The thin film oven test and the rolling thin film oven test are widely used to simulate the asphalt hardening that occurs in hot-mixplants. Using nine road-collected hot-mix samples and the corresponding tank asphalts, a comparison is made between the oven tests and the hot mix. Comparisons are made on the basis of viscosity at 60 deg c and 135 deg c, penetration at 25 deg c, infrared analysis, and gel permeation chromatography. In general, the two oven tests are in close agreement for all parameters at standard test times. However, if the times are extended, they may diverge. The recovered hot-mix asphalt is generally more aged than the oven-aged material with respect to all parameters although less so with viscosity. The infrared spectra show much greater change in the hot-mix than in the oven-agedmaterial. The hot-mix operation also produces highly oxidized material that is not usually removed from the aggregate in the extractionoperation. This paper appears in transportation research record no.1323, Asphalt mix materials 1991
Abstract