Influence of Aggregate Grading and Macrotexture Creating With Tining Method on the Skid Resistance of Concrete Pavement

Providing adequate surface frictional resistance is a major requirement in the construction of concrete pavements, and the choice of surface finishing treatment method is an important factor that directly affects the skid resistance properties of the pavement surface. Furthermore, no widely accepted guidelines or procedures for identifying and selecting methods of texturing concrete pavements that consider relevant technical, environmental, economic, and safety issues are available. The aim of this study was to investigate the functional relationship linking macrotexture characteristics and skid resistance of concrete pavement. Therefore, requiring mixtures was designed with consideration of three different grading aggregates based on the difference in nominal maximum aggregate size (NMAS). With acceptance of these three mixtures, the study consisted of an experimental program that involved skid resistance testing of laboratory prepared specimens which textured with tining method in plastic concrete. Then the British pendulum tester and Sand patch method was used for microtexture and macrotexture measurements, respectively. Tines were raked in three different width and four different spacing and British pendulum tester experiments were performed on transverse, skew and longitudinal tined surfaces. The results demonstrated that skid resistance of concrete surface is significantly affected by the macrotexture. Moreover, this paper implies that friction value increases by increasing tine width and decreasing tine spacing. Furthermore, maximum friction was achieved when pendulum move direction was perpendicular to tine direction.