TY - GEN
T1 - Tribological characterization of graphene nano-platelet (GNP) bituminous binders
AU - Ingrassia, Lorenzo Paolo
AU - Lu, Xiaohu
AU - Marasteanu, Mihai
AU - Canestrari, Francesco
PY - 2019/1/1
Y1 - 2019/1/1
N2 - According to recent research, the addition of graphene nano-platelets (GNPs) to bitumen can lead to a considerable improvement of the compactability of bituminous mixtures, without reducing the viscosity of the binder, meaning that other mechanisms are responsible for this phenomenon. In this regard, the present study focuses on the characterization of the lubricating behaviour of GNP binders obtained by adding 3% and 6% GNPs to a plain PG 58-28 bitumen, through a novel tribological approach recently proposed in literature. In addition, the experimental program is completed by viscosity tests. Results show that GNP addition leads to an increase in both viscosity and friction, which in general is greater for higher GNP contents, for all testing temperatures. A good correlation between viscosity and minimum friction exists in the elasto-hydrodynamic regime of lubrication, whereas the results obtained in the boundary and mixed regimes may be significantly affected by the testing conditions considered. Specifically, the use of different substrates is suggested for future work, in order to achieve a better understanding of the mechanisms that govern the compaction behaviour of bituminous mixtures.
AB - According to recent research, the addition of graphene nano-platelets (GNPs) to bitumen can lead to a considerable improvement of the compactability of bituminous mixtures, without reducing the viscosity of the binder, meaning that other mechanisms are responsible for this phenomenon. In this regard, the present study focuses on the characterization of the lubricating behaviour of GNP binders obtained by adding 3% and 6% GNPs to a plain PG 58-28 bitumen, through a novel tribological approach recently proposed in literature. In addition, the experimental program is completed by viscosity tests. Results show that GNP addition leads to an increase in both viscosity and friction, which in general is greater for higher GNP contents, for all testing temperatures. A good correlation between viscosity and minimum friction exists in the elasto-hydrodynamic regime of lubrication, whereas the results obtained in the boundary and mixed regimes may be significantly affected by the testing conditions considered. Specifically, the use of different substrates is suggested for future work, in order to achieve a better understanding of the mechanisms that govern the compaction behaviour of bituminous mixtures.
KW - Bituminous binders
KW - Graphene nano-platelet (GNP)
KW - Lubrication
KW - Nanomaterials
KW - Tribology
UR - http://www.scopus.com/inward/record.url?scp=85073893719&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85073893719&partnerID=8YFLogxK
U2 - 10.1061/9780784482476.011
DO - 10.1061/9780784482476.011
M3 - Conference contribution
AN - SCOPUS:85073893719
T3 - Airfield and Highway Pavements 2019: Innovation and Sustainability in Highway and Airfield Pavement Technology - Selected Papers from the International Airfield and Highway Pavements Conference 2019
SP - 96
EP - 105
BT - Airfield and Highway Pavements 2019
A2 - Al-Qadi, Imad L.
A2 - Ozer, Hasan
A2 - Loizos, Andreas
A2 - Murrell, Scott
PB - American Society of Civil Engineers (ASCE)
T2 - International Airfield and Highway Pavements Conference 2019: Innovation and Sustainability in Highway and Airfield Pavement Technology
Y2 - 21 July 2019 through 24 July 2019
ER -