Insulating Concrete Lightweight Aggregates Specification by ASTM International

This standard outlines lightweight aggregates for concrete unexposed to weather, prioritizing thermal insulation. It classifies aggregates into groups I (expanded products like perlite or vermiculite) and II (expanded, calcined, or sintered products like blast-furnace slag, clay, etc., or processed natural materials). The concrete's thermal insulation must meet specified conductivity limits. Regular fineness modulus checks ensure shipment consistency. The aggregate should mainly consist of lightweight inorganic cellular and granular materials. Testing involves specimen preparation, density determination, and thermal conductivity measurement. Delivered packages must clearly display the manufacturer's name, aggregate type, and contents' minimum mass and volume.

• Aggregate Use: This specification focuses on lightweight aggregates for concrete not exposed to weather, prioritizing thermal insulation
• Notes & Footnotes: Explanatory notes and footnotes are included, but they are not considered requirements
• Sieve Sizes: Inch-pound units are shown for user convenience, with standard sieve designations in parentheses
• Safety Responsibility: Users must establish safety practices and determine regulatory limitations, as this standard doesn't cover all safety concerns
• Standard Development: This international standard was developed following recognized TBT principles