中文摘要：

为了研究寒冷地区带缝工作的聚乙烯醇纤维增强水泥基复合材料（PVA—ECC）的抗（盐）冻性能，采用快冻法研究带有2种不同预制裂缝高度的PVA—ECC分别在淡水和氯盐中的抗冻性能；分析对比不同预制裂缝高度、粉煤灰掺量和冻融循环次数对PVA—ECC抗冻性能的影响；并对各个因素的影响机理进行了分析。研究结果表明：PVA—ECC在氯盐环境中的抗冻性能较差，表层剥落严重；粉煤灰掺量对PVA—ECC抗冻性能影响较大，粉煤灰掺量越高，PVA—ECC抗冻性越差；水冻时，125次冻融循环之前缝高对质量损失影响较大，缝高越大，质量损失率越大，125次冻融循环后，缝高对质量损失的影响不明显；无论是盐冻还是水冻，整个冻融循环过程中，缝高越大，动弹性模量降低得越多，抗冻性越差。

英文摘要：

In order to study the （salt） frozen resistance with initial crack of polyvinyl aicohol-engmeerea cementitious composites （PVA-ECC）, the antifreeze performance of PVA-ECC with two kinds of different initial crack were studied by rapid freeze-thawing experiment in fresh water environment and chlorine salt environment respectively. The influence of different crack height, fly ash content and freeze- thaw cycle times on the frozen resistance of PVA-ECC were analyzed and compared, and the influence mechanism of the factors were analyzed. The results show that the antifreeze performance of PVA-ECC is poorer in chlorine salt environment and surface spalling is serious. Fly ash content has a great influence on the antifreeze performance of PVA-ECC. The higher the fly ash content is, the worse the antifreeze performance of PVA-ECC is. Before 125 times freeze-thaw cycle, effect of crack height on the mass loss is great in fresh water environment. The longer the crack, the mass loss rate is greater. After 125 times freeze-thaw cycle, effect of crack height on the mass loss is not obvious. During the entire freeze-thaw cycle process, whether in fresh water environment or in chlorine salt environment, the longer the crack, the dynamic elastic modulus reduces more and the frost resistance is poorer. 2 tabs, 11 figs, 20 refs.