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硅酸盐学报 2013

氯盐环境对PVA纤维增强水泥基复合材料抗冻性的影响

张菊,刘曙光,闫长旺,白建文,闫敏

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Abstract:

在氯盐环境和淡水环境中进行聚乙烯醇纤维增强水泥基复合材料(polyvinylalcoholfiberreinforcedengineeredcementitiouscomposite，PVA-ECC)快速冻融试验，研究了氯盐环境对试件外观形貌、质量损失率、相对动弹性模量和耐久性指数的影响。结果表明氯盐环境中，PVA-ECC试件质量在冻融循环初期呈增大趋势，在冻融循环后期因表层严重剥落，导致质量下降，质量损失率显著增大，整个冻融循环过程中试件的耐久性指数较小，相对动弹性模量明显下降；淡水环境中PVA-ECC试件经历冻融循环后基本保持原有形状和尺寸，质量损失率变化幅度较小，相对动弹性模量下降趋势平缓，耐久性指数较大。与淡水环境相比，氯盐环境中PVA-ECC试件的抗冻性显著下降，表明氯盐环境对PVA-ECC抗冻性有重要影响。

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