Analysis of triaxial test results at 40

In 1998 the Road and Railroad Research Laboratory of the Delft University of Technology and The Road and Hydraulic Engineering Division of the Ministry of Transport, Public Works and Water Management have started a joint research into rutting of asphalt concrete pavements. This research consists of both tests on full scale pavements in the LINTRACK testing facility (jointly owned by both parties) and an extensive laboratory triaxial testing program on all asphalt mixes used in the full scale tests. Purpose of this research is to investigate the potential of the triaxial test for performance specification of asphalt concrete for rutting resistance. Inspection of the triaxial test results learned that a further analysis of these data was necessary, as the scatter in the results was considerable and a consistent trend in the behaviour of the materials was not always visible. This report describes this further analysis for the data of the four different materials from the first LINTRACK test pavements, being 2 STAC (Stone Asphalt Concrete) mixes, one OAC (Open Asphalt Concrete) mix and one DAC (dense asphalt concrete) mix. All materials had been tested at 10 different stress conditions and with 5 repetitions per test condition. Although some results at 50