Abstract
The distribution of strength within a series of five 2·2 m × 0·5 m × 0·3 m laboratory reinforced concrete beams has been examined, with the aid of non-destructive and partially destructive testing techniques, as well as cores. Four different types of lightweight concrete have been tested and compared with a normal weight gravel concrete. Results have also been compared with tests on standard cube specimens. Results demonstrate the influence of concrete type upon in-place strength distribution and variability, as well as the relationship to standard cube strength. Some discrepancies have been found between the results from different test methods, and these are considered in detail. It is concluded that whilst materials factors of safety commonly used in design are likely to allow adequately for strength differences between cubes and in-place concrete, planning and interpretation of in-situ testing programmes may in some cases require modification from the established procedures for normal weight concretes.
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