Comparison on the properties of ITZs in fly ash-based geopolymer and Portland cement concretes with equivalent flowability

Zhiyu Luo, Wengui Li*, Kejin Wang, Arnaud Castel, Surendra P. Shah

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

This paper aims to compare the properties of interfacial transition zones (ITZs) in Portland cement (PC) concrete and geopolymer concrete. Portland cement and geopolymer pastes were designed with the equivalent flowability to provide similar mix and casting condition of ITZs. Two types of modelled ITZs were prepared to facilitate the nanoindentations across ITZs, microstructural characterization, and comparison on the properties of ITZs with less influential factors. The results showed that the interfacial bonding of ITZs between geopolymer matrix and aggregate is relatively stronger than the counterpart in the PC concrete. There is a high amount of crystalline hydration products in the ITZs of PC concrete, but a layer gel-rich paste with denser microstructures in the ITZs of geopolymer concrete. Additionally, the interface morphology and nanoindentation analysis indicate that the property of ITZs in the modelled geopolymer concrete is not poorer than that of the corresponding geopolymer paste.

Original languageEnglish (US)
Article number106392
JournalCement and Concrete Research
Volume143
DOIs
StatePublished - May 2021
Externally publishedYes

Keywords

  • Geopolymer concrete
  • Interfacial transition zone (ITZ)
  • Micromechanical properties
  • Microstructure
  • Nanoindentation

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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