免压蒸预应力离心桩用C80高强混凝土的配制及其力学性能研究  

Preparation and its Mechanical Properties Research on C80 High Strength Concrete for Non-autoclaved Prestressed Centrifugal Pile

作　　者：王朝强[1,2] 朱建舟 谭克锋[1,2] 刘东升[1,2] 张韶华[1,2] 丁文文[1,2] 

机构地区：[1]西南科技大学材料科学与工程学院,绵阳621010 [2]四川省非金属复合与功能材料重点实验室一省部共建国家重点实验室培育基地,绵阳621010 [3]上海中技桩业股份有限公司,200434

出　　处：《混凝土与水泥制品》2014年第8期38-41,共4页China Concrete and Cement Products

基　　金：四川省教育厅项目(10zd1104)

摘　　要：研究了水胶比、砂率及蒸养制度对免压蒸桩用C80高强混凝土力学性能的影响。结果表明,免压蒸桩用C80高强混凝土最佳水胶比和砂率分别为0.24和36%,水泥含量为400kg/m3,矿粉与硅灰互掺近1:1,此时混凝土力学性能和工作性能均满足标准要求;蒸养恒温静停时间也制约着免压蒸预应力桩用C80混凝土的力学性能,通过实验研究得到了一个最佳蒸养制度。The effects of water-binder ratio, sand ratio and steam curing system on the mechanical property of non- autoclaved C80 concrete used in prestressed centrifugal pile are studied. The test results show that the best values of water- binder ratio and sand ratio are 0.24 and 36% respectively, and the cement content is 400kg/m3, the mixing amount ratio of mineral powder and silica fume is close to 1：1. Under these conditions, the mechanical property and working performance of the non-autoclaved C80 concrete can all meet the standard requirements. In addition, thermostatic rest period also restricts the mechanical property of the non-autoclaved C80 concrete, and the optimal steam curing system is obtained by experiment study.

关 键 词：水胶比 砂率 蒸养制度 力学性能 

分 类 号：TU525[建筑科学—建筑技术科学]