Abstract
The variation in the compressive strength of 57 types of concrete, produced by 11 ready mixed concrete plants, was determined and compared with the variation in the strength of its site produced counterpart. It was found that strength variation in ready mixed concrete is not necessarily lower than that of site produced concrete, and it was concluded that formal compliance with a set of nominal requirements cannot alone secure an expected level of control and the corresponding assumed variation in concrete strength. It was further concluded that strength variation is much more dependent on the actual level of supervision rather than on the methods of production proper, the available equipment etc. Although ready mixed concrete plants may potentially produce concrete of low strength variation, due caution should be exercised in estimating its actual value.
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