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  

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

作　　者：苏骏 范子康 蔡新华[2] 肖沭 SU Jun;FAN Zi-kang;CAI Xin-hua;XIAO Shu(School of Civil Engineering and Environment,Hubei University of Technology,Wuhan 430068,China;State Key Laboratory of Water Resources&Hydropower Engineering Science,Wuhan University,Wuhan 430072,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,武汉430068 [2]武汉大学水资源与水电工程科学国家重点实验室,武汉430072

出　　处：《长江科学院院报》2024年第11期172-180,共9页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金面上项目(52178247);湖南省水利科技项目(XSKJ2021000-15)。

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Na_(2)SO_(4)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。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 Na_(2)SO_(4)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%.

关 键 词：PVA纤维 钢渣粉 硫酸盐侵蚀 干湿循环 拉伸强度 耐久性能 

分 类 号：TU528[建筑科学—建筑技术科学]