Predicting the Skid Resistance of Concrete

This paper considers the development of wet skid resistance of concrete made with aggregates of different polished stone value. Concrete test specimens 305 x 305 x 50 mm were prepared with rock types that included Silurian greywacke, Carboniferous sandstone, Carboniferous limestone and Tertiary basalt. The concrete test specimens were not grooved. Surface texture was provided using brushing. The test specimens were subjected to simulated polishing using the Road Test Machine. Change in wet skid resistance and texture depth was measured using the pendulum test and volumetric sand patch respectively at intervals during simulated trafficking. Analysis of the data found each test specimen to lose initial surface texture within a short period of simulated trafficking. With increased trafficking the fine aggregate became exposed. Continued measurement of wet skid resistance showed each concrete slab to quickly reach equilibrium. A comparison of the found concrete data was carried out with comparable asphalt surfacing studies. The investigation concludes that a possible method exists to predict the wet skid resistance of a surfacing concrete mix