Complex modulus of asphalt mix with calcined clay under four-point bending

In mechanistic analysis, the complex modulus is a fundamental parameter for the constitutive models of asphalt concrete. The four-point bending test, widely used in Europe, is among the most modern options for obtaining the complex modulus. In this study a four-point bending tests is carried out to obtain the dynamic modulus and phase angle of the asphalt concrete, employing Amazon representative conditions for the coarse aggregate and temperature on the road surface, which reaches almost 60 °C for many hours a day. As aggregate, taking into account the regional shortage of stone materials, we used the ASAC - Synthesized Calcined Clay Aggregate, a promising material due the abundance of raw materials and the technical and financial feasibility. As a result of the tests, it has been found the dynamic modulus and the phase angle at different frequencies and temperatures. Considering the local conditions of temperature and traffic, the dynamic module presented abrupt change, showing a drop of up to 93.3 % in value, with the surface appearing very susceptible to permanent deformation, recurring problem in local asphalt pavements.

dynamic module; the four-point bending; calcined clay aggregate; temperature.