ASTM C637-20,Standard Specification for Aggregates for Radiation-Shielding Concrete.
ASTM C637-20 covers special aggregates and/or high-density aggregates for use in radiation-shielding concretes in which composition or high specific gravity, or both, are of prime consideration.
3. Terminology
3. 1 Definitions
3. 1. 1 For definitions of terms used in this standard, refer to Terminologies C125 and C219.
4. Classification
4. 1 Aggregates covered by this specification include:
4. 1.1 Natural mineral aggregates of either high density or high fixed water content, or both. These include aggregates that contain or consist predominately of materials such as barite,magnetite, hematite, ilmenite and serpentine.
4. 1. 2 Synthetic aggregates such as iron, steel, ferrophorus and boron frit or other boron compounds (see Descriptive Nomenclature C638)
4.1.3 Fine aggregate consisting of natural or manufactured sand including high-density minerals. Coarse aggregate may consist of crushed ore, crushed stone, or synthetic products, or combinations or mixtures thereof.
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