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  Effect of Creep on Bursting Resistance of Plain and Fibre Reinforced Concrete

  Resistance to ram thrust pressure in pre-cast concrete tunnel segments is an important consideration in the design of both the concrete mix and reinforcement comprising tunnel segments. Duration of loading is known to affect the apparent strength of concrete in compression, flexure, and direct tension, but its effect on bursting resistance is poorly understood. The capacity of plain and fibre reinforced concrete to resist bursting stresses is normally assessed using short-term tests such as Brazil splitting tests conducted on companion cast concrete cylinders. The current investigation has assessed the effect of creep on plain concrete, and fibre reinforced concrete made with either macrosynthetic or steel fibres, to determine whether load durations of up to 24 hours influence the apparent bursting resistance compared to short-term loading typical of standard tests which last only a few minutes. The objective has been to examine the relationship between short-term splitting test results and longer-term bursting resistance.

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