Rheological and Microstructural Characterization of Steel Slag Powder-Modified Asphalt Mastics: Insights into High-Temperature Performance Enhancement.

IF 3.1 3区材料科学 Q3 CHEMISTRY, PHYSICAL

Materials Pub Date : 2025-03-19 DOI:10.3390/ma18061357

Xiaodong Xie, Jie Gao, Zongjie Yu, Liang Song, Xuzhi Zhu

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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_nr) 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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钢渣粉改性沥青砂浆的流变学和微观结构表征：对高温性能增强的见解。

本文系统研究了钢渣粉（SSP）作为替代填料在沥青砂浆中的流变改性机理，并与常规石灰石粉（LP）进行了对比分析。采用4种填料与沥青（F/A）比（0.6-1.2）制备改性胶料。通过激光衍射分析、BET氮吸附和扫描电子显微镜（SEM）的综合表征显示，SSP具有显著的微观结构优势：与LP相比，SSP的中位粒径（D50）小29.2%，比表面积大7.06%，同时颗粒间连通性和形态复杂性增强。通过动态剪切流变学（DSR）进行的流变学评估表明，SSP具有优越的性能增强，特别是在F/A比（1.0-1.2）升高时，多重应力蠕变恢复（MSCR）测试显示，与lp改性的对应材料相比，SSP的不可恢复蠕变顺应性（Jnr）提高了6.9-46.06%。温度扫描分析表明，与LP相比，SSP有效降低了9.37 ~ 18.06%的温度敏感性指数。傅里叶变换红外光谱（FTIR）结合二维相关分析（2D-COS）证实了ssp -沥青界面中物理相互作用优于化学键。结果表明，SSP具有流变改性剂和可持续建筑材料的双重功能，为优化路面工程中钢渣的利用提供了机理见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

5.80

自引率

14.70%

发文量

7753

审稿时长

1.2 months

期刊介绍： Materials (ISSN 1996-1944) is an open access journal of related scientific research and technology development. It publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Materials provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, the properties or the functions of all kinds of materials. Chemical syntheses, chemical structures and mechanical, chemical, electronic, magnetic and optical properties and various applications will be considered.