掺石灰石粉-粉煤灰胶砂抗硫酸盐侵蚀及机理分析.pdfVIP

学兔兔 中国科技核心期刊 新癯建巍 执 掺石灰石粉一粉燥灰胶砂抗硫酸盐 侵蚀及机理分析 袁庆莲，金勇刚，王勇飞 (湖南省建筑科学研究院，湖南 长沙 410007) 摘要：通过测试水泥胶砂不同龄期抗蚀系数变化，研究了单掺石灰石粉、粉煤灰以及石灰石粉与粉煤灰双掺对水泥胶砂抗硫酸 盐侵蚀性能的影响，结合测定硫酸根离子含量并采用XRD微观分析手段对其进行了机理分析。研究结果表明，随石灰石粉掺量增 加试件中硫酸根离子含量增加；粉煤灰的掺入能减少胶砂试件硫酸根离子含量。掺石灰石粉胶砂试件在5％Na2fiO 溶液中浸泡8个 月，发现了膨胀产物石膏。 关键词：石灰石粉：粉煤灰；胶砂；抗蚀系数；硫酸根离子含量；XRD 中图分类号：TU528 文献标识码：A 文章编号：1001—702X(2013)11-0022—05 Effect and mechanism analysis of ground limestone and fly ash on the sulfate attack of cement mortar YUAN Qinglian，JIN Yonggang，WANG Yon~fei (Hunan Academy of Building Research，Changsha 410007，Hunan，China) Abstract：tn this paper，the effects of resistance coefficient of limestone powder and fly ash and the mixed addition of lime— stone powder and fly ash on the concrete sulfate attack were studied，by measuring content of sulfate-ion and XRD．The results in- dicate that the content of sulfate—ion increase as the replacement of ground limestone increasing．Fly ash is better for decreasing the content of sulfate—ion．The addition of fly ash can effectively improve the content of sulfate—ion of the concrete with ground limestone powder．The gypsum was found in the specimens with ground limestone addition after immersed in 5％ Na2SO4 solution for eigth months． Key words：limestone powder：fly ash；mortar；resistance coefficient：content of sulfate—ion：XRD 混凝土的破坏形式多种多样，而硫酸盐侵蚀是混凝土破 的试件具有较好的抗硫酸镁溶液侵蚀性能。 坏的常见形式。近年来，随着石灰石粉、粉煤灰等矿物掺合料 为了更好地研究石灰石粉一粉煤灰对水泥基材料硫酸盐 运用到混凝土中，石灰石粉、粉煤灰对混凝土抗硫酸盐侵蚀研 侵蚀性能，本文分别研究了石灰石粉