Fakhri Mansour, Javadi Sajad, Sassani Alireza, Torabi-Dizaji Mohsen
Department of Civil Engineering, K. N. Toosi University of Technology, Tehran 1996715433, Iran.
Institute for Transportation, Iowa State University, Ames, IA 50010, USA.
Materials (Basel). 2022 Jan 19;15(3):736. doi: 10.3390/ma15030736.
Utilizing the self-healing properties of asphalt materials is a way to improve the service life of asphalt pavements. Enhanced self-healing capabilities can be achieved through mixture modification. Using waste or by-product materials to modify asphalt mixtures can provide further environmental benefits. However, with a given mixture modification method, the resulting materials should be adequately vetted to ensure that enhanced self-healing capability is not attained at the expense of the mixture's overall performance. This research aims to investigate the feasibility of using zinc slag filler to enhance the self-healing properties of warm mix asphalt (WMA) and evaluates the rutting susceptibility and moisture-resistance of the slag-modified mixtures. To this end, zinc slag filler was used to replace a portion of the mineral filler at different replacement rates in WMA mixtures. Self-healing capabilities of the resulting mixtures were studied under microwave induction heating. The influence of zinc slag modification on asphalt mixture's characteristics and conventional performance indicators were evaluated by the Texas boiling test, the three-point bending test, and the Kim test (a deformation test). Also, the adhesion between bitumen and aggregate was evaluated using the broken sample from the three-point bending test and digital image analysis. The results of self-healing tests demonstrated that the heat generation capability of the specimens increased with filler replacement rate, such that the specimens with 100% of the mineral filler replaced with slag showed the highest heating performance. Zinc slag filler showed the potential to improve the moisture resistance of WMA by enhancing aggregate-bitumen adhesion and thus reducing stripping. The slag-modified WMA samples exhibited better tensile strength ratio (TSR) and deformation resistance than their non-modified equivalents.
利用沥青材料的自愈合特性是提高沥青路面使用寿命的一种方法。通过混合料改性可以实现增强的自愈合能力。使用废料或副产品材料来改性沥青混合料可以带来更多的环境效益。然而，对于给定的混合料改性方法，所得材料应经过充分审查，以确保增强的自愈合能力不会以牺牲混合料的整体性能为代价。本研究旨在探讨使用锌渣填料增强温拌沥青（WMA）自愈合特性的可行性，并评估矿渣改性混合料的车辙敏感性和抗湿性。为此，在WMA混合料中，用锌渣填料以不同替代率替代部分矿质填料。在微波感应加热条件下研究了所得混合料的自愈合能力。通过德克萨斯州煮沸试验、三点弯曲试验和金氏试验（一种变形试验）评估了锌渣改性对沥青混合料特性和常规性能指标的影响。此外，使用三点弯曲试验的破碎样品和数字图像分析评估了沥青与集料之间的粘附性。自愈合试验结果表明，随着填料替代率的增加，试件的发热能力增强，以至于用矿渣替代100%矿质填料的试件表现出最高的加热性能。锌渣填料通过增强集料与沥青的粘附性从而减少剥落，显示出改善WMA抗湿性的潜力。矿渣改性的WMA样品比未改性的样品表现出更好的抗拉强度比（TSR）和抗变形能力。
