Effect of glass powder on corrosion resistance of concrete in a sulfate-coupled freeze-thaw cycle environment

Abstract

Abstract: The coupled freeze-thaw cyclic corrosion tests of Na₂SO₄ solution with concentrations of 5%, 10%, and 15% were designed. The effect of glass powder on the corrosion resistance of concrete was analyzed, the effect of Na₂SO₄ solution concentration on the corrosion rate of concrete was revealed, and the effect of glass powder on the pore structure and interface transition zone (ITZ) properties of concrete was studied. The results showed that the glass powder significantly improves the corrosion resistance of concrete at a dosage of 0~10%, while the glass powder deteriorates the corrosion resistance of concrete when the dosage is greater than 15%. At the same time, when the concentration of Na₂SO₄ solution is greater than 7.5%, C_b, i_m, and S all increase with the increase of the concentration of Na₂SO₄ solution, which shows that the corrosion effect of Na₂SO₄ solution on concrete is enhanced with the increase of the concentration. After adding 5% and 10% glass powder, ITZ split tensile strength of concrete increases by13.17% and 10.89%, respectively, while ITZ width decreases by 15 μm and 5 μm, respectively compared with ordinary concrete.

Key words: Na₂SO₄ solution, glass powder, freezing expansion rate, pore structure

CLC Number:

TU528.1

LI Hong-wei, WANG Jin-man, WANG Xin, SHI Xu-dong, YANG Yan-hua. Effect of glass powder on corrosion resistance of concrete in a sulfate-coupled freeze-thaw cycle environment[J]. Journal of Lanzhou University of Technology, 2024, 50(5): 23-31.

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