Investigate the Effect of Using Reclaimed Asphalt Pavement RAP and Polymer-Modified Bitumen on the Moisture Damage of Hot Mix Asphalt

Department of Roads and Transport Engineering, University of Al-Qadisiyah, Al-Qadisiyah, Iraq

^a* Corresponding author nourinalshabiny@gmail.com
^b Ihsan.obaid@qu.edu.iq

Abstract

Asphalt additives, in general, aim to improve the performance of asphalt mixtures by enhancing their durability and resistance to cracking and other forms of damage. Asphalt additives can be natural or synthetic, and some are biodegradable. Natural asphalt additives, such as reclaimed asphalt pavement, are much more environmentally friendly than synthetic ones. Using environmentally friendly asphalt additives can help reduce the environmental impact of the asphalt mix while enhancing its performance. This study aims to evaluate the effects of using reclaimed asphalt paving (RAP) and styrene butadiene styrene (SBS) on the performance and moisture damage of asphalt mixture, and ordinary Portland cement (OPC) was used as mineral fillers. The research includes establishing a standard reference mix for comparison and two mixtures with different quantities of reclaimed asphalt paving at percentages (15, 30, and 45%) and polymer (SBS) at 4%. The Marshall test for stability and the indirect tensile strength test were among the tests used to evaluate the mechanical properties, and the results showed that the use of reclaimed asphalt pavers and polymer-prepared bitumen led to a significant improvement in the performance of the asphalt mixture and reduced moisture damage compared to the reference mixture.