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Abstract
In order to ensure the safety of traffic, asphalt pavement is commonly required to utilize aggregates with excellent anti-abrasion property. This results in the lack of high-quality aggregates. The incorporation of solid waste in the aggregates is regarded as a high potential alternative for solving this problem. Since its material properties, such as rough surface, high Polished Stone Value (PSV) and the excellent adhesion property of asphalt, Basic Oxygen Furnace (BOF) slag can effectively improve the skid resistance of asphalt mixtures. First, the material properties of BOF slag are reviewed in this study. Then, the skid resistance of asphalt mixtures and aggregates are commendably evaluated by the Polished Stone Value test, Wehner/Schulze Tester, Aachen Polishing Machine, British Pendulum Test and Sand Patch test. The physical and mechanical properties of BOF slag play a key role in asphalt mixtures. This review found that the skid resistance mechanism of the BOF slag asphalt mixture is governed by factors such as BOF slag properties, incorporation methods and gradation types. Finally, the economic and environmental benefits of BOF slag asphalt mixtures were discussed. In addition, the function of gas catalysis and the melting of ice and snow can be added to the BOF slag asphalt mixture for a cleaner development in engineering. Furthermore, the existing problems, research directions and corresponding measures in this field are directed towards more durable and functional asphalt pavement construction.
Highlights
The skid resistance of asphalt pavement is crucial for traffic safety, and an important aspect of asphalt pavement durability [1,2,3]
Where Polished Stone Value (PSV) is the polished stone value of aggregate British Pendulum Number (BPN), S is the average value of four test specimens, BPN; C is the average value of four standard specimens, BPN
The results indicate that the steel slag contained some calcium hydroxide, and can react with asphalt to improve the adhesion between the contained some calcium hydroxide, and can react with asphalt to improve the adhesion between the steel slag and asphalt
Summary
The skid resistance of asphalt pavement is crucial for traffic safety, and an important aspect of asphalt pavement durability [1,2,3]. In order to ensure the safety of traffic, the pavement surface is generally required to utilize aggregates with excellent anti-wear and anti-abrasion properties. This requirement imposes huge pressure on the store of high-quality. Bessa et al found that the main anti-slip parameters of BOF slag, such as polished value and abrasion value, are superior to natural aggregates [14] This is related to iron and manganese ions in the steel slag. The steel slag asphalt mixtures have superior skid resistance performance compared to natural aggregates used in the surface layers [21]. It further highlighted some main challenges and considerations in order to provide guidelines for selecting the appropriate BOF slag to enhance the anti-skid of asphalt mixtures and the utilization of BOF slag
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