Carbon Neutral Off-White Rice Husk Ash as a Partial White Cement Replacement
Publication: Journal of Materials in Civil Engineering
Volume 22, Issue 10
Abstract
Large amounts of rice husk ash (RHA) are produced every year worldwide, and difficulties related to its disposal may cause this product to become an environmental hazard. Owing to its high amorphous silica content, RHA has shown to be a valid supplementary cementing material in the production of concrete. This paper presents the physical and chemical properties of a new generation RHA that is off-white in color, is carbon neutral, and has no crystalline and toxic metals. The effects on mechanical properties of a mixture using off-white rice hull ash (OWRHA) as partial replacement of white cement were also investigated. The OWRHA-blended concrete has higher compressive and splitting tensile strengths at various ages compared with the control mixture. It is shown that up to 15% of OWRHA could be advantageously blended with white cement to enhance white concrete performance without modifying the aesthetics of the final product.
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Acknowledgments
The writers would like to acknowledge the National Science Foundation financial support in the form of SBIR Phase II founding and the grant number for the project NSFNSF 0724463. The contribution of materials and help from Artistic Stones Inc. (Miami, Fla.) is gratefully acknowledged. Dr. Clarissa Ferraris from the National Institute of Standards and Technology is acknowledged for the help and assistance with the determination of the particle size distribution.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 22 • Issue 10 • October 2010
Pages: 1078 - 1083
Copyright
© 2010 ASCE.
History
Received: Sep 3, 2009
Accepted: Apr 15, 2010
Published online: Apr 19, 2010
Published in print: Oct 2010
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