ABSTRACT
Shotblasting is an advantageous pavement preservation technique aiming to improve skid resistance. Given the challenges of applying shot blating, this study assesses the impact of the moving speed of shotblasting equipment in order to optimize the technique’s outcome. For this purpose, a pilot-case study was conducted along a highway section of an in-service asphalt pavement with an antiskid layer containing steel slag. Considering a short-term period (five months), friction and macrotexture data were collected and analyzed both before and after implementation of shotblasting on the specific pavement, with the variant being the different moving speed of shotblasting equipment. The analysis results showed that immediately after the treatment as moving speed increased, the effectiveness of the shotblasting technique in improving friction and macrotexture decreased although the lower speeds resulted in intensive surface aggregate stripping. Contrariwise, that trend of the friction data could not be verified up to the end of the short-term period, presumably due to steel slag. Hence, the immediate effect of moving speed on friction cannot be considered as indicative for the short-term friction performance.
