![]() In some cases, such as shrinkage results under ASTM C426 (ref. ![]() Choosing units from one portion of a pallet, or choosing the most or least desirable units may misrepresent the properties of the lot.Īlthough a shipment may consist of several different unit configurations, samples for testing should all have the same configuration and dimensions. Consequently, concrete masonry units chosen for testing should be randomly sampled. The purpose of selecting multiple samples for unit testing is to ensure that the range of results is representative of the entire lot of units from which the specimens were taken. ![]() SAMPLING & TESTING CONCRETE MASONRY UNITS, ASTM C140 Unit Sampling
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