Effects of waste ceramic dust and butyl rubber on rheological properties of asphalt binder

Abstract

This study was carried out using different methods to assess the contribution of asphalt mastic to the performance of a pavement at high temperature in rut resistance when waste ceramic and butyl rubber powders blended within the bitumen. In this research bitumen 80/100 modified at different percentages (0%, 1%, 2%, and 3%) of Ceramic-Butyl Rubber (CBR) by weight of neat bitumen were studied. Firstly, the asphalt mastic samples were prepared by mixing in a laboratory at an average temperature of 180°C for about 60 minutes with mixer operated at 800rpm. Next, in this regard, a different experimental program such as conventional tests and super pave tests were conducted. The conventional test results show that modified bitumen has decreased penetration value, increased softening point and lower ductility value. This indicates that, with the addition of CBR modifiers, the softness of the bitumen drops seriously. Additionally, the complex modulus of master curves results illustrates that the addition of CBR modifiers can enhance the rutting resistance of softer binder at high temperature and low frequency. Moreover, the rutting parameter G∗/sin ( ) results were increased from PG 64°C to 70°C with increasing of CBR from 2% to 3% respectively, while they are declined significantly with increased temperatures. This improvement shows that CBRs modified bitumen may be suitable for using in hot climates to develop stiff flexible asphalt mixtures. Finally, the MSCR test results illustrates that the CBR dramatically increases the resistance of bitumen to rutting by reducing the Jnr and increasing the recovery percent of bitumen.