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Rheological and Microstructural Characterization of Steel Slag Powder-Modified Asphalt Mastics: Insights into
Xiaodong Xie1,2, Jie Gao3, Zongjie Yu1,2
1Xinjiang Academy of Transportation Sciences Co., Ltd., Urumqi 830000, China.
Abstract:
This study systematically investigates the rheological modification mechanism of steel slag powder (SSP) as an alternative filler in asphalt mastics, with comparative analysis against conventional limestone powder (LP). Four filler-to-asphalt (F/A) ratios (0.6-1.2) were employed to prepare modified mastics. Comprehensive characterization through laser diffraction analysis, BET nitrogen adsorption, and scanning electron microscopy (SEM) revealed SSP's significant microstructural advantages: a 29.2% smaller median particle size (D50) and 7.06% larger specific surface area compared to LP, accompanied by enhanced interparticle connectivity and morphological complexity. Rheological evaluation via dynamic shear rheology (DSR) demonstrated SSP's superior performance enhancement-particularly at elevated F/A ratios (1.0-1.2), where multiple stress creep recovery (MSCR) tests showed a 6.9-46.06% improvement in non-recoverable creep compliance (J) over LP-modified counterparts. The temperature sweep analysis indicated SSP's effectiveness in reducing the temperature susceptibility index by 9.37-18.06% relative to LP. Fourier-transform infrared spectroscopy (FTIR) combined with two-dimensional correlation analysis (2D-COS) confirmed the dominance of physical interactions over chemical bonding in the SSP-asphalt interface. The results establish SSP's dual functionality as both a rheological modifier and sustainable construction material, providing mechanistic insights for optimizing steel slag utilization in pavement engineering.
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