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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Concrete Mixtures Made with Ternary Blended Cements Containing Fly Ash and Rice-Husk Ash
Author(s): N. Bhanumathidas and P. Kumar Mehta
Publication: Special Publication
Appears on pages(s): 379-392
Keywords: blended cements; chloride penetration; compressive
strength; durability; fly ash; rice-husk ash; water-cementitious mate-rial
Abstract:Blending fly ash with normal portland cement enhances the durability and service life of concrete structures. Fly ash-based blended portland cements containing 1530% fly ash by mass are being increasingly used worldwide. These cements have been used in high-performance concrete for modem structures such as Petronas Towers, Euro-Tunnel, and Akashi-Kaikyo Bridge. High-volume fly ash concrete is another recent development according to which, large volumes of fly ash, 50-60% by mass of the total cementitious material, can be used in combination with a superplasticizer to overcome the slow rate of strength development in blended portland cements. The chloride permeability of unsuperplasticized, high-volume fly ash concrete at early ages is rather high, but it can be greatly reduced by the incorporation of either silica fume or a highly pozzolanic rice-husk ash. Rice-husk ash is a siliceous material produced by furnaces that use rice-husks as fuel. The rice-husk ash containing amorphous silica in cellular microstructure is a superpozzolan, and has proven to be a valuable material for making highly durable concrete. It also contributes to concrete strength at early ages. This paper describes a preliminary research study on the role of rice-husk ash in enhancing the properties of high-volume fly ash concrete, particularly the early-age strength and chloride impermeability.
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