1. A multiscale model for post-peak softening response of concrete and the role of microcracks in the interfacial transition zone
- Author
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Keerthy M. Simon and J.M. Chandra Kishen
- Subjects
Aggregate (composite) ,Materials science ,Mechanical Engineering ,0211 other engineering and technologies ,02 engineering and technology ,Civil Engineering ,Critical length ,020303 mechanical engineering & transports ,Fracture toughness ,0203 mechanical engineering ,021105 building & construction ,Transition zone ,Fracture (geology) ,Composite material ,Softening ,Displacement (fluid) ,Elastic modulus - Abstract
The effect of microcracks ahead of a macrocrack on the post-peak behavior of concrete-like quasi-brittle material is studied. The critical length of a microcrack is estimated by considering a small element near the macrocrack tip and defining the critical crack opening displacement of the microcrack that exist in the interface region between the aggregate and cement paste. A fracture model is proposed to predict the post-peak response of plain concrete. This model is validated using the experimental results for normal-strength, high-strength and self-consolidating concretes available in the literature. Through a sensitivity analysis, it is observed that the elastic modulus of concrete and the fracture toughness of the interface have a substantial influence on the critical microcrack length.
- Published
- 2018
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