掺钢渣粉PVA纤维增强水泥基复合材料抗硫酸盐侵蚀性研究

苏骏; 范子康; 蔡新华; 肖沭

doi:10.11988/ckyyb.20230603

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长江科学院院报 ›› 2024, Vol. 41 ›› Issue (11) : 172-180. DOI: 10.11988/ckyyb.20230603

水工结构与材料

掺钢渣粉PVA纤维增强水泥基复合材料抗硫酸盐侵蚀性研究

苏骏 ¹ ,
范子康 ¹ ,
蔡新华 ² ,
肖沭 ¹

作者信息 +

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

SU Jun ¹ ,
FAN Zi-kang ¹ ,
CAI Xin-hua ² ,
XIAO Shu ¹

Author information +

文章历史 +

摘要

基于钢渣粉的固废再利用,通过掺入不同质量分数的钢渣粉制备PVA-ECC,采用干湿循环加速硫酸盐侵蚀试验、立方体抗压强度试验和轴拉试验,测定分析掺钢渣粉PVA-ECC在Na₂SO₄溶液(质量分数为5%)中的质量变化、抗压强度、拉伸性能等参数的演变规律,并采用微观扫描电镜(SEM)和X射线衍射仪进行微观形貌与物相分析,探究钢渣粉掺量对PVA-ECC耐硫酸盐侵蚀性能的影响。结果表明:掺钢渣粉PVA-ECC材料中钢渣粉掺量为20%时,质量损失曲线位于基准组以下;低掺量钢渣粉PVA-ECC表现出较好的耐腐蚀性,S20组抗压耐腐蚀系数分别为1.13、1.02、0.96;掺钢渣粉PVA-ECC试件均出现多缝开裂现象,钢渣粉的掺入能在一定程度上提高材料的抗拉强度,S40组最大提高了31.4%;适量钢渣粉的掺入能有效缓解PVA-ECC材料的侵蚀损伤,掺量不超过60%时在研究的龄期范围内材料未出现明显劣化。

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%.

导出引用

苏骏, 范子康, 蔡新华, 等. 掺钢渣粉PVA纤维增强水泥基复合材料抗硫酸盐侵蚀性研究[J]. 长江科学院院报. 2024, 41(11): 172-180 https://doi.org/10.11988/ckyyb.20230603

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

中图分类号： TU528 (混凝土及混凝土制品)

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