Answer :
Final answer:
ASTM Standard C31 outlines procedures for obtaining concrete samples for testing in the lab, hence the correct answer is b) ASTM C31.
Explanation:
The ASTM Standard C31 delineates the specific protocols for acquiring concrete samples to be used in laboratory testing. This standard provides comprehensive guidelines and procedures aimed at ensuring the accuracy and reliability of the testing process.
By following the instructions outlined in ASTM C31, professionals in the construction and engineering fields can obtain representative concrete samples that accurately reflect the characteristics of the material being tested. Adhering to these standardized procedures facilitates consistency in sample collection, minimizes variability in test results, and ultimately enhances the quality and reliability of concrete testing conducted in laboratory settings.