Quantitative 2D Restrained Shrinkage Cracking of Cement Paste with Wollastonite Microfibers
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 9
Abstract
Plastic shrinkage cracking in restrained cement pastes reinforced with wollastonite particles of micro and submicron sizes was studied using a quantitative two-dimensional (2D) cracking experiment. A series of blended paste mixes with portland cement and different grades of wollastonite fibers were developed and tested under low vacuum conditions. Testing parameters included four grades of wollastonite with aspect ratio in the range of and average particle size ranging from 33 to 2,000 μm at 15% cement replacement. Wollastonite beneficially altered the shrinkage cracking morphology by arresting crack growth, wherein crack lengths and widths were reduced by a factor of two, and the area by a factor of three when compared with the control specimens. However, the initial evaporation rate, early age diffusivity, and cumulative moisture loss increased. Influence of the microfibers in controlling early age drying were related to the porosity of the microstructure using mercury intrusion porosimetry (MIP).
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Acknowledgments
The authors acknowledge NYCO Minerals, Inc., for the financial support of this study. Microstructural investigations were conducted at the Le-Roy Eyring Center for Solid State Science at the Arizona State University. The contribution of Dr. Mehdi Bakhshi in developing the computer program for the diffusion study is also appreciated. The MIP study on shrinkage specimens were performed at the Advanced Cementitious Systems at the Arizona State University. The authors wish to acknowledge Matthew Aguayo for his assistance in conducting the characterization study.
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© 2016 American Society of Civil Engineers.
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Received: Jul 9, 2015
Accepted: Jan 11, 2016
Published online: Apr 12, 2016
Published in print: Sep 1, 2016
Discussion open until: Sep 12, 2016
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