In order for the highway engineers, whether in road authorities or design firms, to implement a mechanistic-based flexible pavement design system successfully, they need to properly characterize the pavement materials in a corresponding fashion. Asphalt concrete, the primary material in flexible pavement, should be characterized using dynamic “complex” modulus E* which reflects the material’s performance as viscoelastic under traffic-simulated dynamic loading.
The dynamic modulus of asphalt concrete varies as function of materials composition and loading environment. The properties and proportioning of the component materials, asphalt bitumen and aggregates, have significant impact on the dynamic modulus. Furthermore, asphalt concrete is sensitive to temperature levels. Therefore, it is essential to measure the properties of the component materials using the recently developed modern techniques, and to measure the dynamic modulus under dynamic loading function for different conditions. These testing procedure will lead to develop the needed modulus-temperature (E*-T) relationships for various mixes that are used in Egypt.
This project is funded by the National Science Foundation under award OTH10-010-001.