水泥浆体早期的自收缩和干燥收缩  

Autogenous shrinkage and drying shrinkage of cement paste at early aging

作　　者：朱建强[1] 邓敏[1] 马惠珠[1] 张志宾[1] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2007年第3期30-33,共4页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家重点基础研究发展计划(973计划)资助项目(2001CB610705)

摘　　要：水泥浆体早期(<7 d)收缩行为已受到越来越多的关注,利用波纹管法测量自收缩,通过测量不同水灰比净浆的自收缩和干燥收缩来评价早期收缩.试验结果表明,与其他方法相比,波纹管法能直接准确地测量早期自收缩.养护1 d后测量初长为基准测量自收缩会忽略水泥浆体早期很大一部分自收缩,初凝后10 min开始测量较为合理.由于很多工程中实际养护条件不足,以养护3 d初长为基准测得的干燥收缩不能准确反映真实的早期干燥收缩.The shrinkage of cement paste at early aging （ 〈 7d） has been paid much attentions. Autogenous shrinkage was examined by corrugated pipe method. Autogenous shrinkage and drying shrinkage of cement paste with different W/C ratio were measured to evaluate the shrinkage at early aging. Experimental results demonstrated that corrugated pipe method could truly and directly used to examine the autogenous shrinkage at early aging compared to other methods. Since much shrinkage is neglected when autogenous shrinkage is measured after cured for 1 day, it is more reasonable to measure initial length at 10 rain after initial set. Drying shrinkage based on initial length measured after cured for 3 days was not reliable because of the short aging of curing condition in many practical projects.

关 键 词：水泥浆体 自收缩 干燥收缩 

分 类 号：TU502[建筑科学—建筑技术科学]