Interfacial transition zone and its influence on the fracture behavior of concrete

Davide Zampini*, Hamlin M. Jennings, Surendra P Shah

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations


Concrete specimens of constant water-to-cement ratio and varying amounts of gravel aggregate were tested under 3-point bend. The fracture toughness of the composite and surface roughness of the paste are determined. Fracture parameters obtained from the Two Parameter Fracture Model (TPFM) such as the critical stress intensity factor (KIC) and critical effective crack extension (Δac) are found to be related to the average surface roughness of the paste. The Interfacial Transition Zone (ITZ) and the bulk paste are distinguished by different values of roughness. The surface roughness of the area adjacent to the aggregate particle is evaluated as a function of the distance from the aggregate surface. In particular, the surface roughness of the paste near the aggregate is greater than that of the paste far from the aggregate, and it decreases with distance from the aggregate. The higher roughness of the paste near the aggregate indicates that aggregate particles, and more specifically the ITZ associated with them, act to toughen the paste in concrete.

Original languageEnglish (US)
Pages (from-to)357-366
Number of pages10
JournalMaterials Research Society Symposium - Proceedings
StatePublished - Jan 1 1995
EventProceedings of the 1994 MRS Fall Meeting - Boston, MA, USA
Duration: Nov 28 1994Nov 30 1994

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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