Aggregate is another term for sand, gravel, crushed stone, slag and expanded shale.
Inc. The purpose of the Indiana Mineral Aggregates Association is to solve common problems of the Indiana aggregate producing industry, principally in the areas of specifications for aggregates, mine safety and reclamation, air and water pollution, legislation, research for improvements in aggregates used, increasing public awareness of the importance of aggregate products in their daily lives, and broadening the use and application of aggregates in Indiana. The IMAA endeavors to cover matters concerning the aggregate industry in Indiana that are now difficult or impossible for national aggregate associations to handle.