Abstract:
The field of pavement engineering is at the verge of resource depletion and the need of
construction materials are increasing in exponential manner, it is required to check the suitability
of different alternative to replace the need of virgin materials. Suitability refers to the structural
and functional performance of the pavement towards loading and other external factors like solar
radiation, environmental and climatic factors. In order to reduce the usage of non-renewable
virgin raw materials for the construction of flexible pavement, milled material called Recycled
Asphalt Pavement (RAP) can be used. Therefore, the work analyses the effect of rejuvenators in
restoring the binder properties in a hot mix for pavement construction with RAP. Various tests
based on physical, chemical and rheological properties were done to ascertain the suitability of
binder. Rate of deterioration of binder properties due to various aging conditions like short term
(Rolling Thin Film Oven -RTFO test) and long term (recovered RAP binder) aging are
considered. Hence, rejuvenators which can be considered as modifiers of aged binder can be
blended with RAP during hot mixing to restore the binder properties. Rejuvenators such as waste
engine oil (WEO) and waste cooking oil (WCO) are adopted in the study to check the structural
and functional contribution of reusing binder. Chemical analysis includes Fourier Transform
Infrared Spectroscopy (FTIR) to find the aging indices and rheological analysis includes dynamic
Shear Rheometer to compare the complex shear modulus (G*) and phase angle (δ) for predicting
fatigue and rutting behavior. Based on the test results WCO is found effective in restoring
physical properties, in rheological properties RAP binder modified with rejuvenators are found
comparable to VG 30.
