Preprint Article Version 1 This version is not peer-reviewed

Virtual Asphalt to Predict Roads’ Air Voids and Hydraulic Conductivity

Version 1 : Received: 27 October 2018 / Approved: 30 October 2018 / Online: 30 October 2018 (07:27:29 CET)

How to cite: Aboufoul, M.; Chiarelli, A.; Triguero, I.; Garcia, A. Virtual Asphalt to Predict Roads’ Air Voids and Hydraulic Conductivity. Preprints 2018, 2018100710 (doi: 10.20944/preprints201810.0710.v1). Aboufoul, M.; Chiarelli, A.; Triguero, I.; Garcia, A. Virtual Asphalt to Predict Roads’ Air Voids and Hydraulic Conductivity. Preprints 2018, 2018100710 (doi: 10.20944/preprints201810.0710.v1).

Abstract

This paper investigates the effects of air void topology on hydraulic conductivity in asphalt mixtures with porosity in the range 14%-31%. Virtual asphalt pore networks were generated using the Intersected Stacked Air voids (ISA) method, with its parameters being automatically adjusted by the means of a differential evolution optimisation algorithm, and then 3D printed using transparent resin. Permeability tests were conducted on the resin samples to understand the effects of pore topology on hydraulic conductivity. Moreover, the pore networks generated virtually were compared to real asphalt pore networks captured via X-ray Computed Tomography (CT) scans. The optimised ISA method was able to generate realistic 3D pore networks corresponding to those seen in asphalt mixtures in term of visual, topological, statistical and air void shape properties. It was found that, in the range of porous asphalt materials investigated in this research, the high dispersion in hydraulic conductivity at constant air void content is a function of the average air void diameter. Finally, the relationship between average void diameter and the maximum aggregate size and gradation in porous asphalt materials was investigated.

Subject Areas

computational design; optimisation; porosity; pore networks; X-ray CT; 3D printing

Comments (1)

Comment 1
Received: 30 April 2019
Commenter: Andrea Chiarelli
The commenter has declared there is no conflict of interests.
Comment: If interested, please find the final version on Powder Technology at: https://doi.org/10.1016/j.powtec.2019.04.072
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