玄武岩纤维混凝土力学性能及氯盐侵蚀行为

Mechanical properties and chloride corrosion behavior of basalt fiber concrete

为探究氯盐侵蚀对玄武岩纤维混凝土力学性能的影响及氯盐在混凝土中的侵蚀行为,以抗压强度、劈裂抗拉强度、氯离子沉积量为表征手段进行盐雾侵蚀试验,并根据Fick第二定律计算得到不同侵蚀龄期下氯离子扩散系数。结果表明:混凝土强度在氯盐侵蚀过程中呈现先上升后下降的趋势;通过氯盐侵蚀的玄武岩纤维与普通混凝土相比,能有效提高混凝土的抗压及劈裂抗拉强度,降低混凝土劣化速率;在相同深度及侵蚀龄期下玄武岩纤维混凝土氯离子含量均低于普通混凝土;此外,氯离子扩散系数随着侵蚀龄期的增加而降低,且相同龄期下玄武岩纤维混凝土氯离子扩散系数均低于普通混凝土。

In order to investigate the effect of chloride erosion on mechanical properties of basalt fiber concrete and chloride erosion behavior in concrete.Salt spray erosion test was carried out with compressive strength,splitting tensile strength and chloride ion deposition as the characterization means,and the chloride ion diffusion coefficient under different erosion ages was calculated according to Fick′s second law.The results show that the strength of concrete increases first and then decreases in the process of chloride erosion.Compared with ordinary concrete,basalt fiber corroded by chloride salt can effectively improve the compressive and splitting tensile strength of concrete and reduce the deterioration rate of concrete.The chloride ion content of basalt fiber concrete is lower than that of ordinary concrete at the same depth and erosion age.In addition,the chloride diffusion coefficient decreases with the increase of erosion age.The chloride diffusion coefficient of basalt fiber concrete is lower than that of ordinary concrete at the same age.