Aggregate Surface Areas Quantified through Laser Measurements for South African Asphalt Mixtures
Publication: Journal of Transportation Engineering
Volume 138, Issue 8
Abstract
For several decades, efforts have been made by engineers and researchers in road and airfield pavements and railroads to develop methods/procedures for accurate quantification of aggregate shape and packing properties. The difficult part of the process has been the fact that aggregate particles have irregular and nonideal shapes. New research capabilities, including laser-based technology, can effectively address the difficulties associated with aggregate shape measurements to optimize asphalt mix design. This paper introduces the use of a three-dimensional (3D) laser scanning method to directly measure the surface area of aggregates used in road pavements in South Africa. As an application of the laser-based measurements, the asphalt film thicknesses of five typical South African mixtures were calculated and compared with the film thicknesses calculated from traditional methods. Based on the laser scanning method, new surface area factors were developed for coarse aggregates used in the asphalt mixtures. Overall, the study demonstrated applicability of 3D laser scanning method to characterize coarse aggregates.
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Acknowledgments
This study forms part of the CSIR R&D thematic research project TA-2011-001. The writers wish to acknowledge the R&D Office for providing the funding for the 3D laser scanning device and the thematic project.
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Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 138 • Issue 8 • August 2012
Pages: 1006 - 1015
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Nov 25, 2010
Accepted: Feb 9, 2012
Published online: Feb 13, 2012
Published in print: Aug 1, 2012
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