受力状态下混凝土试件氯离子侵蚀试验

氯离子侵入而导致的钢筋锈蚀现象是混凝土结构的常见病害之一,因此混凝土抵抗氯离子侵入的能力对其耐久性有重要影响。进行氯离子侵蚀试验是研究氯离子侵入规律的有效手段,但目前的研究成果大部分是针对无应力状态下的普通混凝土,对处于受力状态下的混凝土研究很少。为了研究受力状态下混凝土的抗氯离子侵入性能,对混凝土进行了盐溶液浸泡和盐雾试验,得出未开裂的试件在不同水灰比、受力状态、应力水平和作用环境下的试验结果,并对其进行对比分析。试验结果表明:减小水灰比能提高混凝土的抗氯离子侵蚀能力;在拉应力状态下的氯离子含量比无应力状态下的要多;在压应力状态下的氯离子含量取决于压应力水平;盐溶液浸泡环境对混凝土结构的作用比盐雾严重得多。

Chloride ion erosion test of concrete specimens under stress

Corrosion of steel bar caused by chloride invasion is one of the common diseases of concrete structure, so the ability of concrete to resist chloride invasion has an important influence on its durability. Chloride ion erosion test is an effective means to study the law of chloride ion invasion, but most of the current research results are aimed at ordinary concrete without stress, and there are few studies on concrete under stress. In order to study the chloride invasion resistance of concrete under stress, the concrete was soaked in salt solution and salt spray test. The test results of uncracked specimens under different water-cement ratio, stress state, stress level and working environment were obtained, and the results were compared and analyzed. The test results show that reducing the water-cement ratio can improve the chloride ion erosion resistance of concrete. The content of chloride ion in tensile stress state is higher than that in non-stress state. The content of chloride ion under compressive stress depends on the level of compressive stress. The effect of salt soaking environment on concrete structure is much more serious than that of salt spray.