Optimization of fly ash content in concrete: Part I: Non-air-entrained concrete made without superplasticizer |
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Authors: | N. Bouzoubaâ ,B. Fournier |
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Affiliation: | International Centre for Sustainable Development of Cement and Concrete (ICON), CANMET/Natural Resources Canada, 405 Rochester Street, Ottawa, ON, Canada K1A 0G1 |
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Abstract: | This paper outlines the preliminary results of a research project aimed at optimizing the fly ash content in concrete. Such fly ash concrete would develop an adequate 1-day compressive strength and would be less expensive than the normal Portland cement concrete with similar 28-day compressive strength. The results show that, in a normal Portland cement concrete having a 28-day compressive strength of 40 MPa, it is possible to replace 50% of cement by a fine fly ash (∼3000 cm2/g) with a CaO content of ∼13%, yielding a concrete of similar 28-day compressive strength. This concrete can be designed to yield an early-age strength of 10 MPa and results in a cost reduction of about 20% in comparison to the control concrete. In a case of a coarser fly ash (∼2000 cm2/g) with a CaO content of ∼4%, substitution levels of cement by this ash could be from 30% to 40%. This concrete yields a 1-day compressive strength of 10 MPa and a 28-day compressive strength similar to that of the control concrete. The total cost of this concrete is about 10% lower than that of the control concrete. |
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Keywords: | Fly ash Compressive strength Statistical analysis Cost |
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