粉煤灰高性能混凝土一维/二维/三维碳化性能研究  

1D/2D/3D Carbonation Resistance of High Performance Concrete with Fly Ash

作　　者：李小斌 LI Xiao-bin(Qinghai Transportation Investment Co.,Ltd.,Xining 810000,China)

机构地区：[1]青海交通投资有限公司

出　　处：《硅酸盐通报》2019年第12期4047-4054,共8页Bulletin of the Chinese Ceramic Society

摘　　要：通过粉煤灰高性能混凝土碳化依时深度试验,结合SEM、XRD等微观分析手段,研究了粉煤灰掺量、水胶比、养护龄期等因素对粉煤灰高性能混凝土一维、二维和三维碳化深度值的影响。结果表明:混凝土抗碳化能力随粉煤灰用量和水胶比增加而降低;前期养护时间的延长有利于混凝土抵抗碳化反应。由于叠加效应,粉煤灰混凝土三维、二维碳化较一维碳化更为严重,同试验周期下碳化深度值升高1. 39~2. 88倍。Effects of fly ash content,water-binder ratio and curing age on one,two and three-dimensional carbonation depth of fly ash concrete were investigated,respectively,combined with SEM and XRD methods. The results show that higher fly ash content and water-binder ratio led to decrease carbonation resistance. Relatively longer curing age improve carbonation resistance of concrete. Due to overlapping effect,3D and 2D carbonation depict severer cases than 1D scenario,showing 1. 39 to 2. 88 times higher carbonation values.

关 键 词：粉煤灰 高性能混凝土 碳化 三维 

分 类 号：TU528.58[建筑科学—建筑技术科学]