Análise da resistência à derrapagem de revestimentos flexíveis em serviço por meio dos parâmetros IFI e SN40

Abstract

On flexible pavements, be they road or airport, one of the most important factors for the safety guarantee is the surface texture of the revetment. This surface texture consists mainly of the microtexture and macrotexture. The microtexture conditions (obtained by the British Pendulum Test method) and macrotexture (obtained by Sand Stain Test) are associated with the good adhesion and effective surface drainage of the pavement, respectively. In addition, suitable texture conditions favor safety during braking and emergency maneuvers, especially in wet lane situations. This study evaluated road safety by means of the International Friction Index (IFI) and Skid Number (SN) parameters, and verified whether the results converge for the same diagnosis. This study also evaluated whether the microtexture and macrotexture parameters have a correlation that can be described by a mathematical model. For this, 22 different revetments were analyzed, located in the Federal University of Ceará, Campus Pici. By means of the study, it was possible to verify that the 22 revetment haven’t correlation between the data of microtexture and macrotexture, and that the IFI and the SN don’t converge for the same diagnosis of the pavement, in the aspect of safety of the adhesion tire-pavement.