Using fracture to predict restrained shrinkage cracking: The importance of specimen geometry

W. J. Weiss, W. Yang, S. P. Shah

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Early-age cracking can occur in concrete if free shrinkage is prevented by the surrounding structure. This paper highlights recent findings to illustrate that shrinkage cracking is influenced by the geometry of the structure. A series of experimental results are presented from three different ring specimen geometries to illustrate that although these specimens had the same residual strain level (and similar residual stress), the age of cracking varied with specimen geometry. A second series of experiments was performed to illustrate that a geometry dependence also exists in specimens with moisture gradients. This paper describes how fracture mechanics concepts can explain this geometry dependent behavior under a uniform moisture distribution. Residual stress levels are computed, non-linear fracture mechanics failure criterion is applied to develop the time and geometry dependent tensile stress resistance curves, and the age of cracking is predicted. The theoretical simulations were found to compare reasonably with the experimental observations. A discussion is provided to illustrate how these considerations may be extended to the specimens with moisture gradients.

Original languageEnglish (US)
Title of host publicationFracture Mechanics for Concrete Materials
Subtitle of host publicationTesting and Applications
EditorsC. Vipulanandan, W.H. Gerstle
PublisherAmerican Concrete Institute
Pages17-34
Number of pages18
ISBN (Electronic)9780870310393
StatePublished - Jul 1 2001
Externally publishedYes
EventFracture Mechanics for Concrete Materials: Testing and Applications at the ACI 2000 Spring Annual Convention - San Diego, United States
Duration: Mar 27 2000 → …

Publication series

NameAmerican Concrete Institute, ACI Special Publication
VolumeSP-201
ISSN (Print)0193-2527

Conference

ConferenceFracture Mechanics for Concrete Materials: Testing and Applications at the ACI 2000 Spring Annual Convention
Country/TerritoryUnited States
CitySan Diego
Period3/27/00 → …

Keywords

  • Cracking
  • Early-age
  • Geometry
  • R-curve
  • Restrained shrinkage
  • Shrinkage
  • Testing

ASJC Scopus subject areas

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

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