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During the past 100 or more years many tests have been developed and applied to assess the quality of concrete aggregates. This paper is a discussion of the significance of five aggregate quality tests currently in use. One of them, the sulfate soundness test (ASTM Test for Soundness of Aggregates by Use of Sodium Sulfate or Magnesium Sulfate (C 88)), is perhaps the most widely used of all methods for determining the overall quality of aggregate. The other four tests are used to determine the presence of specific harmful particles or substances which influence the mix proportions of fresh concrete or its early stage hardening, or which damage the concrete surface under specific circumstances.
Consultant petrologist, Toronto, Ontario