Which ASTM specification describes the basis for calculating the volume of ready mix concrete?

The correct choice regarding the ASTM specification that outlines the basis for calculating the volume of ready mix concrete is ASTM C94. This standard specification specifically addresses the requirements for the dimensional properties of ready mixed concrete, including the necessary information on batching, mixing, and delivery of concrete to ensure it meets the desired performance characteristics.

ASTM C94 provides guidelines on how to ensure the concrete mixture is accurately prepared in terms of quantity and quality, which is crucial for achieving the appropriate volume. This is particularly important for project planning and cost estimation, where precise calculations of concrete volume help contractors ensure that they order the correct amount and meet the specifications for their construction projects.

The other specifications listed serve different purposes. ASTM C150 relates to portland cement, detailing its requirements and classifications. ASTM C33 covers the specifications for concrete aggregates, outlining the quality and grading of materials included in the mix. ASTM C231 pertains to the density of concrete and air content, rather than the volume calculation itself. Understanding the specific focuses of these standards helps clarify why ASTM C94 is the relevant choice in this context.