The acceptance criteria for both brick and concrete block masonry units are reviewed and compared to those of concrete. Modifications in the acceptance criteria for masonry units are recommended which limit the amount by which the strength of any masonry unit may fall below the specified value. Probabilistic methods are used to develop equations which provide uniform, reliable compliance with both the existing and recommended acceptance criteria. It is shown that the producer of masonry units who exercises high standards of quality control is rewarded with a higher design strength. The producer who conducts more than minimum testing is similarly rewarded.
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