Evaluation of Self-Healing Performance of the Hot Mix Asphalt Using Metallic Wool and Recycled Materials

Abdelghani Mahmoud, Ahmed; Fouad, Mahmoud; E. A. Mostafa, Abdelzaher

doi:10.21608/erj.2022.258131

Evaluation of Self-Healing Performance of the Hot Mix Asphalt Using Metallic Wool and Recycled Materials

Document Type : Original Article

Authors

¹ Assistant. Professor of Highways and Traffic Engineering, Civil Engineering Department, Mattaria Faculty of Engineering, Helwan University,

² Researcher at Mattaria Faculty of Engineering, Helwan University

³ Professor of Highways and Traffic Engineering, Civil Engineering Department, Mattaria Faculty of Engineering, Helwan University

10.21608/erj.2022.258131

Abstract

It is obvious that, the type of fillers has significant effects on the properties of hot-mix asphalt (HMA). It is very important to understand the effect of these types of fillers on the HMA and its performance. Therefore, this paper examines the effect of different types of recycled fillers on the properties of HMA mixture. Four types of filler and three filler percentages for each one was used to evaluate the characteristics of HMA and to characterize the effect of filler in HMA. The properties of HMA evaluated include Marshall Test, indirect tensile strength (ITS) and tensile strength ratio (TSR). The research results found that fillers had a great influence on the properties of HMA. Also, this study investigates the effect of using Metallic wool on the tensile strength of the HMA. To achieve this goal, Metallic wool was added at 0.5% and 0.75% from the total mix weight. To simulate the HMA cracks, the specimens were prepared using metallic wool. Then, subjected to ITS load. After cracking the specimens, it was left for 24 hours; then subjected to heat with different temperature (60, 90, 115). Finally, the specimens were subjected to the ITS load again. The results showed that addition of metallic wool can significantly improve the self-healing behavior of HMA.

Keywords