Crack velocities in concrete subjected to impact loading
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A high-speed video camera, operating at 1000 frames per second, was used to determine crack velocities in concrete blocks subjected to impact loading. The impact loads were generated using a large, instrumented drop-weight impact machine, capable of dropping a 504 kg mass through heights of up to 2.5 m. Specimens in the form of 254 mm cubes were subjected to splitting tension using the impact machine. Plain concrete, and concretes reinforced with two different types of discontinuous steel fibres (fibre volumes of 0.77%) were tested. It was found that steel fibres both reduced the observed crack velocities, and increased the fracture energies.
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2014 ◽
Vol 644-650
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pp. 167-170
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2011 ◽
Vol 354-355
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pp. 609-614
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