Characterization of the paste-aggregate interfacial transition zone surface roughness and its relationship to the fracture toughness of concrete

D. Zampini*, H. M. Jennings, S. P. Shah

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Notched concrete beams containing varying amounts of pea gravel aggregate were tested under three-point bend, and their fracture toughness determined. The roughness of the region near the interface between the cement paste and the aggregate was evaluated by digitizing images from a confocal tandem scanning microscope. The average roughness of the paste was found to be related to the fracture parameters KIC (critical stress intensity factor) and Δac (critical crack extension), as determined by the two-parameter fracture model. The roughness in the proximity of the paste-aggregate interface was generally higher than that of the paste far from the aggregate, and it decreased with the distance from the aggregate. This study indicates that aggregate particles increase the toughness of the cement paste portion of concrete, and that this is an important mechanism for toughening concrete.

Original languageEnglish (US)
Pages (from-to)3149-3154
Number of pages6
JournalJournal of Materials Science
Volume30
Issue number12
DOIs
StatePublished - Jun 1 1995

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint

Dive into the research topics of 'Characterization of the paste-aggregate interfacial transition zone surface roughness and its relationship to the fracture toughness of concrete'. Together they form a unique fingerprint.

Cite this