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Computers and Concrete
  Volume 5, Number 1, February 2008, pages 75-88

Mathematical model of strength and porosity of ternary blend Portland rice husk ash and fly ash cement mortar
Sumrerng Rukzon and Prinya Chindaprasirt

    This paper presents a mathematical model for strength and porosity of mortars made with ternary blends of ordinary Portland cement (OPC), ground rice husk ash (RHA) and classified fly ash (FA). The mortar mixtures were made with Portland cement Type I containing 0-40% FA and RHA. FA and RHA with 1-3% by weight retained on a sieve No. 325 were used. Compressive strength and porosity of the blended cement mortar at the age of 7, 28 and 90 days were determined. The use of ternary blended cements of RHA and FA produced mixes with good strength and low porosity of mortar. A mathematical analysis and two
Key Words
    fly ash; rice husk ash; compressive strength; porosity; mortar.
Department of Civil Engineering, Faculty of Engineering, Graduate School, Khon Kaen University, Khon Kaen 40002, Thailand

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