FraMCoS 8 2013 Toledo, Spain

Fracture Behaviour of Concrete at High Strain Rate

The design of concrete structures subjected to impact loads needs a significant level of knowledge of the constituent materials behaviour at higher strain-rates. In this paper are analysed the influence of the strain rate on the fracture behaviour considering the…

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Year 2013
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Abstract

The design of concrete structures subjected to impact loads needs a significant level of knowledge of the constituent materials behaviour at higher strain-rates. In this paper are analysed the influence of the strain rate on the fracture behaviour considering the tensile strength and fracture energy. A large number of direct tensile tests on plain concrete specimens performed at high strain- rates by means of a modified Hopkinson bar are reviewed. These results at high-strain-rate tests represent different concretes, with different maximum aggregate size, size and curing histories. The experiments had shown a significant increases of the tensile strength, failure strain and fracture energy as the strain-rates increase. Finally, results obtained using a special set-up of modified Hopkinson bar able to follow the crack propagation at high strain rate are presented.