期刊
CEMENT & CONCRETE COMPOSITES
卷 76, 期 -, 页码 13-24出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2016.11.010
关键词
Alkali-activated slag; Relative humidity; Drying shrinkage; Shrinkage mechanism; Creep modulus
资金
- U.S. National Science Foundation (NSF) [1265789]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1265789] Funding Source: National Science Foundation
In this work, drying shrinkage of four alkali-activated slag (AAS) mortars, prepared using various types/dosages of activator, was characterized at four different levels of relative humidity (RH) and two drying regimes (i.e. direct and step-wise drying). The results show that drying shrinkage values of AAS are significantly dependent on the drying rate, as MS shrinks more when the RH is decreased gradually, instead of directly. At high RH, the drying shrinkage of MS exhibits a considerable visco-elastic/visco-plastic behavior, in comparison to ordinary portland cement (OPC). It is concluded that the cause of high-magnitude shrinkage in AAS mortar is due to the high visco-elastic/visco-plastic compliance (low creep modulus) of its solid skeleton. Furthermore, the activator affects the shrinkage behaviors of AAS by influencing the pore structure and mechanical properties. (C) 2016 Elsevier Ltd. All rights reserved.
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