results are given of an investigation into the relationship between the flexural strength and the rate of increase of extreme fibre stress of small beam specimens of two concretes. in addition, a limited investigation was made to determine the effect of rate of loading upon the fatigue performance, and the latter was related to the flexural strength at comparable stressing rates. the flexural strength was shown to be highly dependent upon rate of loading. at rates of loading approximating to the rates at which stress is applied in fatigue tests at 20hz, flexural strengths were about 50 per cent higher than those obtained under loading rates specified in the current british standard flexural test. no significant difference in fatigue performance was found in repeated loading tests on one concrete at loading frequencies of 4hz and 20hz. (a)

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