Characterization of one-part alkali-activated slag with rice straw ash

Kangting Yin, Yaqing Jiang*, Hui He, Jie Ren, Zhenming Li

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)
30 Downloads (Pure)

Abstract

In this paper, fresh (setting and rheology) and hardened properties (strength and shrinkage) of one-part alkali-activated slag (AAS) with and without rice straw ash (RSA) are comprehensively investigated. The reaction kinetics and microstructure of the mixtures are characterized by a series of experimental techniques. The results reveal that RSA plays dual roles in AAS, as a precursor (though not fully reactive) and an internal curing agent. The reactive K and Si in RSA participate in the formation of C-(A)-S-H gel and the alkaline groups dissolved from the ash facilitate the hydrolysis of slag. Besides, the porous RSA absorbs liquid in the first day and releases it afterwards, thus providing internal curing to the matrix. The consistency index of the paste becomes higher with the incorporation of RSA. Both autogenous and drying shrinkage of AAS, which are considered as two problematic issues for this material, are mitigated by RSA.

Original languageEnglish
Article number128403
Number of pages12
JournalConstruction and Building Materials
Volume345
DOIs
Publication statusPublished - 2022

Keywords

  • Alkali-activated slag
  • Microstructure
  • One-part material
  • Rice straw ash
  • Shrinkage

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