Aggregates must conform to which ASTM standards to ensure they are suitable for concrete?

The appropriate standards for aggregates used in concrete are ASTM C33 and ASTM C330. ASTM C33 establishes the standard specifications for concrete aggregates, which include all types of aggregates used in concrete construction, ensuring their quality and uniformity. This standard covers the physical and chemical properties of aggregates that influence the strength, durability, and workability of concrete.

ASTM C330, on the other hand, specifies lightweight aggregates for structural concrete. Lightweight aggregates are sometimes utilized to reduce the overall weight of concrete, improve insulation properties, and enhance the handling characteristics on construction sites.

By conforming to these standards, aggregates are confirmed to be suitable for concrete applications, as they address characteristics such as cleanliness, grading, and specific gravity. This ensures that the concrete achieves the desired performance and meets safety and durability requirements.