Linear Viscoelastic Properties of Bituminous Materials Including New Products Made with Ultrafine Particles

An experimental campaign has been performed at the ENTPE laboratory in order to measure the linear viscoelastic properties (shear complex modulus G*) of mastics, with a specifically developed device (annular shear rheometer). Different fillers have been used to design mastics, among which a new type of filler only composed of ultrafine particles. The use of these ultrafine particles induces a significant increase in the complex modulus of mastics at high temperature in comparison to mastics with classical fillers. The potential for reinforcement of fillers is quantified by the complex reinforcement coefficient R-M* introduced in this paper. The ultrafine particles have also been used in bituminous mixtures. As it is observed for mastics, an important increase of the modulus is observed at high temperature for the mixtures made with ultrafine filler. Finally, simulations of the linear viscoelastic behaviour of bituminous materials with 2S2P1D model developed at the ENTPE are proposed. Simulations fit quite well experimental results.