高强度抗老化土工布的制备与性能表征

为提高土工合成材料在实际工程应用中的耐久性和安全性，制备了一种抗老化聚丙烯/高模高强聚乙烯醇短纤维混合土工布，讨论了聚乙烯醇纤维含量对土工布力学和反滤性能的影响，采用扫描电子显微镜观察其内部微观结构，通过相关测试表征了其耐候性以及耐金属离子性能。结果表明：聚乙烯醇纤维均匀分散在土工布内部，使得纤维间缠结更加紧密；高模高强聚乙烯醇纤维含量为60% 时，土工布的力学和反滤性能均得到显著提高，干、湿态断裂强度分别为29.7、34.8 kN/m；等效孔径为0.109 3 mm；同时，耐候性及耐金属离子性能均得到提高，经过90 d光氧老化和18 d热氧老化（硝酸铜溶液浸泡后）实验后，强度保持率分别为73.7%和64.3%。

Preparation and propertiesof high strength and anti-aginggeotextile

In order to improve durability and safety of geotextile inreal engineer application,anti-aging polypropylene/highstrength and high modulus polyvinl alcohol short fiber mixturegeotextile was prepared. The influence of high strength and high modulus polyvinl alcohol(PVA) short-fibercontent on properties of geotextile was discussed. The inner microcosmic construction was investigated using scanning electron microscopy. The properties of weatherability, filtration characteristicsand metalic ions resistance were investigatedby relevant tests. The results shown that PVA fibers disperse in geotextile uniformly and cause fibers entanglement together; the properties of mechanical and filtration characteristics areenhancedwhen the content of PVA fibers is equal to 60%, dry and wet breaking strenght are 29.7 and 34.8 kN/m, respectively, and the value of theopening size is 0.109 3 mm. Atthe same time, weatherability and metallic ions resistance of geotextile are enganced, the strength retention is 73.7% and 64.3% for photo-oxidation (90d) and thermal oxidation (18d) after immersing in copper nitrate solution.