Effect of coarse aggregate size on non-uniform stress/strain and drying-induced microcracking in concrete

Peng Gao, Yang Chen, Haoliang Huang, Zhiwei Qian, Erik Schlangen, Jiangxiong Wei, Qijun Yu

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Non-uniform stresses, strains and microcracking of the concretes with three coarse aggregate sizes (5–10 mm, 10–16 mm, 16–20 mm) dried under 40% relative humidity (RH) for 60 days were quantified using digital image correlation and lattice fracture modelling. The influencing mechanism of coarse aggregate size on the drying-induced microcracking of concrete was clarified: (1) As the coarse aggregate size decreases, propagation paths of microcracking are increased, which increase the number of small microcracks and release the drying shrinkage force from mortar phase. (2) Tensile stress shells surrounding the coarse aggregates become thinner, thereby decreasing the area of large microcracks. As the coarse aggregate size decreased from 16-20 mm to 5–10 mm, the average thickness of tensile stress shells decreased from 2.13 mm to 1.09 mm at the beginning of drying, and the area of the microcracks >5 μm in width decreased from 796.6 mm2/m2 to 340.2 mm2/m2 at 60 days since drying.

Original languageEnglish
Article number108880
Pages (from-to)1-18
Number of pages18
JournalComposites Part B: Engineering
Volume216
DOIs
Publication statusPublished - 2021

Keywords

  • Aggregate size
  • DIC
  • Drying shrinkage
  • Lattice modelling
  • Microcracks
  • Tensile stress shell

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