海水侵蚀对纤维混凝土力学性能和氯离子传输性能的影响

Influence of seawater erosion on the mechanical properties and chloride ion transport of fiber concrete

为研究海水侵蚀对纤维混凝土力学和氯离子传输性能的影响,以玄武岩纤维和玻璃纤维制备混凝土试样,之后将试样放入海水和纯净水中浸泡2、4、8、16个月后测试其抗压强度和氯离子侵蚀深度和浓度。结果表明试样的抗压强度均随着纤维的掺入而上升,在掺量为0.5%~1%时,玄武岩纤维混凝土的强度最大且在相同掺量下,掺入玄武岩纤维的试样的强度大于掺入玻璃纤维的试样的抗压强度。海水浸泡后,试样的强度均出现了不同程度的下降且海水浸泡时间越长,试样的抗压强度损失率越高;海水浸泡时间越长,试样的氯离子侵蚀程度越明显;在海水浸泡时间≤4个月时,玻璃纤维混凝土的氯离子侵蚀程度小于玄武岩纤维混凝土的氯离子侵蚀程度;其中玄武岩纤维和玻璃纤维的最佳掺量分别为2%和0.5%。

In order to study the influence of seawater erosion on the mechanics and chloride ion transport of fiber concrete,concrete samples were prepared with basalt fiber and glass fiber,and then the samples were immersed in seawater and purified water for 2,4,8 and 16 months before testing.Compressive strength and depth and concentration of chloride ion attack.The results show that the compressive strength of the sample increases with the addition of fibers.When the content is 0.5%to 1%,the strength of the basalt fiber concrete is the highest.At the same content,the strength of the sample with basalt fiber It is greater than the compressive strength of the sample mixed with glass fiber.After the seawater immersion,the strength of the samples decreased to different degrees.The longer the seawater immersion time,the higher the compressive strength loss rate of the sample.The longer the seawater immersion time,the more obvious the chloride ion erosion of the sample.When the seawater immersion time is less than 4 months,the chloride ion erosion degree of glass fiber concrete is less than that of basalt fiber concrete.The best content of basalt fiber and glass fiber are 2%and 0.5%,respectively.