Abstract
Steel slag is a main form of solid waste. Using this component to replace part of the aggregate in an asphalt mixture is an effectively way of treating solid waste. To study the performance degradation of asphalt mixture with various content of steel slag under heavy loading, some large-sized basalt hot mixed asphalt mixture (BHMA) and steel slag hot mixed asphalt mixture (SHMA) in a form of specimens were prepared and a heavy loading wheel tracking test was conducted. The aggregate characteristics of basalt and steel slag were measured. The deformation and skid resistance of the asphalt mixture with different content of steel slag was tested and analyzed. Due to the particle characteristics of steel slag aggregate, it was found that a low content of steel slag can effectively improve the resistance to deformation and skid resistance of the asphalt mixture under heavy loading. The response of SHMA can still meet the pavement technical requirement after long-term heavy loading service. The main change in the mixture under heavy loading is the crushing of the 9.5–16 mm aggregate, and the content of this part also significantly affects the deformation. This study explains the mechanism of degradation of SHMA under heavy loading: the large aggregate is crushed and forms a new aggregate skeleton structure.
Highlights
In recent years, the ever-developing transportation and construction industry has required a massive quantity of aggregates
The basalt fine aggregate was selected for both slag hot mixed asphalt mixture (SHMA) and basalt hot mixed asphalt mixture (BHMA)
A high steel slag content reduces the asphalt that acts as a binder, resulting in the loss in strength of the asphalt mixture
Summary
The ever-developing transportation and construction industry has required a massive quantity of aggregates. As an industrial by-product generated from steel tailing waste, with the development of steel manufacture, an overabundant amount of steel slag has become a threat to the environment in recent years One solution to this problem is recycling and utilization of steel slag in road construction. Xie researched the recycling of basic oxygen furnace (BOF) slag in asphalt mixtures They found that the addition of BOF could significantly improve the mechanical strength and moisture damage resistance [12,13,14]. This study proposes an explanation for the mechanism of performance degradation of SHMA under heavy loading. Those analysis results will provide significant information for decision-makers to increase available aggregates and the utilization of industrial by-products. The basic properties of steel slag coarse aggregate and natural basalt coarse aggregate were tested according to GB/T 24765–2009 [24] and JTG E42–2005 [25] and shown in Tables 2 and 3
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
