Lightweight concrete must conform to which ASTM standard?

Lightweight concrete is specifically addressed by ASTM C330, which governs the requirements for structural lightweight aggregates used in concrete. This standard provides the specifications for the physical properties of the aggregates, the concrete mixture, and the testing methods for lightweight concrete. It ensures that lightweight concrete achieves specific performance criteria necessary for various construction applications while maintaining structural integrity and safety.

The other options refer to different standards: ASTM C150 pertains to Portland cement, ASTM C33 deals with the standard specification for aggregates for concrete, and ASTM C1611 covers the testing methods for self-consolidating concrete. While these are all relevant to concrete and construction practices, they do not specifically address the unique characteristics and requirements of lightweight concrete, making ASTM C330 the correct reference for this type of material.