, fly ash, water reducing agent, sand and coarse aggregate are 5.4 parts by weight, 14.56 parts of cement, 3.64 parts of fly ash, 0.0546 parts of water reducing agent, and 21.7 parts of sand, respectively. And 44.1 parts of coarse aggregate;

[0038] The coarse aggregate is composed of natural coarse aggregate and recycled coarse aggregate;

[0039] 4) The concrete described in step 3) is cured for the first time under the co...

Embodiment 3

[0041] 1) The waste concrete or construction waste is crushed and screened to obtain recycled coarse aggregate with a particle size of 19mm;

[0042] 2) After washing the recycled coarse aggregate obtained in step 1) with water, soak in water for 72 hours;

[0043] 3) Mix sand, cement and fly ash and then mix, mix basalt fibers in batches during the mixing to obtain Mixture I, then add coarse aggregate and water to Mixture I, and after fully mixing, pour the concrete ;

[0044] The blending amount of the basalt fiber is 5kg / m 3 ;

[0045] The amounts of water, cement, fly ash, water reducing agent, sand and coarse aggregate are 5.4 parts by weight, 14.56 parts of cement, 3.64 parts of fly ash, 0.0546 parts of water reducing agent, and 21.7 parts of sand, respectively. And 44.1 parts of coarse aggregate;

[0046] The coarse aggregate is composed of natural coarse aggregate and recycled coarse aggregate;

[0047] 4) The concrete described in step 3) is cured for the first time under the ...

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Abstract

The invention discloses a method for improving high temperature resistance and freeze thawing resistance of high strength recycled concrete. The method for improving durability of the high strength recycled concrete at high temperature (as high as 800 DEG C) and in an extreme freeze thawing environment (100 freezing and thawing cycles highest) is mainly realized by a method of the mixing of basalt fibres and later maintenance. The improvement of the freeze thawing resistance, permeability resistance and high temperature resistance of the concrete is facilitated by mixing the basalt fibres in the concrete, and environment damage and crack initiation and expansion under exogenic action of the concrete can be inhibited. When the mixing amount of the fibres is 4 kg / m<3>, the strength development of the recycled concrete is the fastest and stable, the strength is relatively high with 28 days of maintenance, the quality loss of the fiber recycled concrete is less than 1% after 100 times of freeze thawing, and the strength of plain concrete columns is relatively high after freeze thawing; 24 hours of underwater maintenance is beneficial to the strength recovery of the fiber recycled concrete after high temperature loss, and when the high temperature is less than 600 DEG C, the strength can recover to a same level.

Description

Technical field [0001] The invention belongs to the field of reinforced treatment of recycled concrete, and specifically relates to a method for improving high-strength recycled concrete's high temperature resistance and freeze-thaw performance. Background technique [0002] Recycled concrete refers to the process of crushing, cleaning, and grading discarded concrete blocks and mixing them with the gradation in a certain proportion, partially or completely replacing natural aggregates (mainly coarse aggregates) such as sand and gravel, and adding cement, water, etc. Made of new concrete. Basalt fiber is a continuous fiber made from natural basalt ore after being melted at 1450-1500°C and drawn through a platinum-rhodium alloy drawing slip plate at high speed. It has many excellent properties such as electrical insulation, corrosion resistance, and high temperature resistance. It can effectively To enhance the ability of concrete to resist crack initiation and expansion, it is lis...

Claims

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Application Information

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IPC IPC(8): C04B28/02C04B40/02C04B111/20
CPCC04B28/02C04B2111/20C04B2201/50C04B18/08C04B18/16C04B14/06C04B2103/302C04B14/02C04B40/0281C04B40/0286C04B40/0263C04B14/46
Inventor 董江峰袁书成贾璞王清远
Owner SICHUAN UNIV
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