Uniaxial compressive behaviors of fly ash/slag-based geopolymeric concrete with recycled aggregates

Zhuo Tang, Yong Hu, Vivian W. Y. Tam, Wengui Li

Research output: Contribution to journalArticlepeer-review

108 Citations (Scopus)

Abstract

The uniaxial compressive stress-strain behaviors of fly ash/ground granulated blast furnace slag (GGBFS) geopolymeric concrete containing recycled aggregate were investigated in this study. Geopolymeric concretes with the variations of three recycled aggregate replacement ratios (i.e., 0%, 50% and 100%) and four contents of slag (i.e., 0%, 10%, 20% and 30% of the mass of total binder) were tested under uniaxial compression. Special attention was devoted to the failure behaviors and patterns, stress-strain characteristics (such as the peak stress, the elastic modulus, the peak strain, and the ultimate strain) and energy absorption capacity. The results showed that the peak stress, elastic modulus and energy absorption (toughness) decreased with the increase of the replacement ratio of recycled aggregate, while these mechanical properties increased when the content of slag increased. The reverse trend was observed with respect to the ductility. Moreover, the inclusion of slag could alleviate the nagative effects of the recycled aggregate replacement on the stress-strain characteristics of geopolymeric concrete. Additionally, a stress-strain model was developed in this study by modifying the parameters of the existing stress-strain model with the best prediction. This new proposed model can satisfactorily describe the stress-strain behaviors for both geopolymeric natural aggregate concrete and geopolymeric recycled aggregate concrete.
Original languageEnglish
Article number103375
Number of pages16
JournalCement and Concrete Composites
Volume104
DOIs
Publication statusPublished - 2019

Keywords

  • aggregates (building materials)
  • concrete
  • fly ash

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