Pozzolanic and Cementitious Byproducts as Mineral Admixtures for Concrete - A Critical Review


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Title: Pozzolanic and Cementitious Byproducts as Mineral Admixtures for Concrete - A Critical Review

Author(s): P. Kumar Mehta

Publication: Special Publication

Volume: 79


Appears on pages(s): 1-46

Keywords: admixtures; alkali-aggregate reactions; blast furnace slag; compressive strength; concrete durability; fly ash; hydration; particle size distribution; permeability; pozzolans; rheological properties; rice;

Date: 5/1/1983

Granulated blast furnace slag and low-calcium fly ashes have long been used as portland cement additives or as mineral ad-mixtures in concrete. With the addition of high-calcium fly ash, rice husk ash, and condensed silica fume to the list of traditional mineral admixtures, a scientific approach for characterization and evaluation of all industrial byproducts which are suitable for use as admixtures in concete is needed. Since it is not the source of origin or the chemical composition of a mineral admixture but the mineralogical composition and particle characteristics which determine its contribution to concrete behavior, in this review the entire area is treated as a unified discipline. This approach seems to provide a better basis for explaining the similarities and differences in behavior between mineral admixtures originating from either the same or different sources. Mineralogical compositions, particle characteristics, current production rates, and utilization of major pozzolanic and industrial byproducts available in the United States and Canada are included. Mechanisms by which the use of these byproducts in portland cement concrete can improve engineering properties are discussed, and examples of data from field and laboratory investigations are given.