State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.
J Hazard Mater. 2021 Jun 15;412:125344. doi: 10.1016/j.jhazmat.2021.125344. Epub 2021 Feb 6.
For the sustainable development of society, recycling of solid waste has received considerable attention worldwide. In this research, steel slag was used to replace natural aggregate in the thin asphalt overlay, and the hazardous characteristics and internal microstructure of this overlay were explored. The resistance to hydrodynamic damage of the overlay containing steel slag was also evaluated and compared with that of the traditional overlay. The results indicate that steel slag has potential leaching risk, which can lead to environmental hazards in long-term leaching processes. However, the recycling of steel slag in thin asphalt overlay inhibits the release of toxic heavy metals due to the encapsulation effect, thereby reducing the leaching concerns. Steel slag can significantly reinforce the skeleton structure and enhance the ability of the asphalt overlay to bear the load. The superior skeleton stability and moisture resistance of the steel slag asphalt overlay were observed after hydrodynamic treatment compared with overlays made of natural aggregate. The variations in the volumetric parameters and connectivity in the steel slag asphalt overlay are significantly less than those in conventional overlay after hydrodynamic treatment. This indicates that the volumetric characteristics of steel slag asphalt overlays are less affected by hydrodynamic pressure.
为了社会的可持续发展，固体废弃物的回收在世界范围内受到了相当大的关注。在这项研究中，钢渣被用于替代传统的天然骨料用于薄沥青覆盖层中，并对这种覆盖层的危险特性和内部微观结构进行了探索。还评估了含有钢渣的覆盖层对水动力破坏的抵抗力，并与传统覆盖层进行了比较。结果表明，钢渣具有潜在的浸出风险，在长期浸出过程中可能会对环境造成危害。然而，由于钢渣的包裹效应，钢渣在薄沥青覆盖层中的再利用抑制了有毒重金属的释放，从而降低了浸出的担忧。钢渣可以显著增强骨架结构，提高沥青覆盖层的承载能力。与由天然骨料制成的覆盖层相比，经过水动力处理后，钢渣沥青覆盖层的骨架稳定性和耐湿性都得到了显著提高。经过水动力处理后，钢渣沥青覆盖层的体积参数和连通性的变化明显小于传统覆盖层。这表明钢渣沥青覆盖层的体积特性受水动压力的影响较小。
