Abstract
To reduce the use of aggregates such as limestone and basalt, this paper used steel slag to replace some of the limestone aggregates in the production of SMA-13 asphalt mixes. The optimum content of steel slag in the SMA-13 asphalt mixes was investigated, and the performance of these mixes was evaluated. Five SMA-13 asphalt mixes with varying steel slag content (0%, 25%, 50%, 75%, and 100%) were designed and prepared experimentally. The high-temperature stability, low-temperature crack resistance, water stability, dynamic modulus, shear resistance, and volumetric stability of the mixes were investigated using the wheel tracking, Hamburg wheel tracking, three-point bending, freeze–thaw splitting, dynamic modulus, uniaxial penetration, and asphalt mix expansion tests. The results showed that compared to normal SMA-13 asphalt mixes, the high-temperature stability, water stability, and shear resistance of the SMA-13 asphalt mixes increased and then decreased as the steel slag content increased. All three performance indicators peaked at 75% steel slag content, and the dynamic stability, freeze–thaw splitting ratio, and uniaxial penetration strength increased by 90.48%, 7.39%, and 88.08%, respectively; however, the maximum bending tensile strain, which represents the low-temperature crack resistance of the asphalt mix, decreased by 5.98%. The dynamic modulus of the SMA-13 asphalt mixes increased with increasing steel slag content, but the volume expansion at a 75% steel slag content was 0.446% higher than at a 0% steel slag content. Based on the experimental results, the optimum content of steel slag for SMA-13 asphalt mixes was determined to be 75%.
Highlights
With the rapid development of economic globalization, the level of each industry has increased, and the consumption of steel materials in economic construction is prominent
[28], the resistance of asphalt mixture is evaluated by the by the wheel tracking test, and its dynamic stability can better reflect the ability of asphalt wheel tracking test, and its dynamic stability can better reflect the ability of asphalt pavepavement to resist rutting formation under high-temperature conditions in summer
The high-temperature rutting resistance of the Stone Mastic Asphalt (SMA)-13 asphalt mixes with steel slag contents was analyzed by the dynamic stability and rutting depth obtai the wheel tracking and Hamburg wheel tracking (HWT) tests with the incorporation of steel slag
Summary
With the rapid development of economic globalization, the level of each industry has increased, and the consumption of steel materials in economic construction is prominent. There are many irregular protrusions and tiny pores on the surface of steel slag aggregates, which cause asphalt mixes to be difficult to be compacted and have a high void ratio [23], and the pores can absorb large amounts of asphalt, resulting in increased asphalt usage [5]. Another problem is that the chemical composition of the steel slag aggregate contains substances such as free f-CaO and f-MgO that react with CO2 in the air, mainly to form CaxMg1 -xCO3. The purpose is to determine the optimum amount of steel slag for SMA-13 asphalt mixes to provide a theoretical basis for better application to road projects
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