Effect of Sulfate Freeze-Thaw on Mechanical Properties of Self-Compacting Recycled Coarse Aggregate Concrete

HOU Yufei; ZHENG Chuanlei; ZHAO Yadi; JIN Baohong

doi:10.13204/j.gyjzG22111001

Volume 53 Issue 7

Jul. 2023

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Article Navigation > INDUSTRIAL CONSTRUCTION > 2023 > 53(7): 189-198,6

HOU Yufei, ZHENG Chuanlei, ZHAO Yadi, JIN Baohong. Effect of Sulfate Freeze-Thaw on Mechanical Properties of Self-Compacting Recycled Coarse Aggregate Concrete[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(7): 189-198,6. doi: 10.13204/j.gyjzG22111001

Citation:

HOU Yufei, ZHENG Chuanlei, ZHAO Yadi, JIN Baohong. Effect of Sulfate Freeze-Thaw on Mechanical Properties of Self-Compacting Recycled Coarse Aggregate Concrete[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(7): 189-198,6. doi: 10.13204/j.gyjzG22111001

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Effect of Sulfate Freeze-Thaw on Mechanical Properties of Self-Compacting Recycled Coarse Aggregate Concrete

doi: 10.13204/j.gyjzG22111001

1. Xinhua College, Ningxia University, Yinchuan 750021, China;
2. School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China

Received Date: 2022-11-10

Abstract

Abstract

The effect of recycled coarse aggregate (RCA) replacement ratios, freeze-thaw environments and freeze-thaw cycles on the mechanical properties of self-compacting recycled coarse aggregate concrete (SCRCAC) were studied by rapid freeze-thaw cycle method. The results showed that when the RCA replacement ratios were the same, the compressive strength, splitting tensile strength and uniaxial compressive strength loss ratio of SCRCAC after being subjected to 125 freeze-thaw cycles were the smallest in the freeze-thaw environment of clear water, and the maximum in the 5% mass fraction MgSO₄ solution freeze-thaw environment. Sulfate could inhibit freeze-thaw damage at the initial stage of freeze-thaw. At the late stage of freeze-thaw, the relation curves of compressive strength and freeze-thaw cycles of SCRCAC gradually spearated from that curves of ordinary concrete in different freeze-thaw environments and RCA replacement ratios. Based on that, a new relation between the splitting tensile force and the uniaxial compressive force was presented, better predicted the damage and deterioration law of SCRCAC after freeze-thawing of sulfate. The established strength prediction model showed that the model had high accuracy. Grey entropy correlation analysis showed that the effect of freeze-thaw cycles on compressive strength and splitting tensile strength was greater than that of RCA replacement ratios in the freeze-thaw environment of clear water, in the solution of 5% mass fraction of Na₂SO₄, and in the solution of 5% mass fraction of Na₂SO₄ and 5% mass fraction of MgSO₄. However, contrary to the situation of the solution of 5% mass fraction of MgSO₄. The effect of freeze-thaw cycles on the uniaxial compressive strength was larger than the RCA replacement ratio in clear water.
- self-compacting recycled coarse aggregate concrete,
- transformation relation,
- freeze-thaw damage model,
- strength prediction model,
- run test,
- grey entropy correlation analysis

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References

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