Fatigue performance of titanium dioxide modified asphaltic concrete

Abstract

This study aims to investigate the physical and rheological properties of binder modified with nano-titanium dioxide and to evaluate the fatigue performance of modified asphalt mixture using Indirect Tensile Fatigue Test. Nano-titanium dioxide of 2%, 4%, 6%, 8% and 10% by weight of binder has been incorporated into unaged 80/100 binder. Through rotational viscosity test, added 10% TiO2 shows the most reduction of mixing and compaction temperature with approximately 15°C, which indicates that the viscosity was improved. Nano-TiO2 was also able to elevate the complex modulus of a binder a sides from increasing the temperature susceptibility. In terms of fatigue performance testing, addition of 10% additive does help in improving the fatigue properties as it shows greater result than the control binder. The resilient modulus of the modified mixture shows similar results to each other, which indicates it has similar property although it is compacted at lower temperature. In conclusion, modified nano-TiO2 is great in improving the physical and rheological properties of the binder asides from improving the fatigue properties.