Volume change and cracking in internally cured mixtures made with saturated lightweight aggregate under sealed and unsealed conditions
Volume change and cracking in internally cured mixtures made with saturated lightweight aggregate under sealed and unsealed conditions
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DOI：
10.1016/j.cemconcomp.2009.04.003
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发表时间：
2009-08-01
影响因子：
10.5
通讯作者：
Weiss, Jason
中科院分区：
文献类型：
--
作者：
Henkensiefken, Ryan;Bentz, Dale;Weiss, Jason
低水灰比（W/C）混凝土表现出早期收缩开裂的发生率增加。这些事件催生了混凝土混合物设计的创新发展，降低了开裂的风险。一种这样的发展是内部固化，其利用饱和轻骨料（SLWA）的包含物。SLWA在水泥浆水化时为水泥浆提供额外的水分，从而抵消自干燥的影响。本文介绍了一项研究，研究砂浆系统与不同体积的SLWA密封和非密封条件下的结果。具体而言，结果表明SLWA的体积和类型的内部湿度，自收缩和约束收缩开裂行为的影响。每个系统的性能被示出为与在膏中的蒸汽填充的空间的空化，SLWA间距，和相对于LWA的膏的孔结构。(C)2009爱思唯尔有限公司保留所有权利。
Low water to cement ratio (w/c) concrete exhibits increased occurrences of early-age shrinkage cracking. These occurrences have spawned innovative developments in concrete mixture design that reduce the risk of cracking. One such development is internal curing, which utilizes the inclusion of saturated lightweight aggregate (SLWA). The SLWA supplies additional moisture to cement paste as it hydrates thereby counteracting the effects of self-desiccation. This paper presents results from a study that examined mortar systems with different volumes of SLWA under sealed and unsealed conditions. Specifically, the results indicate the influence of SLWA volume and type on the internal humidity, autogenous shrinkage, and restrained shrinkage cracking behavior. The performance of each system is shown to be related to the cavitation of vapor-filled space in the paste, the SLWA spacing, and the pore structure of the paste in relation to the LWA. (C) 2009 Elsevier Ltd. All rights reserved.