Modelling and experimental investigation on mixing technique of graphite modified conductive asphalt mixture

Abstract

Conductive asphalt mixture should have excellent pavement performance as well as electrical conductivity. For this purpose, this paper established a mathematical model to analyse the coating process on graphite particles with different sizes by asphalt film during the mixing process. To ensure an appreciable uniformity, the optimum mixing time of graphite modified conductive asphalt mixture was determined. The results show that the thickness of asphalt film coated on graphite particles depends on the mixing time as well as the particle size. Smaller graphite particles are more easily attached to asphalt than aggregates. The mixing uniformity is strongly dependent on the structural parameters, operating parameters, and the using parameter of the mixer. For the mixer with a speed 45 rev min⁻¹, it is recommended to blend the aggregate and asphalt before and after adding graphite powder for 9 and 30 s respectively, in the common mixer material filling rate.

Keywords:

• Conductive asphalt mixture
• Mixing technique
• Graphite powder
• Mathematical model

Acknowledgements

This study was financially supported by the National Science & Technology Pillar Program during the Twelfth Five-year Plan Period (project no. 2011BAE28B03).