The first part of this paper presents comparison of the characteristics of asphalt concrete AC 8 surf and AC 11 surf, with bitumen B 50/70, at low temperatures. The second part shows the results of international comparison between three laboratories in EU, who carried out the Tensile Stress Restrained Specimen Test (TSRST) and Uniaxial Tensile Strength Test (UTST) in accordance with standard EN 12697-46. In the first part are presented results of the TSRST and UTST tests as a function of the asphalt mixture characteristic (bitumen content and voids filled with bitumen – VFB) and temperature. The analysis of the results has shown that there are certain differences, especially at the higher temperatures of the test. In the second part, it is shown that there are obvious differences in the results at TSRST and UTST test between compared laboratories. Based on these findings, we believe that it would be necessary to do more extensive inter-laboratory analysis to confirm this hypothesis and that there is need to update the standard EN 12697-46 in some points.

asphalt concrete, bitumen, low temperatures, cracks