The problems occur when there is a wide definition of what meets the standard, or when complying materials are put together and the results are less than satisfactory. ![]() Most project specifications will cite many material standards for the materials that go into making concrete - ASTM C150 Cement, C618 Fly ash, C989 Slag, C494 Admixtures, C33 for Aggregate, and so on. Question: Why are ASTM standards important and why should concrete producers pay attention and follow them?Īnswer: ASTM standards are designed to allow a “meeting of the minds” between the purchaser and the vendor. ![]() Excess strength versus sample CuSum chart.
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