An accelerated test for the seven‐ and twenty‐eight‐day compressive strengths of concrete

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Abstract
As it is usually impossible to remove work made of concrete not up to standard at an age of 28 days (because there is much more recent work on top of it), in place of the present‐day standard test for concrete, viz., the crushing strength of sample cubes 28 days after casting, a test has been evolved to predict the 7‐ and 28‐day strengths in as little as 7 hours. The sample cubes are subjected to a specified heating procedure, after which their immediate crushing strength can be used to predict the value at 7 or 28 days, by means of curves established experimentally. These have been checked with a wide range of concrete mixes, and with a wide range of cements, and in general, predict with a standard deviation of less than 200 lb./sq. in. at 7 days and 225 lb./sq. in. at 28 days. This is in general more consistent than the results at 28 days on site samples of what is reputedly the same concrete.

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