Investigation on Aging Resistance of Rubberized Bitumen Binder

摘要

The aim of this study is to investigate the effect of adding crumb tyre rubber as additive to bitumen binder properties after and before aging. In order to evaluate the durability performance of rubberized bitumen, aging tests have been conducted using short-term aging (i.e., rolling thin film oven test or RTFOT) and long-term aging (i.e., pressure aging vessel or PAV). Laboratory investigation has been conducted on asphalt binder properties using the dynamic shear rheometer test (DSR). The results showed that the use of rubberised bitumen binder reduced the aging effect on rheological properties of the bitumen binder as illustrated through an increase in stiffness shear modulus G, storage modulus G' and decrease in phase angle δ with increased crumb rubber modifier content, indicating that the crumb rubber might improve the oxidative aging resistance of rubberised bitumen binder. Additionally, the use of crumb rubber (obtained from scrap vehicles tyre) in bitumen modification is considered as a sustainable technology towards greening the infrastructure materials.