What is the purpose of ASTM C31/C31m?

The purpose of ASTM C31/C31m is to provide a standardized procedure for making and curing concrete test specimens in the field. This standard emphasizes the importance of obtaining accurate and representative data regarding the properties of concrete as it will be used in the actual construction environment.

By following the guidelines set forth in this standard, practitioners can ensure that the specimens reflect the concrete's performance characteristics. The process includes how to take samples directly from the concrete batch, how to shape those samples for testing, and how to properly cure them. This standard is critical because it directly impacts the reliability of the strength tests performed on the specimens, which are essential for evaluating the quality and durability of concrete in construction projects.

Other options focus on different aspects of concrete testing or quality assessment but do not specifically address the procedures for making and curing test specimens as outlined in ASTM C31/C31m.