What does ASTM C138 cover?

ASTM C138 specifically pertains to the determination of the density of freshly mixed concrete, which is often referred to as the unit weight. This standard outlines the procedures for measuring the density of concrete in its plastic state, which is vital for various reasons, including quality control in concrete production and ensuring the concrete mix meets specified requirements. Understanding the density helps in assessing the correct proportions of materials used, which ultimately impacts the overall strength and durability of the concrete once it cures.

In addition, knowing the density can aid in calculating the yield of concrete mixes and helps in compliance with specifications that may dictate particular density requirements. This standard is crucial for engineers and construction professionals who need verified measurements to ensure the structural integrity of their projects.