Effect of Aggregate Shape Properties on Performance of Porous Asphalt Mixture
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 8
Abstract
Aggregate shape properties can greatly influence the overall performance of asphalt mixtures. In this study, shape-controlled aggregates were fabricated and used in porous asphalt mixture (PAM) to assess the effect of aggregate shape properties on the performance of PAM. Three shapes of the aggregates were fabricated, namely cube, cylinder, and sphere. Two parameters, shape factor and sphericity index, were used to define the aggregate shape properties. Results of discrete-element method (DEM) simulation and laboratory measurements were compared to obtain a better understanding on the effect of aggregate shape on the performance of PAM. The results indicated that aggregate shape properties have notable effect on the overall performance of PAM. Spherical aggregates need only a low compaction effort to achieve the design voids-in-total-mix (VTM). For aggregates with the same shape factor, the overall mechanistic properties of PAM generally decrease with increasing sphericity of the aggregates.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors gratefully acknowledge Samwoh Corporation and Shell Singapore for providing granite and PG-76 binder, respectively. This study was performed as part of the first author’s Ph.D. research project at Nanyang Technological University, Singapore. The Ph.D. candidature is financially supported by the Indonesia Endowment Fund for Education.
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© 2021 American Society of Civil Engineers.
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Received: Aug 4, 2020
Accepted: Dec 15, 2020
Published online: Jun 14, 2021
Published in print: Aug 1, 2021
Discussion open until: Nov 14, 2021
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