Asphalt Treated Base (ATB) Asphalt treated base (ATB) is a dense-graded (but more permeable) HMA with a wide gradation band and lower asphalt content intended for use as a stabilizing base course and intended to be used in conjunction with a top/ wear course of...
Superpave “Superpave” is an overarching term for the results of the asphalt research portion of the 1987 – 1993 Strategic Highway Research Program (SHRP). Superpave consists of (1) an asphalt binder specification, (2) an HMA mix design method and...
Subgrade The “subgrade” is the in situ material upon which the pavement structure is placed. Although there is a tendency to look at pavement performance in terms of pavement structure and mix design alone, the subgrade can often be the overriding factor...
Loads Loads are the vehicle forces exerted on the pavement (e.g., by trucks, heavy machinery, airplanes). Since one of the primary functions of a pavement is load distribution, pavement design must account for the expected lifetime traffic loads. Loads, the vehicle...
Environment A pavement must function within its environment. The environment can vary greatly across the State at any one time and it can also vary greatly throughout time at any one place. Environmental variations can have a significant impact on pavement materials...
