Abstract
Steel slag aggregates with three surface texture levels were produced by utilising Los Angeles abrasion machine so as to evaluate the influence of aggregate surface texture on porous asphalt mixtures (PAM). A series of laboratory measurements were conducted to determine PAM’s properties. Discrete element method (DEM) simulations were applied to obtain four packing parameters of porosity, coordination number, proportion of effective particles, and average contact force to assess the packing structure of corresponding PAM designs. The results indicated that aggregate surface texture significantly affects the mechanical properties of PAM, in which doubling the roughness of aggregate surface increases Marshall stability by around 16% and decreases permanent strain by about 40%. Rougher surface mitigates slippage between aggregates particles, thereby creating a more stable aggregate packing in PAM.
| Original language | English |
|---|---|
| Pages (from-to) | 1498-1508 |
| Number of pages | 11 |
| Journal | International Journal of Pavement Research and Technology |
| Volume | 15 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - Nov 2022 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2021, The Author(s), under exclusive licence to Chinese Society of Pavement Engineering.
ASJC Scopus Subject Areas
- Civil and Structural Engineering
- Mechanics of Materials
Keywords
- Aggregate surface texture
- Discrete element simulations
- Laboratory evaluation tests
- Porous asphalt mixture performance