饱和钢纤维再生混凝土氯离子扩散特性研究

利用废弃骨料制作再生混凝土是建筑固废弃物的再生资源利用途径之一,其在氯盐侵蚀环境条件下的耐久性规律与普通混凝土不同。本文以模拟海洋侵蚀环境,通过改变水灰比及NaCl溶液浓度,分析各因素对钢纤维再生混凝土氯离子扩散行为的影响规律。结果表明:浸泡液浓度越大,进入混凝土内部的氯离子越多,随着深度的增加氯离子含量逐渐减少;较低的水灰比与适量钢纤维的掺入均可以有效降低氯离子扩散系数,提升钢纤维再生混凝土的抗氯盐侵蚀能力;氯离子扩散系数随着NaCl溶液浓度的增加而增大。

Study on chloride diffusion characteristics of saturated steel fiber recycledconcrete

The use of waste aggregate to produce recycled concrete is one of the ways to utilize the renewable resources of building solid waste.Its durability law under the environment of chloride salt erosion is different from ordinary concrete.By simulating the marine erosion environment and changing the water-cement ratio and NaCl solution concentration,the influence of various factors on the chloride ion diffusion behavior of steel fiber recycled concrete was analyzed.The results show that as the concentration of soaking solution became greater,more chloride ions would enter the concrete,and the chloride ion content gradually decreased with increasing depth.The proper amount of steel fiber blending and lower water-cement ratio could enhance the resistance of the recycled concrete to chloride corrosion.The chloride ion diffusion coefficient increased with the increase of the external chloride salt concentration.