Abstract
The influence of fibre reinforcement on crack propagation in concrete was studied by tests on large double torsion specimens, 48 inches long, 16 inches wide, and 2 inches thick (1220 × 406 × 51 mm). Several different types of fibres were used: fibreglass, straight steel fibres, and deformed steel fibres. The results indicated that the fracture toughness increased with fibre content up to about 1.25% fibres by volume, and then decreased. This decrease in fracture toughness at higher fibre contents was related to a decrease in density of the specimens due to incomplete compaction. It was also found that, for this particular specimen geometry, fibres did not significantly restrain crack growth. Differences in the type of fibre did not significantly affect the slope and intercept of the crack velocity vs. stress intensity (V-Kl) curves.
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