Abstract
Asphalt mixture is a complex composite material due to the unique behaviour of
bitumen and the variable microstructure. During fabrication the bitumen combines with
the very fine aggregate particles to form the bituminous mastic that involves coarse
aggregate particles and binds the mixture altogether. However, the bitumen
characteristics change over time due to ageing, and the changes in the bituminous
mastic affect asphalt’s performance and durability. The objective of this work is to
analyse the evolution in the ductility behaviour of bituminous mastic with ageing. Two
bituminous mastics fabricated with a paving grade bitumen and two mineral fillers were
aged at different levels and characterized. Mastic ageing was imposed with the
Pressure Ageing Vessel using different times of exposure in the chamber. The ductility
behaviour of mastics was evaluated by means of the double-edge-notched tension test
because it allows to distinguish the essential and plastic work contributions to ductile
failure. The results showed that bitumen ageing has a detrimental effect on the
performance of bituminous mastics. As expected, aged mastics become stiffer and less
ductile. The largest variation in properties occurred from the original mastic to the first
ageing level that simulated short-term ageing. The filler type affected the evolution of
ductility behaviour with ageing. Furthermore, this work demonstrates the importance of
using mastics in the characterization of asphalt materials instead of the bitumen.
bitumen and the variable microstructure. During fabrication the bitumen combines with
the very fine aggregate particles to form the bituminous mastic that involves coarse
aggregate particles and binds the mixture altogether. However, the bitumen
characteristics change over time due to ageing, and the changes in the bituminous
mastic affect asphalt’s performance and durability. The objective of this work is to
analyse the evolution in the ductility behaviour of bituminous mastic with ageing. Two
bituminous mastics fabricated with a paving grade bitumen and two mineral fillers were
aged at different levels and characterized. Mastic ageing was imposed with the
Pressure Ageing Vessel using different times of exposure in the chamber. The ductility
behaviour of mastics was evaluated by means of the double-edge-notched tension test
because it allows to distinguish the essential and plastic work contributions to ductile
failure. The results showed that bitumen ageing has a detrimental effect on the
performance of bituminous mastics. As expected, aged mastics become stiffer and less
ductile. The largest variation in properties occurred from the original mastic to the first
ageing level that simulated short-term ageing. The filler type affected the evolution of
ductility behaviour with ageing. Furthermore, this work demonstrates the importance of
using mastics in the characterization of asphalt materials instead of the bitumen.
| Original language | English |
|---|---|
| Title of host publication | Ductility behaviour of filler-bitumen mastics: effect of ageing |
| Number of pages | 9 |
| ISBN (Electronic) | 9789080288461 |
| Publication status | Published - 1 Jul 2020 |
| Event | 7th Eurasphalt & Eurobitume Congress - Madrid, Madrid, Spain Duration: 13 May 2020 → 14 May 2020 Conference number: 7 |
Conference
| Conference | 7th Eurasphalt & Eurobitume Congress |
|---|---|
| Country/Territory | Spain |
| City | Madrid |
| Period | 13/05/20 → 14/05/20 |