Thermal induced stress and associated cracking in cement-based composite at elevated temperatures - Part II: Thermal cracking around multiple inclusions

Y. F. Fu, Y. L. Wong, C. A. Tang, Chi Sun Poon

Research output: Journal article publicationJournal articleAcademic researchpeer-review

55 Citations (Scopus)

Abstract

A 2-D mesoscopic thermoelastic damage model is developed and used to study the thermal stress field and associated fracture in a cement-based composite with multiple circular or irregular inclusions subjected to elevated temperatures. It is found that the thermal stress field and the associated cracking are dominated by (i) the thermal mismatch between the matrix and the inclusions, (ii) the arrangement of the inclusions, and (iii) the heterogeneity and the shape of the inclusions. Thermal radical cracks firstly occur between two adjacent inclusions, which have the shortest distance apart or sharp corners when the coefficient of thermal expansion of the inclusions is greater than that of the matrix. The propagation of radical cracks in the matrix will be terminated by the presence of an inclusion with higher strength at the crack tip. The numerical findings are also used to discuss the thermal cracking histories of concretes with different aggregate grading arrangements.
Original languageEnglish
Pages (from-to)113-126
Number of pages14
JournalCement and Concrete Composites
Volume26
Issue number2
DOIs
Publication statusPublished - 1 Feb 2004

Keywords

  • Heterogeneity
  • Irregular inclusion
  • Numerical simulation
  • Thermal induced cracking
  • Thermal stress

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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