ABSTRACT

ABSTRACT: At the moment there are two cyclic triaxial loading systems for the testing of road construction materials under operation in the Czech Republic. Both equipments were constructed in the Road Laboratory of the Brno University of Technology, with in the frame of several research projects. The first one system is used for the evaluation of the susceptibility of asphalt mixtures to creation of permanent deformation according to the EN 12697-25. The second one is used for deriving of material characteristics of unbound and hydraulically bound base course road materials. The article evaluates and summarizes the experience with the above-mentioned testing equipments, it concentrates in detail on the influence of the applied stresses and frequencies on the test results. In the part devoted to the base course materials the evaluation is aimed at the measurement of design E-moduli and permanent deformations of recycled and secondary used materials from the building and industrial production and their use for the lower base courses. In the part dealing with the asphalt mixtures there are presented the arguments for the changes in the setup of testing conditions (particularly applied stresses) in EN 13108-20 Type testing.