陈化钢渣集料特性和其沥青混合料性能分析  

Characterisation of Aged Steel Slag Aggregate and ItsAsphalt Mixture Performance

作　　者：张博皓 王耀正 任晓健[2] 孙佳 庄维 罗桑[1] ZHANG Bo-hao;WANG Yao-zheng;REN Xiao-jian;SUN Jia;ZHUANG Wei;LUO Sang(School of Transportation,Southeast University,Nanjing 211189,China;Jiangsu Yonggang Group Co.,Ltd.,Suzhou 215628,China;Nanjing Modern Integrated Transport Laboratory,Nanjing 211100,China)

机构地区：[1]东南大学交通学院,南京211189 [2]江苏永钢集团有限公司,苏州215628 [3]南京现代综合交通实验室,南京211100

出　　处：《科学技术与工程》2024年第30期13145-13152,共8页Science Technology and Engineering

基　　金：南京市重大科技专项(202209012);江苏省杰出青年科学基金(BK20211514);国家自然科学基金面上项目(52278445);江苏省碳达峰碳中和科技创新专项(BE2022615)。

摘　　要：为推动钢渣在道路工程中的应用,缓解钢渣堆放造成的土地占用与环境污染问题,对钢渣陈化过程中的理化特征及钢渣沥青混合料性能进行了研究。采用粒度粒形、X射线荧光光谱试验探究钢渣陈化前后的形貌特征和矿物组成。随后,利用未处理钢渣、陈化钢渣和玄武岩制备了沥青混合料,对比评价了3种沥青混合料的体积膨胀性、水稳定性、高温稳定性和低温抗裂性能。此外,通过灰色关联法分析了集料特性与混合料性能的关联性。结果表明,钢渣的高粗糙度、高棱角性使其成为玄武岩等天然集料的理想替代品。然而,未陈化钢渣体积稳定性差,遇水易膨胀,导致无法满足路面使用要求。值得注意的是,CaO和Fe 2 O 3含量是影响钢渣体积稳定性的重要因素,而陈化处理可以在一定程度上降低这些负面影响,从而改善钢渣沥青混合料的路用性能。综合各项分析,陈化钢渣沥青混合料具有较好综合路用性能,钢渣的二次利用对于实现道路基础设施的可持续发展具有重要意义。In order to promote the application of steel slag in road engineering and alleviate the problems of land occupation and environmental pollution caused by steel slag stockpiling,the physicochemical characteristics of steel slag during aging and the performance of steel slag asphalt mixtures were investigated.The morphological characteristics and mineral composition of steel slag before and after aging were investigated using particle size and shape and XRF(X-ray fluorescence spectroscopy)tests.Subsequently,asphalt mixtures were prepared using untreated steel slag,aged steel slag and basalt,and the volumetric expansion,water stability,high-temperature stability and low-temperature cracking resistance of the three asphalt mixtures were comparatively evaluated.In addition,the correlation between aggregate properties and mix performance was analysed by grey correlation method.The results show that the high roughness and angularity of steel slag make it an ideal substitute for natural aggregates such as basalt.However,the poor volume stability of unaged steel slag and its tendency to swell in contact with water resulted in its inability to meet the requirements for pavement use.It is worth noting that CaO and Fe 2 O 3 contents are important factors affecting the volumetric stability of steel slag,and aging treatment can reduce these negative effects to a certain extent,thus improving the road performance of steel slag asphalt mixtures.Comprehensive analyses,aged steel slag asphalt mixture has better comprehensive road performance,and the secondary use of steel slag is of great significance to achieve sustainable development of road infrastructure.

关 键 词：陈化钢渣 理化特性 钢渣沥青混合料 灰色关联分析 路用性能 

分 类 号：U414[交通运输工程—道路与铁道工程]