硫酸盐环境中喷射混凝土配合比设计  

Mix design of shot concrete in sulfate environment

作　　者：廖乃凤[1] 邓德华[1] 黄波[1] 杜火文[1] 钟磊[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075

出　　处：《混凝土》2010年第5期83-86,共4页Concrete

基　　金：铁道部重大科技专项"铁路隧道混凝土结构盐侵蚀防治技术"(2008G025-C)

摘　　要：介绍了加掺合料喷射混凝土配合比的一般设计方法及步骤,从理论上分析了硫酸盐腐蚀环境中通过加掺合料的方式对喷射混凝土配合比进行优化的可行性,并通过试验研究了双掺粉煤灰和硅灰对喷射混凝土凝结时间和早期强度的影响。结果表明:以10%的粉煤灰+5%的硅灰双掺等量取代水泥,其凝结时间、强度增长等性能均能满足施工及设计承载力要求。A general method and approaches of the mix design of shot concrete with admixture were introduced.The feasibility of the optimiza- tion of shot concrete mix proportion was discussed theoretically.The influence of the admixture of fly ash and silica fume on setting time and strength in the early stage of shot concrete was studied experimentally.Results showed that,shot concrete resistance to sulfate attack can be obvi- ously improved by equal replacement of cement with 10% fly ash and 5% silica fume.The concrete properties such as setting time and strength growth met the demands of construction and bearing capacity designed.

关 键 词：喷射混凝土 硫酸盐侵蚀 配合比设计 等量取代 

分 类 号：TU528.062[建筑科学—建筑技术科学]