Sulfate Resistance of Steel Slag Powder PVA Fiber-Reinforced Cement Composite Material

SU Jun, FAN Zi-kang, CAI Xin-hua, XIAO Shu

Journal of Changjiang River Scientific Research Institute ›› 2024, Vol. 41 ›› Issue (11) : 172-180.

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Journal of Changjiang River Scientific Research Institute ›› 2024, Vol. 41 ›› Issue (11) : 172-180. DOI: 10.11988/ckyyb.20230603

Sulfate Resistance of Steel Slag Powder PVA Fiber-Reinforced Cement Composite Material

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Abstract

To explore the reuse of steel slag powder in PVA-ECC (Polyvinyl Alcohol Engineered Cementitious Composite), we produced PVA-ECC samples by incorporating steel slag powder at various mass fractions. We measured the mass change, compressive strength, and tensile performance of the test samples in Na2SO4 solution (with a mass fraction of 5%) during dry-wet cycle accelerated sulfate attack tests, cubic compressive strength tests, and axial tensile tests. By microstructural and phase analysis using scanning electron microscopy (SEM) and X-ray diffraction (XRD) meter, we examined the influence of steel slag powder content on the sulfate resistance of PVA-ECC. Results indicate that when the steel slag powder content in PVA-ECC reaches 20%, the mass loss remains lower than that of the reference group. PVA-ECC with a low dosage of steel slag powder demonstrates sound corrosion resistance, with compressive and corrosion resistance coefficients of 1.13, 1.02, and 0.96 for the S20 group, respectively. PVA-ECC specimens containing steel slag powder exhibited multiple cracks; however, the addition of steel slag powder enhanced tensile strength, with a maximum increase of 31.4% observed in the S40 group. The inclusion of an appropriate amount of steel slag powder effectively mitigates corrosion damage, with no significant material deterioration observed within the studied age range when the addition does not exceed 60%.

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PVA fiber / steel slag powder / sulfate attack / dry-wet cycle / tensile strength / durability performance

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SU Jun , FAN Zi-kang , CAI Xin-hua , et al. Sulfate Resistance of Steel Slag Powder PVA Fiber-Reinforced Cement Composite Material[J]. Journal of Yangtze River Scientific Research Institute. 2024, 41(11): 172-180 https://doi.org/10.11988/ckyyb.20230603

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