Answer :
Final answer:
Concrete samples for molding tests should be retrieved and handled following the ASTM C172/C172M standard. This provides the process for consistent and accurate sampling of freshly mixed concrete.
Explanation:
The sample of concrete used in molding test specimens must be obtained in accordance with the ASTM C172/C172M standard. This is a standard set by the American Society for Testing and Materials (ASTM) for sampling freshly mixed concrete. It outlines procedures including the frequency of sampling, size of sample, and handling of the sample to ensure consistent and reliable results. Essentially, the ASTM C172/C172M guides the act of obtaining and testing concrete to evaluate its compliant to the desired specifications.
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