A by-product of coal burning power plants, fly ash is used to enhance the performance characteristics of portland and masonry cement mixes. Improves workability, water retention, strength and durability when used in concrete, mortar and stucco mixes. Replaces up to 25% of the portland or masonry cement in cement mixes. Can also be mixed with soils for use in soil stabilization. Complies with ASTM C-618 specifications.