Utilization of Rice Husk Ash and Waste Engine Oil as Sustainable Modifiers for Asphalt Binder

Abstract

Improper disposal of significant quantities of waste materials, such as Rice Husk Ash (RHA) and Waste Engine Oil (WEO), poses a significant environmental risk through water and air pollution. Moreover, the limited availability of disposal space adds to the concerns surrounding their safe management. However, an alternative approach involves incorporating these waste materials as additives in asphalt binder, offering not only improved binder properties but also a means to address environmental issues. This study focuses on the modification of the binder by introducing different proportions (2%, 4%, and 6%) of Rice Husk Ash with Waste Engine Oil (2% and 4%). Through a range of tests, including conventional tests, the Bitumen Bond Strength test, Rolling Bottle test, and multiple stress creep recovery test, the modified binder specimens were evaluated for adhesion, moisture susceptibility, and elastic recovery. The experimental findings highlight that a bitumen mixture consisting of 6% Rice Husk Ash and 2% Waste Engine Oil, relative to the binder's weight, demonstrates superior adhesion, moisture susceptibility, and elastic recovery compared to the original binder. This innovative approach offers a sustainable and environmentally friendly solution for reusing Rice Husk Ash and Waste Engine Oil.