Abstract

This paper presents fracture responses of alkali-activated slag (AAS) mortars with up to 30% (by volume) of slag being replaced by waste iron powder that contains a significant fraction of elongated iron particles. The elongated particles act as microreinforcement and improve the crack resistance of AAS mortars by enlarging the fracture process zone (FPZ). An enlarged FPZ signifies increased energy dissipation, which is reflected in a significant increase in crack growth resistance as determined from R-curves. Fracture responses of notched AAS mortar beams under three-point bending are simulated using the extended finite-element method (XFEM) to develop a tool for direct determination of fracture characteristics such as crack extension and fracture toughness in particulate-reinforced AAS mortars. Fracture response simulated using the XFEM framework correlates well with experimental observations. The comprehensive fracture studies reported here provide an economical and sustainable means of improving the ductility of AAS systems, which are generally more brittle than their conventional portland cement counterparts.

Original languageEnglish (US)
Article number04019043
JournalJournal of Materials in Civil Engineering
Volume31
Issue number5
DOIs
StatePublished - May 1 2019

Keywords

  • Alkali-activated slag
  • Digital image correlation
  • Extended finite-element method
  • Fracture response
  • Particulate reinforcement

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)
  • Mechanics of Materials

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