Enhancing micro-surfacing asphalt with granite waste: a study on durability and performance

Micro-surfacing asphalt is a preventive maintenance method to delay asphalt pavement aging and deterioration. This study examines the use of granite powder from industrial granite waste as a filler to significantly improve micro-surfacing durability. The base filler was replaced by granite filler at 0%, 25%, 50%, 75%, and 100% by mass, with a residual bitumen content of 8.5%. Mixtures were evaluated according to International Slurry Surfacing Association–ISSA A143 guidelines. Performance tests included wet cohesion, bleeding, vertical displacement, deformation, abrasion under wet conditions, and moisture sensitivity. Results showed that 100% granite replacement increased adhesion by 6.25% at 30 min and 2.30% at 60 min, reduced displacement and deformation by 6.19%, enhanced moisture resistance by 27%, and decreased bleeding by 1.17%. Improvements are attributed to the high SiO 2 and Al 2 O 3 contents, angular particle morphology, and the large specific surface area of granite.