Aggregate Project

Lightweight Aggregates

Lightweight aggregates are no longer produced locally. The expanded shale aggregates typically used as coarse aggregate in structural lightweight concrete are produced in accordance with ASTM C330, and shipped to concrete suppliers in the Bay Area from places such as Colorado and Texas. Recent experience suggests that it is difficult to achieve the 115 pcf concrete required for fire rating of steel deck assemblies with the aggregates currently available. Care should be taken to ensure that load-carrying capacity of structural members are adequate to support lightweight concrete with an equilibrium dry density of 120 pcf.

Structural Engineers Association of Northern California • Construction Quality Assurance Committee
	Bay Area Concrete Aggregates
Introduction Aggregate Basics ASTM C 33 Caltrans Standards Bay Area Aggregate History Light-weight Aggregates Bay Area Aggregate Producers Specifying Concrete Aggregates Aggregate Costs & Supply	Lightweight Aggregates Lightweight aggregates are no longer produced locally. The expanded shale aggregates typically used as coarse aggregate in structural lightweight concrete are produced in accordance with ASTM C330, and shipped to concrete suppliers in the Bay Area from places such as Colorado and Texas. Recent experience suggests that it is difficult to achieve the 115 pcf concrete required for fire rating of steel deck assemblies with the aggregates currently available. Care should be taken to ensure that load-carrying capacity of structural members are adequate to support lightweight concrete with an equilibrium dry density of 120 pcf.	Home


Producers: Hanson CEMEX Syar Vulcan Graniterock West Coast Aggregates Granite Construction