Influence of shrinkage-reducing admixtures on development of plastic shrinkage cracks

Pietro Lura, Brad Pease, Guy B. Mazzotta, Farshad Rajabipour, Jason Weiss

Research output: Contribution to journalArticlepeer-review

135 Scopus citations

Abstract

The term plastic shrinkage cracking is generally used to describe cracks that form between the time when concrete is placed and the time when concrete sets. This paper discusses how the evaporation of water causes concave menisci to form on the surface of fresh concrete. These menisci cause both settlement of the concrete and tensile stress development in the surface of the concrete, which increase the potential for development of plastic shrinkage cracks. Specifically, this paper studies the development of plastic shrinkage cracks in mortars containing a commercially available shrinkage-reducing admixture (SRA). Mortars containing SRA show fewer and narrower plastic shrinkage cracks than plain mortars when exposed to the same environmental conditions. It is proposed that the lower surface tension of the pore fluid in the mortars containing SRA results in less evaporation, reduced settlement, reduced capillary tension, and lower crack-inducing stresses at the topmost layer of the mortar.

Original languageEnglish (US)
Pages (from-to)187-194
Number of pages8
JournalACI Materials Journal
Volume104
Issue number2
StatePublished - Mar 2007

All Science Journal Classification (ASJC) codes

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

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