X-Ray Computed Tomography and Nondestructive Evaluation of Clogging in Porous Concrete Field Samples
Publication: Journal of Materials in Civil Engineering
Volume 24, Issue 8
Abstract
This study aims to investigate and quantify the fraction of clogging in pervious concrete samples cored from parking lots. Image observation, analysis, and processing of representative cores retrieved from parking lots enabled qualitative relation of porosity with clogging. Porosity profiles obtained from processing of computed tomography (CT) scanned images were used to assess the nature and extent of clogging. Significantly lower porosity values were computed for old cores compared to newer ones. It was also observed that samples manifested clogged behavior because of high cement paste (mortar) content. Porosities of samples were calculated, for comparison using a gravimetric method and the clogged fraction in the cores was quantified by recalculating porosities of specimens scanned after vacuum cleaning. X-ray CT scanning proved a useful tool to study clogging, and the clogged fraction varied from 1.48% in sample PL 12-1 to 11.15% in sample QP 45-3.
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Acknowledgments
Partial financial support was provided by the California Department of Transportation, Division of Environmental Analysis through the University of California at Davis. The authors are thankful to Mr. Dane Anderson and the staff of the University of California Pavement Research Center for their assistance on sample coring and to the staff of the Washington State University WAX-CT Laboratory who assisted in CT scanning and image analysis The views expressed by the authors are their own, and the California Department of Transportation does not endorse the viewpoint of a publication.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 24 • Issue 8 • August 2012
Pages: 1103 - 1109
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Jun 25, 2011
Accepted: Jan 23, 2012
Published online: Jan 25, 2012
Published in print: Aug 1, 2012
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