High-Resolution Texture/Friction Dataset: Characterizing Asphalt Pavements and Aggregate Mosaics at Varied Polishing Stages for Measured Friction Analysis
Description
This database comprises high-resolution topographies of 30 distinct surface textures, derived from five different types of aggregates. Each topography is in “txt” format and is composed of 15 parallel profiles separated by 0.5 mm. Each profile has a length of 76 mm. Every two points of the profile are separated by 0.01 mm. To ensure a comprehensive assessment of surface texture, we created both asphalt and mosaic samples for each aggregate type, resulting in a total of 10 sample variations (5 asphalts + 5 mosaics). Each of the 10 samples underwent three levels of polishing, yielding three distinct states of roughness per sample and a total of 30 unique surface textures. Polishing tests were conducted using the Wehner-Schulze machine, which features two stations: one for polishing and another for measuring friction. During the polishing process, a rotary disc with three rubber cones rolled on the specimen surface, applying a designated load. To expedite the polishing, a mixture of 5% quartz powder (< 0.06mm) in 95% water was sprinkled onto the specimen. The polishing was performed on a ring, with the machine programmable to stop after a specific number of rotations. Once the specimen was polished, it was manually transferred to the friction-measuring station, equipped with a rotary disc holding three small rubber pads arranged at 120°. Each rubber pad had an average length of approximately 30 mm, a width of 15 mm, and a thickness of 4 mm, loaded at 56N (refer to Figure 3). To measure friction, the disc was launched and accelerated to a speed of 100 km/h at its circumference. At 90 km/h, water was sprayed onto the specimen surface. Upon reaching 100 km/h, the motor stopped, and the disc descended until the rubber pads made contact with the specimen surface. The rotation ceased due to the friction between the rubber pads and the specimen, and the resulting friction-speed curve was recorded. The analysis focused on the friction value at 60 km/h.
Files
Steps to reproduce
Each topography is in “txt” format and is composed of 15 parallel profiles separated by 0.5 mm. Each profile has a length of 76 mm. Every two points of the profile are separated by 0.01 mm. The friction file is an Excel file. It includes the Coefficient of Friction (CoF) values obtained from Wehner-shulz friction measurement for each of the asphalt and mosaic samples. The texture of each asphalt pavement and aggregate mosaic was captured using a laser scanning profilometer before and after 90,000 and 180,000 cycles of polishing. The measurement area is situated within the polished ring of the samples. Topography data were acquired through 15 parallel profiles, each 76 mm in length, with a sampling interval of 0.01 mm and separated by 0.5 mm intervals. The data is stored in ".txt" format and organized according to the directory structure described in the previous section. Friction data were obtained using the friction head of the Wehner-Schulz machine. To measure friction, the disc was launched and accelerated to a speed of 100 km/h at its circumference. At 90 km/h, water was sprayed onto the specimen surface. Once the speed reached 100 km/h, the motor was stopped, and the disc descended until the rubber pads made contact with the specimen surface. The rotation ceased due to the friction between the rubber pads and the specimen surface, and the resulting friction-speed curve was recorded. The friction value considered for analysis is at 60 km/h.