Air Void Characterization in Sand-Sulfur-Bitumen Mixes
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 9
Abstract
This paper represents an attempt to study the internal structure of sand-sulfur-bitumen (SSB) mixes with the help of effective and quick three-dimensional (3D), high-resolution technology such as X-ray micro-computed tomography coupled with digital image processing tools. Various air void parameters, such as air void content, connected air void content, size and shape of air void, and tortuosity of compacted specimens, were determined and compared with those of a conventional dense graded bituminous mixture. Further, a statistical approach was used to fit the distribution of air void size in SSB mixes based on a lognormal function. The associated scale and location parameters of the lognormal function were used to evaluate the influence of various factors such as type of filler, use of crusher dust, and variation in bitumen content on the distribution of air void size. A substantial improvement in the air void characteristics and tortuosity was observed with the addition of fillers and crusher dust, although the effects of filler type were not significant.
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Acknowledgments
The authors gratefully acknowledge the support of the Indian Institute of Technology, Kharagpur, West Bengal, India, for allowing them to use the X-ray CT facility for image acquisition. The writers also express their thanks to the technical and nontechnical staff of the Highway Laboratory of the National Institute of Technology, Rourkela, Odisha, India, for their assistance during material collection and specimen preparation.
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 9 • September 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jul 13, 2018
Accepted: Apr 1, 2019
Published online: Jun 24, 2019
Published in print: Sep 1, 2019
Discussion open until: Nov 24, 2019
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