混凝土早龄期减缩措施与性能研究  

Measures to Reduce the Shrinkage of Early-age Concrete and Their Performance Study

作　　者：刘红霞[1] 田正宏[2] 韩仕宾 江敏[4] 

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098 [3]南水北调东线江苏水源有限责任公司,江苏南京210000 [4]江苏省骆运水利工程管理处,江苏宿迁223800

出　　处：《施工技术》2013年第4期31-34,共4页Construction Technology

基　　金：国家自然科学基金面上项目(51279054);江苏省水利科技重点项目:混凝土表层致密化技术研究与推广应用(2009021);南水北调工程科技创新(NSBD-SNEZ(F)/KY-01-20-2012)

摘　　要：采用透水模板施工工艺作为一种混凝土有效减缩措施,分析了其在混凝土成型早龄期的减缩效果与作用机理;同时试验探讨了混凝土早龄期减缩的后期耐久性能。结果表明,透水模板可以有效抑制混凝土早龄期收缩;不同透水模板的保水能力对混凝土早龄期减缩效果存在显著差别;采用透水模板浇筑的混凝土后期抗渗性和抗碳化性能有所提高。This paper presents the use of Controlled Permeability Formwork （CPF） to reduce early-age shrinkage of concrete. Its effect to reduce the shrinkage and the durability performance of the concrete in the late phase were tested. The results show that CPF can effectively restrain the early-age shrinkage of concrete. It is also observed from the tests that CPFs with different water retentions have remarkably different shrinkage reduction effects. With CPF, the impermeability and carbonation resistance of the concrete are enhanced.

关 键 词：混凝土 早龄期 透水模板 收缩 耐久性 

分 类 号：TU755[建筑科学—建筑技术科学]