ASTM C637-20 PDF Download

ASTM C637-20 is a standard specification that outlines the requirements for aggregates used in radiation-shielding concrete. The purpose of this specification is to ensure the appropriate composition and high specific gravity of the aggregates, which are essential for effective radiation shielding.

The aggregates covered by this specification can be natural minerals with high density or high fixed water content. Examples of these minerals include barite, magnetite, hematite, ilmenite, and serpentine. Synthetic aggregates like iron, steel, ferrophosphorus, and boron frit or other boron compounds are also included. Additionally, both fine and coarse aggregates are addressed, with fine aggregate consisting of natural or manufactured sand that may contain high-density minerals, and coarse aggregate consisting of crushed ore, crushed stone, synthetic products, or combinations thereof.

To meet the requirements of this specification, the aggregates must demonstrate uniformity of specific gravity and fixed water content. They must also meet the specified chemical composition for various materials like serpentine, limonite, goethite, barite, ilmenite, hematite, magnetite, iron, ferrophosphorus, boron frit, boron carbide, and calcium carbide.

It is important to note that this standard includes explanatory notes and footnotes, which provide additional information but are not considered as requirements of the standard itself.