Enhancing Mechanical and Electrical Properties of Hot Mix Asphalt Using Self-Sensing Technology and Graphite Powder

Abstract

The present study will design self-sensing asphalt mixtures that can detect the applied load; thus, it gives a lead toward more sustainable infrastructure by means of real-time pavement monitoring, hence optimized maintenance with less environmental impact. These are points which scientists have been trying to enhance in the mixes of asphalt concrete from in terms of the mechanical properties; though traditionally, monitoring asphalt surfaces was highly expensive and inaccurate. These monitoring systems provide useful data related to pavement condition assessment, design, and cost estimation for the execution of the maintenance programs. Recent development in technologies, especially the self-sensing technology, has provided new avenues toward improving asphalt mixtures. The purpose of this research is to incorporate conductive materials into hot mix asphalt for enhancing the electrical and mechanical properties, aiming at developing an electrically conductive mixture able to perform self-sensing of the applied loads. The experimental work included the Marshall tests with 40-50 penetration-grade asphalt and aggregate mixtures prepared according to the Iraqi specifications. Graphite powder was added to the asphalt blend as a filler in order to investigate its effect on the performance of the asphalt blend. Electrical resistance changed significantly because the mixture was sensitive to the applied load. Besides, the stability of modified asphalt was increased according to the Marshall test. Indeed, these have improved the watched conditions of the pavement with enhanced operational efficiency and service life.