ABSTRACT
As a new pavement material, Poly(methyl methacrylate) mastic has a promising application role in sensitive surface layers. In order to better understand the design, function and the utilization of PMMA mastic with carbon nanotubes in sensitive surface layers, an improved micromechanics model of electrical conductivity considering the effect of aggregate fillers is developed in this paper. Results show that the predicted conductivity of PMMA mastic containing CNTs fits well with the test results. The error is less than 1% when the fillers content is one and three times of the PMMA. Moreover, the increase of the effective volume fraction of CNTs and the block effect of aggregate fillers function at the same time, then contribute to the overall conductivity of the composite. The improved micromechanics model can be used to analyze mechanical-electrical constitutive relation more accurately and further guide the application of conductive and piezoresistive surface materials.
