From analyses of existing information on the permanent deformation characteristics of asphalt/binder-aggregate mixes, as well as the development of permanent deformation structures, it was concluded that any test to measure permanent deformation characteristics for both mix design and deformation prediction purposes should take into account the shear stresses developed within the zone, in a well-designed pavement, where significant permanent deformation could develop. This zone, in the upper 3 to 4 inches of the asphalt/binder-bound course(s), extends at least to the edges of the tires. Accordingly, a test to define the permanent deformation characteristics of asphalt/binder-aggregate mixes was developed permitting the application of representative stress states including specific levels of shear stresses which occur in the upper part of the pavement structure. (A)
Samenvatting