The organization that publishes the technical standards for testing and specifying construction materials.
ASTM International (formerly the American Society for Testing and Materials) is a global standards organization that develops and publishes technical standards for materials, products, systems, and services across many industries. In construction, ASTM standards govern testing procedures, material specifications, and performance requirements for concrete, steel, wood, masonry, roofing, and dozens of other materials. Specifications routinely reference ASTM standards by designation (e.g., ASTM A615 for deformed rebar, ASTM C150 for Portland cement).
The concrete specification requires aggregate conforming to ASTM C33, ensuring the aggregate gradation meets the standard before use.
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