Understanding the drying shrinkage performance of alkali-activated slag mortars

Hailong Ye, Christopher Cartwright, Farshad Rajabipour, Aleksandra Radlińska

Research output: Contribution to journalArticle

59 Scopus citations

Abstract

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 AAS shrinks more when the RH is decreased gradually, instead of directly. At high RH, the drying shrinkage of AAS 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.

Original languageEnglish (US)
Pages (from-to)13-24
Number of pages12
JournalCement and Concrete Composites
Volume76
DOIs
StatePublished - Feb 1 2017

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Materials Science(all)

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