Skid Resistance Attenuation of Asphalt Pavement Based on Multifactor Accelerated Wear Test

Abstract

To describe the skid resistance attenuation of asphalt pavement during its life cycle, this paper selected a multi-variable accelerated abrasion machine to simulate the abrasion process, and British Pendulum Number was selected to evaluate the skid resistance after various abrasive cycles. During the abrasion process, three factors influencing the skid resistance were considered, including aggregate types (diorite, limestone, granite, and basalt), nominal maximum aggregate size (NMAS), and gradations (dense, gap, and open). The results show that with increasing abrasion cycles, the skid resistance of asphalt pavement firstly decreases rapidly in the first abrasion stage (0–8000 cycles), then at a relatively gentle rate in the second abrasion stage (8000–20,000 cycles), and finally at the lowest rate in the third abrasion stage (after 20,000 cycles). The skid-resistance durability and stability of pavement are ranked as basalt > granite > amphibolite > limestone. Moreover, the effect of aggregate parameters on skid resistance is in the order: angularity > PSV > WSV > CSV. The skid resistance and its stability improve as NMAS increases. The pavement skid durability is in the order: SMA > OGFC > AC. In addition, the sizes of 16 mm, 13.2 mm, 9.5 mm, 0.6 mm, 0.3 mm and 0.15 mm are the critical sieve sizes to improve the skid resistance of asphalt pavement.

Influence of Morphological Characteristics of Coarse Aggregates on Skid Resistance of Asphalt Pavement

“…This is mainly because the coarse aggregates used in SD Road are basalt, which is different from that (limestone) used in other test roads. Compared with limestone, basalt has higher roughness and wear resistance [10,23], enabling SD Road to still exhibit excellent pavement skid resistance after two years of service, even under the condition of withstanding several times the traffic volume of other test roads. Meanwhile, due to the fact that the initial skid resistance of the newly constructed asphalt pavement after operation is mainly affected by the asphalt film on the pavement surface, the modified asphalt used in SD Road has higher adhesion than the matrix asphalt used in other test roads, thus enhancing the anti-erosion and anti-stripping performance of the asphalt mixture, which has an important impact on slowing down the initial attenuation of pavement skid resistance.…”

“…Besides, using steel slag and other materials with high wear resistance as the aggregates to prepare asphalt mixtures or construct asphalt pavement can also improve the skid resistance [18][19][20]. By conducting laboratory accelerated loading tests on asphalt mixture specimens prepared with different aggregates, the results revealed that aggregates such as basalt and granite could provide excellent long-term pavement skid resistance for pavement [21][22][23]. In addition, different levels of abrasion tests on coarse aggregates have been carried out in the laboratory, and the correlation between their surface texture and the skid resistance has been analyzed [24,25].…”