聚乙烯醇纤维增强水泥基复合材料在长期浸泡作用下抗硫酸盐侵蚀性能

Resistance of polyvinyl alcohol fiber reinforced cementitious composites to sulfate attack under long-term immersion

为了研究纤维和粉煤灰对长期浸泡作用下聚乙烯醇纤维增强水泥基复合材料(PVA纤维/水泥复合材料)抗硫酸钠侵蚀的影响,对多次试验周期后的试件表观形貌变化、质量变化、体积变化、抗压强度和微观结构进行分析研究。试验结果表明,纤维的掺入及良好的分散,在水泥基体中形成了良好的网络分布结构,使PVA纤维/水泥复合材料在硫酸钠溶液中的侵蚀速度减缓,但纤维掺量有一个最佳值;粉煤灰的掺入在一定程度上密实了PVA纤维/水泥复合材料,使其抗硫酸钠侵蚀性能得到改善,质量分数在50%之内时随着掺量的增加而更加明显。

In order to research the effect of fiber and fly ash on resistance of polyvinyl alcohol fiber reinforced cementitious composites（PVA fiber/cement composites）to sulfate attack under long-term immersion, the research was done by analyzing morphology change, quality change, volume change, compressive strength and microstructure of the samples tested after several experimental periods. The results of the experiments show that the fiber incorporation with good distribution forming excellent network distribution structure in matrix slows down the erosion rate of PVA fiber/cement composites in sodium sulfate solution, but there is the best content for the fiber incorporation. The fly ash corporation solids PVA fiber/cement composites, and obviously improves resistance of PVA fiber/cement composites to sulfate attack with increasing doping content under mass fraction of 50%.