Double torsion tests for studying slow crack growth of portland cement mortar

M. Wecharatana, S. P. Shah

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


For studying slow crack growth in portland cement mortar 32″ (812.8 mm) long double torsion specimens were tested. During testing, the loading and reloading compliances, permanent (or inelastic) deformations and crack growth were measured. It was observed that the strain energy release rates calculated from elastic, secant or reloading compliances do not accurately represent the fracture behavior of this material. A modified definition of the strain energy release rate is developed here to include both the elastic and the inelastic strain energy absorbed during crack extension. For this method, in addition to the reloading compliance, the knowledge of the rate of change of permanent deformations with crack growth is necessary. Details of the analytical and experimental procedure are described in this paper.

Original languageEnglish (US)
Pages (from-to)833-844
Number of pages12
JournalCement and Concrete Research
Issue number6
StatePublished - 1980
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • General Materials Science


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