A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Development of a simple and quantitative oil exudation test for asphalt binder
Abstract Asphalt binders harden over time through both thermo-reversible and irreversible processes which, in turn, promote cracking and moisture damage in service. Oil exudation plays a significant role in accelerating both pavement distresses. Given the increasing use of oils to facilitate polymer modification and soften or rejuvenate reclaimed asphalt, a test for exudation is key to safeguarding binder quality and durability. The objective of this study was to develop a simplified, quantitative, precise and accurate test protocol. Samples from 14 northeastern Ontario pavement trial sections together with eight straight Alberta and Venezuelan binders with known superior performance were aged in a pressure aging vessel. Samples were ultrasonicated for 20 min in ethanol to accelerate exudation and tested using a dynamic shear rheometer. The ethanol was analyzed using gas chromatography-mass spectrometry to chemically identify exuded constituents. Results show that all modified binders were significantly more affected by exudation of long chain saturates compared to straight Alberta and Venezuelan binders. High amounts of polymer modifiers, such as styrene-butadiene and reactive ethylene terpolymer, as often promoted in modern-day formulations, accelerated the exudation process likely due to their destabilizing effects on colloidal binder structures. Exudation phenomena help explain the reduced lifespans for most of the modified binders in the two pavement trials.
Highlights Straight asphalt binders from Alberta and Venezuela show little to no oil exudation. Highly modified binders appear to suffer significantly from exudative hardening. Oil exudation likely causes premature cracking and moisture damage in pavements.
Development of a simple and quantitative oil exudation test for asphalt binder
Abstract Asphalt binders harden over time through both thermo-reversible and irreversible processes which, in turn, promote cracking and moisture damage in service. Oil exudation plays a significant role in accelerating both pavement distresses. Given the increasing use of oils to facilitate polymer modification and soften or rejuvenate reclaimed asphalt, a test for exudation is key to safeguarding binder quality and durability. The objective of this study was to develop a simplified, quantitative, precise and accurate test protocol. Samples from 14 northeastern Ontario pavement trial sections together with eight straight Alberta and Venezuelan binders with known superior performance were aged in a pressure aging vessel. Samples were ultrasonicated for 20 min in ethanol to accelerate exudation and tested using a dynamic shear rheometer. The ethanol was analyzed using gas chromatography-mass spectrometry to chemically identify exuded constituents. Results show that all modified binders were significantly more affected by exudation of long chain saturates compared to straight Alberta and Venezuelan binders. High amounts of polymer modifiers, such as styrene-butadiene and reactive ethylene terpolymer, as often promoted in modern-day formulations, accelerated the exudation process likely due to their destabilizing effects on colloidal binder structures. Exudation phenomena help explain the reduced lifespans for most of the modified binders in the two pavement trials.
Highlights Straight asphalt binders from Alberta and Venezuela show little to no oil exudation. Highly modified binders appear to suffer significantly from exudative hardening. Oil exudation likely causes premature cracking and moisture damage in pavements.
Development of a simple and quantitative oil exudation test for asphalt binder
Zhang, Jerron (author) / Ma, Jianmin (author) / Hesp, Simon A.M. (author)
2024-01-10
Article (Journal)
Electronic Resource
English
British Library Online Contents | 2009
| British Library Online Contents | 2015