Effect of glass powder on corrosion resistance of concrete in a sulfate-coupled freeze-thaw cycle environment
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 ana-lyzed,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 con-crete 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％,Cb,im,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 concen-tration.After adding 5％and 10％glass powder,ITZ split tensile strength of concrete increases by 13.17％and 10.89％,respectively,while ITZ width decreases by 15 μm and 5 μm,respectively compared with ordinary concrete.
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