Influence of Curing Time on the Drying Shrinkage of Concretes with Different Binders and Water-to-Binder Ratios
Influence of Curing Time on the Drying Shrinkage of Concretes with Different Binders and Water-to-Binder Ratios
复制标题
养护时间对不同粘结剂和水胶比混凝土干燥收缩的影响
DOI：
10.1155/2017/2695435
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发表时间：
2017-01-01
影响因子：
--
通讯作者：
Zhou, Yuqi
中科院分区：
文献类型：
--
作者：
Yang, Jun;Wang, Qiang;Zhou, Yuqi
设计了素水泥混凝土、矿渣颗粒混凝土和粉煤灰混凝土。采用3个湿养护期，分别为2、5和8天。湿养护后1年内测定混凝土的干缩值。结果表明：无论湿养护时间长短，掺矿物外加剂混凝土后期干缩的增加速率均高于普通水泥混凝土；随着湿养护时间的缩短，混凝土总干收缩率的增量随着W/B比的减小而减小。湿养护时间的缩短对粉煤灰混凝土干缩的负面影响要比GGBS混凝土和素水泥混凝土明显得多。在湿养护时间不足的情况下，超细矿渣粉可降低矿渣粉混凝土和粉煤灰混凝土的干燥收缩率。
Plain cement concrete, ground granulated blast furnace slag (GGBS) concrete, and fly ash concrete were designed. Three wet curing periods were employed, which were 2, 5, and 8 days. The drying shrinkage values of the concretes were measured within 1 year after wet curing. The results show that the increasing rate of the drying shrinkage of concrete containing a mineral admixture at late age is higher than that of plain cement concrete regardless of the wet curing time. With the reduction of wet curing time, the increment of total drying shrinkage of concrete decreases with the decrease of the W/B ratio. The negative effects on the drying shrinkage of fly ash concrete due to the reduction of the wet curing time are much more obvious than those of GGBS concrete and plain cement concrete. Superfine ground granulated blast furnace slag (SGGBS) can reduce the drying shrinkage of GGBS concrete and fly ash concrete when the wet curing time is insufficient.