复掺技术对混凝土抗硫酸盐干湿循环性能的影响

Impact of Multi-Addition Technology on the Performance of Concrete Resistance to Sulfate Dry-Wet Cycles

通过试验研究了多元矿物掺合料、引气剂及聚丙烯纤维复掺混凝土在静止溶液和流动循环溶液两种浸蚀条件下的抗硫酸盐干湿循环性能。结果表明:多元矿物掺合料、引气剂、聚丙烯纤维复掺有利于改善混凝土的抗硫酸盐干湿循环性能;混凝土聚丙烯纤维体积掺量小于0.2%、含气量小于6%时,随纤维和引气剂掺量增大,混凝土的抗硫酸盐干湿循环性能增强;降低混凝土的渗透性是改善其抗硫酸盐干湿循环性能的良好途径。

Concrete's resistance to sulfate dry-wet cycle's performance under stationary solution and flow loop solution is studied by experiments.The two corrosion ways are mixed with multiple mineral admixtures,air entraining agent and polypropylene fiber.The results show that the multiple mineral admixtures,air entraining agent,re-mixed with polypropylene fibers will help to improve the performance of concrete resistance to sulfate dry-wet cycles;when the concrete polypropylene fiber volume content is wthin 0.2% and air content wthin 6%,the performance of concrete resistance to sulfate dry-wet cycles becomes much stronger,with the increase of polypropylene fiber and air entraining agent content;reducing the permeability of the concrete is a good way to improve its performance of resistance to sulfate dry-wet cycles.