Acceleration Load Dynamic Response of Full scale Epoxy Asphalt Pavement under the Condition of High Temperature

Abstract:

Full scale tests of two kinds of epoxy asphalt pavement structure were carried out using MLS66 accelerated pavement test system at a test section of military airport. Considering high temperature environment, the pavement was heated to 60℃. Dynamic response characteristics was studied under the epoxy asphalt layer and asphalt concrete layer of two pavement structures. Dynamic response of epoxy asphalt layer is in the alternative state of tensile strain and compressive strain at the beginning of the loading, but is the tensile strain for semi rigid base pavement and is the compressive strain for semi rigid base pavement at middle and later periods of the loading. Asphalt concrete layers are predominantly compressive strain. Response analysis shows that mechanical behavior and state of pavement changed with the increase of loading times because of viscoelastic and rheological property of bitumen under the high temperature condition; Different mechanical response of epoxy asphalt pavement structural bring about different failure mechanism under high temperature condition, thus design control indexes are also different. Compressive strain should be controlled for composite pavement and tensile strain should be controlled for semi rigid base level.