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Computers and Concrete Volume 7, Number 4, August 2010 , pages 387-402 DOI: https://doi.org/10.12989/cac.2010.7.4.387 |
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Obtaining equivalent fracture toughness of concrete using uniaxial compression test |
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Zongjin Li and Yanhua Zhao
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| Abstract | ||
| From typical stress-axial strain curve and stress-volume strain curve of a concrete under uniaxial compression, the initiation and localization of microcracks within the interior of the specimen can be identified. The occurrence of random microcrack indicates the end of the linear elasticity, and the localization of microcrack implies formation of major crack, which triggers the onset of unstable crack propagation. The interval between initiation and localization of microcracks is characterized by a stable microcrack growth. Based on fracture behavior observed from a uniaxial compressive test of a concrete cylinder, a model has been developed to extract fundamental fracture properties of a concrete, i.e. the equivalent fracture toughness and the size of fracture process zone. The introduction of cracking Poisson | ||
| Key Words | ||
| concrete, microcrack, stress-strain relation, fracture toughness, uniaxial compression. | ||
| Address | ||
| Zongjin Li: Dept. of Civil and Environmental Engineering, HongKong University of Science & Technology, Hong Kong, China Yanhua Zhao: Dept. of Civil Engineering, Dalian University of Technology, Dalian, China | ||