Correlation between the Dynamic Modulus Obtained Mathematically and the Resilient Modulus of Laboratory of Asphalt Mixes

摘要

In the current mechanical-empirical methodology proposed by the AASHTO (American Association of State Highway Transportation Officials), the mechanical parameter used to characterize mixtures of asphalt concrete is the dynamic modulus E~*. However, traditionally, these materials are characterized by the resilient modulus Mr. That is, the engineers and the institutions that work in the area of the pavements have greater information of magnitudes of M_r measured in laboratory in comparison with E~*. Therefore, it is necessary to try to determine a simple correlation between both parameters. The mechanical-empirical methodology developed a mathematical equation for the estimation of E~*. In order to establish if it is possible to obtain a correlation between both parameters, an experimental phase was initially carried out to measure in the laboratory the M_r of mixtures of asphalt concrete, manufactured with four granulometries and three types of asphalt. Then the results obtained were compared with the mathematically calculated E~*. As a general conclusion, it is reported for the analyzed mixtures, that there is no clear correlation between the M_r obtained in the laboratory and the E~* obtained using the equation recommended by the mechanical-empirical methodology.