偏高岭土和PVA纤维对喷射混凝土强度的影响

Effects of Metakaolin and PVA Fiber on the Compressive Strength of Shotcrete

通过开展不同温度、湿度条件下掺加不同掺量偏高岭土(MK)及不同长度聚乙烯醇(PVA)纤维的喷射混凝土喷射试验,探究不同养护环境下不同掺量的MK和不同长度PVA纤维对喷射混凝土抗压强度的影响规律。结果表明:在常温常湿的养护条件下,随MK掺量和PVA纤维长度的增加,喷射混凝土的抗压强度均呈现出先增大后减小的变化趋势,但在高温高湿的养护条件下,随MK掺量的增加,喷射混凝土的抗压强度呈现出增大的趋势;在高温高湿的养护条件下,喷射混凝土的抗压强度低于常温常湿养护下的。

Shotcrete spraying experiments were carried out under different temperature and humidity conditions with different dosage of metakaolin(MK)and different length of polyvinyl alcohol(PVA)fiber.The influence of different content of MK and different length of PVA fiber on the compressive strength of shotcrete under different curing conditions was explored.The results show that the compressive strength of shotcrete increases first and then decreases with the increase of MK content and PVA fiber length under the curing condition of normal temperature and constant humidity.However,under the curing condition of high temperature and high humidity,the compressive strength of shotcrete tends to increase with the increase of MK content.Under the condition of high temperature and high humidity curing,the compressive strength of shotcrete is lower than that of shotcrete under normal temperature and constant humidity curing.