Effect of Water Film Thickness on skid Resistance of Tined Concrete Pavement

Abstract

Wet pavement friction decreases with increased water film thickness (WFT), significantly raising the risk of vehicle crashes. The British Pendulum Test is used to measure wet pavement friction for design and management. The British Pendulum Number (BPN) in wet conditions varies with WFT. Following ASTM E303-93 standard procedures, WFT was simulated by spraying water on the pavement surface. However, the measurement of BPN did not include specific information about the thickness of the water film present during testing. To address these issues, WFTs and BPNs were measured using a rainfall simulator across various intensities, drainage lengths, slopes, and textures. This study examines WFT's impact on BPN for wet friction and determines WFT for each BPN on various surfaces. This study shows significant BPN decreases with increasing WFT for non-tined and 25mm tined surfaces, while 16mm tined surfaces decrease slightly. These insights improve friction values, enhancing road safety, better design, and reducing crash risks.