Research data on pavement texture changes for D6.5

In-situ surface texture measurements

Three different tests were conducted to monitor the evolution in the NEMO micro-texture of the carousel pavements (S1-S4): British pendulum (SRT), Dynamic Friction Tester (DFT) and T2GO. Measurements were taken at three different locations per section in the initial state and at increasing numbers of cycles : 0, 20,000, 50,000, 100,000, 200,000, 500,000, 750,000 and 1 million  load cycles. 

The macrotexture of NEMO pavements was evaluated using two complementary techniques. The first is a classical volumetric techniques called the sand patch test. According to this techniques, the macrotexture is approached by mean texture depth (MTD). The second technique relies on the profilometry according to ISO EN 13473-1 standard. Two devices named Elatextur and LTS9500 measure the depth of surface roughness using a laser beam.  The Elatextur laser scan has a width 400 mm diameter and a 0.2 mm of path while the LTS9500 scans a 4″ x 4″ area with a lateral resolution of less than 0.5 mm