Performance Evaluation of GTR modified and Control Asphalt Mixtures using cantabro Test

Abstract: This study looks at the possibility of improving the properties of asphalt binders through the use of Ground Tire Rubber (GTR) with the two aspects of sustainability and durability in focus. The asphalt binders utilized were processed and compared to control samples that did not have any GTR. To be specific, their interest centers on PG 76-22 which is modified with GTR 5% and PG 64-22 which contains 15% GTR, with their unmodified counterparts. The effects of aging on the performance of the binders were determined by analyzing both unaged (zero-hour) and 5-day aged samples.

The cantabro test stresses different aspects of an asphalt mixture’s performance namely ability to sustain wear and resistance to disintegration by imparting various but controlled levels of stress, four stress levels (40, 60, 100 and 300 Revolutions) are achievable. In this regard, this test provides quantitative assessment of asphalt modifying effectiveness in terms of deformation and the extent of GTR compromise on the material’s wear-resisting properties. Seeing that most of the previous researches highlighted the limitations of GTR, this research reinforces GTR’s potential to extend the pavement exploratory life while curbing the environmental effects from tire disposal by recycling it. All in all the present research contributes to the advancement of pavement engineering discipline by highlighting the practical and environmental opportunities brought about by the use of recycled materials such as GTR in Pavement construction.

Keywords: Ground Tire Rubber , Modified Asphalt Mixtures,
Control Mixture, Asphalt Modification, Durability