粉煤灰高性能混凝土抗碳化性能研究  

Research on Carbonation Resistance of High Performance Concrete with Fly Ash

作　　者：刘继状 朱琳 

机构地区：[1]浙江建设职业技术学院建筑工程系,杭州311231

出　　处：《混凝土与水泥制品》2018年第10期28-30,共3页China Concrete and Cement Products

基　　金：浙江省住房和城乡建设厅项目(2015K76)

摘　　要：通过调节配合比设计制备了多种粉煤灰混凝土,系统研究了粉煤灰掺量、种类、水胶比和养护龄期对混凝土抗碳化性能的影响。结果表明:混凝土碳化深度值和碳化速率均随粉煤灰掺量增加而增加,碳化120 d后W35F60的碳化深度值约为W35F0的7倍;混凝土碳化深度值随水胶比增加而增大,当粉煤灰掺量为40%时,混凝土最佳水胶比为0.30,其120 d碳化深度值仅11.28 mm;混凝土抗碳化性能:Ⅱ级粉煤灰>Ⅰ级粉煤灰;养护龄期越长,混凝土抗碳化性能越强,当养护龄期为90 d时,混凝土碳化深度值是养护龄期28 d的79.47%。The different mix proportion of fly ash concretes were designed and prepared, the effects of content and type of fly ash, W/B and curing age on the carbonation resistance of concrete were systematically studied. The results show that the carbonation depth and carbonation rate of concrete both increase with the increase of fly ash content. The carbonation depth of W35F60 after carbonization for 120 days is about 7 times that of W35F0. The depth of concrete carbonation increases with the increase of W/C. When the content of fly ash is 40%, the optimal W/B of concrete is 0.30, and the carbonized depth value of 120 d is only 11.28 mm. The carbonation resistance of concrete is： Grade HE fly ash〉 Grade l fly ash. The longer curing time, the stronger anti-carbonation performance of concrete, when the curing age is 90 days, the concrete carbonation depth is 79.47% of the curing age of 28 days.

关 键 词：粉煤灰 混凝土 碳化 配合比 

分 类 号：TU528.571[建筑科学—建筑技术科学]