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.
| Original language | English |
|---|---|
| Article number | 3801 |
| Journal | Journal of Materials in Civil Engineering |
| Volume | 33 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - Aug 1 2021 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2021 American Society of Civil Engineers.
ASJC Scopus Subject Areas
- Civil and Structural Engineering
- Building and Construction
- General Materials Science
- Mechanics of Materials
Keywords
- Aggregate shape properties
- Discrete-element simulations
- Laboratory evaluation tests
- Porous asphalt mixture performance
- Rigid shape-controlled aggregates