Abstract：The mechanical response of steel deck asphalt pavement under load provides essential reference for the improvement of pavement design methods. However, there is extremely limited research focusing on the field mechanical measurements of steel deck pavement. To be more specific, the mechanical properties of steel deck pavement under different loading temperatures are still unknown. A field test was conducted to investigate the dynamic strain responses of a kind of double-layer SMA pavement at different temperatures and loading speeds. Test results show that the mixture of the pavement is mainly subjected to compressive strain under medium and relatively low loading temperature. However, the mixture is mainly subjected to tensile strain at high loading temperature. The longitudinal strain at the bottom of the pavement alternates in compression-tension cycles while the transverse one is constantly compressive strain. The speed of loading truck has a significant influence on the strain values of the mixture. The deformation of the mixture at low loading speed is significantly larger than that at high speed. Moreover, the equivalent loading frequency of the mixture under different loading conditions is calculated based on the strain response pulse of the pavement. The research results can provide reference for determining the proper loading frequency values of some specific laboratory tests.
