Pore Structure Characterization of Pervious Concrete Using X-Ray Microcomputed Tomography
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 6
Abstract
Pervious concrete (PC) is a class of porous materials that has found application in building materials, specifically in pavements, for its stormwater mitigation abilities. X-ray microcomputed tomography was used to understand and quantify the three-dimensional (3D) pore morphology, shape factors, and size descriptors in PC mixtures prepared with varying porosity. The Zingg pore shape classification indicated higher percent of rod-shaped pores and the frequency of spheroid-form pores was higher in single-sized mixtures, whereas dense mixtures had higher occurrence of blade-form pores. The average pore sphericity was in the range of 0.40–0.60, indicating semispherical pores. Few large-sized pores in PC had a significant influence on the relation between 3D pore-structural-permeability properties. The visualization of 3D pore structure indicated the importance of isolated pores in PC for periodic maintenance. The new findings on the pore structure will assist in mix design optimization, selection of mixtures, and modeling of PC.
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Acknowledgments
The authors gratefully acknowledge the Government of India Ministry of Human Resource Development Department of Higher Education for financial support vide Future of Cities research project Grant No. F. No. 4-22/2014-TS.I, dated January 23, 2014; professor in charge and operator, X-ray micro-CT lab, Central Research Facility, Indian Institute of Technology Kharagpur, India; and professor in charge and operator, Material Testing Laboratory, Structural Engineering Section, Department of Civil Engineering, IIT Kharagpur, India.
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 6 • June 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Dec 20, 2016
Accepted: Nov 21, 2017
Published online: Apr 9, 2018
Published in print: Jun 1, 2018
Discussion open until: Sep 9, 2018
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