Abstract
On-site surveys on skid resistance were performed on concrete pavements of the expressways operated by NEXCO. As a result, it became clear that the decrease in skid resistance in tunnel sections is caused by the polishing action by passing vehicles' tires. It was considered that the polishing especially reduces micro-texture, while macro-texture also needs to be enlarged to keep the skid resistance higher on concrete pavement under a tunnel. It was further confirmed that the shape of macro-texture also affects skid resistance; angular-shaped positive macro-texture assures higher skid. According to the experiments on surface roughening methods for the purpose of recovering skid resistance for concrete road surface, shot-blast method was proved to be the most cost-effective by arranging bigger steel balls.
