Internal curing by superabsorbent polymers in alkali-activated slag

Zhenming Li, Mateusz Wyrzykowski, Hua Dong, José Granja, Miguel Azenha, Pietro Lura, Guang Ye

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)
13 Downloads (Pure)

Abstract

In this study, internal curing by superabsorbent polymers (SAP) is utilized to mitigate self-desiccation and autogenous shrinkage of alkali-activated slag (AAS) pastes. Absorption and desorption kinetics of SAP incorporated in AAS pastes were studied with X-ray tomography. Internal curing delayed the peak of the rate of heat liberation but increased the total reaction degree of AAS pastes. Internal curing by SAP mitigated effectively the drop of internal relative humidity and the self-desiccation-induced autogenous shrinkage of AAS pastes. The cracking tendency of AAS pastes undergoing shrinkage in restrained conditions was also significantly reduced with SAP. Nonetheless, adding SAP, regardless of their content, cannot eliminate the autogenous shrinkage of AAS pastes, suggesting the existence of other autogenous shrinkage mechanism(s) besides self-desiccation.

Original languageEnglish
Article number106123
Number of pages13
JournalCement and Concrete Research
Volume135
DOIs
Publication statusPublished - 2020

Keywords

  • Alkali-activated slag
  • Cracking
  • Mechanical properties
  • Shrinkage
  • Superabsorbent polymers

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