Answer :
Final answer:
ASTM Standard C172 is the required reference for obtaining a concrete sample for testing, ensuring that sample collection is done consistently and represents the entire concrete batch accurately.
Explanation:
The ASTM Standard that is required for obtaining a concrete sample for use in a test method is ASTM Standard C172. This standard is specifically designed for the sampling of fresh concrete and prescribes procedures to ensure that tests conducted on the concrete samples accurately reflect the true nature of the concrete in question. It is crucial to follow this standard to maintain consistency in sample collection and to obtain results that are representative of the entire batch of concrete. Failure to adhere to ASTM C172 can lead to inaccurate results in concrete testing, which may then affect decisions related to the quality and usability of the concrete batch.