Fly Ash Increases Resistance of Concrete to Sulfate Attack

摘要

Fly ash is defined as fine solid particles of non-combustible ash carried out of a bed of solid fuel by the draft. Pozzolan, originating from the Italian pozzolana, is a silicious or aluminous substance that reacts chemically with slacked lime in the presence of moisture to form a cementitous material. The study reported in the booklet details the capabilities of bituminous coal fly ash as a pozzolan to combat resistance of concrete to sulfate attack. The tests showed that bituminous coal fly ashes consistently produce increased sulfate resistance over similar concrete without fly ash. The findings and details of the tests should be of interest and value to water resource agencies, cement manufacturers and testing laboratories, colleges and universities, and other interested parties in the cement and concrete industries.