Cracking Potential of Alkali-Activated Concrete Induced by Autogenous Shrinkage

Zhenming Li*, Shizhe Zhang, Xuhui Liang, Albina Kostiuchenko, Guang Ye

*Corresponding author for this work

Research output: Chapter in Book/Conference proceedings/Edited volumeChapterScientific

Abstract

Alkali activated concrete (AAC) has not received broader industry acceptance, one reason of which lies in the uncertainties in the durability against shrinkage and potential cracking. Many studies reported that AAC exhibit larger autogenous shrinkage than OPC concrete. However, it is unable to deduce that AAC should show higher cracking potential than OPC concrete only based on the higher autogenous shrinkage of AAC. The cracking potential of concrete is determined by multiple factors including autogenous shrinkage, creep/relaxation, elastic modulus, and tensile properties of the concrete. However, very few studies have considered these parameters. Furthermore, the influence of precursors (e.g. slag or fly ash) on the cracking potential of AAC induced by autogenous shrinkage is also rarely studied. The aim of this study, therefore, is to investigate the autogenous shrinkage-induced cracking potential of slag and fly ash-based AAC. The free autogenous shrinkage of the specimens is measured by Autogenous Deformation Testing Machine (ADTM). The autogenous shrinkage-induced stress and cracking of the concrete under restraint condition is tracked by Thermal Stress Testing Machine (TSTM). Additionally, the influence of precursors on the autogenous shrinkage induced cracking potential is discussed.

Original languageEnglish
Title of host publicationProceedings of the 3rd RILEM Spring Convention and Conference (RSCC 2020)
EditorsI.B. Valente
Place of PublicationCham
PublisherSpringer
Pages239-245
Number of pages7
ISBN (Electronic)978-3-030-76551-4
ISBN (Print)978-3-030-76550-7
DOIs
Publication statusPublished - 2021

Publication series

NameRILEM Bookseries
Volume33
ISSN (Print)2211-0844
ISSN (Electronic)2211-0852

Bibliographical note

Accepted Author Manuscript

Keywords

  • Alkali-activated materials
  • Concrete
  • Cracking
  • Fly ash
  • Shrinkage
  • Slag

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