Answer :
Final answer:
The correct ASTM Standard for obtaining a concrete sample for testing is ASTM C31, which provides detailed procedures for the creation and curing of concrete test specimens.
Explanation:
The correct ASTM Standard for obtaining a concrete sample for testing is ASTM C31. This standard provides guidance on how to make and cure concrete test specimens in the field. Procedures detailed in ASTM C31 include the procedures for obtaining, molding, and curing cylindrical or beam test specimens. These procedures are critical to ensuring the concrete's quality for structural applications, making it a foundational standard for engineers and technicians in the construction industry. Other mentioned standards, such as ASTM D143, ASTM E329, and ASTM A36, serve different purposes, such as wood testing, standards of engineering firms, and carbon structural steel specifications, respectively, and are not related to concrete sample preparation.