曹 霞1,李文龙1,陈宜虎2
掺入两种纤维的RPC氯离子扩散性能试验研究
曹 霞1,李文龙1,陈宜虎2
摘 要:通过快速氯离子扩散系数的测定方法(NEL法),对16组不同钢纤维和聚丙烯纤维掺量的活性粉末混凝土(RPC)试件进行试验,每组试块采用三种不同养护方案。试验结果表明,经过湿热养护后的RPC试块的抗氯离子扩散性能得到较大提高;掺入钢纤维不利于RPC的抗氯离子扩散性能,RPC中钢纤维的最佳体积掺量比例为2%;掺入聚丙烯纤维对RPC的抗氯离子扩散性能有很大提高,则RPC中聚丙烯纤维的最佳体积掺量比例为0.2%:混合掺入两种纤维的RPC,可结合两种纤维的特性,抗氯离子扩散性能得到有效的提高。
Abstract: Based on a rapid measuring method of the chloride ion diffusion coefficient (the NEL test method), 16 groups of reactive powder concrete (RPC) specimens with steel fiber and polypropylene fiber are tested. Each group of RPC specimens is taken three kinds of curing measures. The results show that anti-chloride ion diffusion property of RPC specimens under the condition of heat curing is improved. Steel fiber can decrease anti-chloride ion diffusion property of RPC, and its optimum volume content is 2%. Polypropylene fiber can improve greatly anti- chloride ion diffusion property of RPC, and its optimum volume content is 0.2%. Anti-chloride ion diffusion property of RPC with the two kinds of fibers is improved effectively, due to the advantages of steel fiber and polypropylene fiber.
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