Blended fly ash cements - A review

This paper presents a review of research papers dealing with the production of blended fly ash cements published since the 1980s. The effects of grind ing fly ashes on their physical and chemical properties, and their effect o n the properties of mortars anc concretes incorporating the blended fly ash cements, are discussed. The production of blended fly ash cements produced by grinding portland cem ent clinker and fly ash together versus separate grinding of the materials followed by blending is described. The combined grinding of the portland ce ment clinker, fly ash, gypsum, and a superplasticizer to produce a blended cement is discussed, and reference is made to the optimum grinding processe s and the production of high-volume fly ash blended cements. The paper conc ludes with a list of recommendations for needed research.