EFFECT OF OXIDATION ON RHEOLOGICAL PROPERTIES OF ASPHALT BINDERS
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Understanding the oxidation pathway of asphalt and its effect on its chemical, physical and rheological properties cannot be overemphasized. In sustaining and ensuring long-lasting asphalt pavements in road constructions, the mechanism of oxidation needs to be known so as to reduce its rate of oxidation during its service life. Asphalts behave differently due to their difference in chemical composition which differ from one source to another. A common observation in the oxidation of asphalt is the production of carbonyl group. Unfortunately, no tangible reaction mechanism of asphalt is known due to its complex structure. The effect of oxidation on the rheological properties of asphalt was studied under this research. Asphalt binders of different sources and different physical properties were obtained for this work and studies. Also, the thickness was varied for the pressure aged binders at 20 hours. Service life aging was simulated using the Pressure Aging Vessel (PAV) and the extent of oxidation before and after aging were considered using the Fourier Transform Infrared Spectrometer (FTIR). Rheological properties before and after aging were also carried out using the Dynamic Shear Rheometer (DSR) while the Fraass Breaking Point (FBP) instrument was used to simulate the fatigue resistance in asphalt binders by determining the temperature at which cracks initiate. An increase in the carbonyl index of the binders were noticed with increase in aging hours. Also, the stiffness of the binders increased with a decrease in the phase angle as aging took place. Differences in rheological properties were noticed with different sources. It was also observed that the binder thickness of 1 mm of pressure aged binders at 20 hours showed close characteristics with that of 3.2 mm aged at 40 hours.
URI for this recordhttp://hdl.handle.net/1974/28766
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