Effect of Natural Wollastonite Microfibers on Early-Age Behavior of UHPC
Publication: Journal of Materials in Civil Engineering
Volume 24, Issue 7
Abstract
In this study, the effect of incorporating wollastonite microfibers in ultrahigh performance concrete (UHPC) on its early-age properties was investigated. Wollastonite microfibers were added at 0, 4, 8, and 12% as partial volume replacement for cement. Results show that the early-age properties of UHPC mixtures incorporating wollastonite microfibers are highly affected by the microfiber content and aspect ratio. Increasing the wollastonite microfiber content resulted in a compressive strength comparable to or higher than that of the control mixture without microfibers. Wollastonite microfibers reduced shrinkage strains and increased cracking resistance compared to that of the control mixture. However, no significant improvement in the flexural behavior was achieved with the addition of wollastonite microfibers because of a sudden rupture of microfibers within the matrix. Wollastonite microfibers can act as an internal restraint for shrinkage, reinforcing the microstructure at the microcrack level, and leading to an enhancement of the early-age engineering properties of UHPC matrix. Partially replacing cement with natural wollastonite microfibers leads to a reduction in the cement factor, which represents economic and environmental benefits.
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Published In
Journal of Materials in Civil Engineering
Volume 24 • Issue 7 • July 2012
Pages: 816 - 824
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Mar 14, 2011
Accepted: Dec 28, 2011
Published online: Dec 29, 2011
Published in print: Jul 1, 2012
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