Wei Minghua, Wu Shaopeng, Xu Haiqin, Li Hechuan, Yang Chao
School of Transportation, Wuhan University of Technology, Wuhan 430070, China.
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.
Materials (Basel). 2021 Feb 11;14(4):869. doi: 10.3390/ma14040869.
Steel slag is the by-product of the steelmaking industry, the negative influences of which prompt more investigation into the recycling methods of steel slag. The purpose of this study is to characterize steel slag filler and study its feasibility of replacing limestone filler in asphalt concrete by evaluating the resistance of asphalt mastic under various aging methods. Firstly, steel slag filler, limestone filler, virgin asphalt, steel slag filler asphalt mastic and limestone filler asphalt mastic were prepared. Subsequently, particle size distribution, surface characterization and pore characterization of the fillers were evaluated. Finally, rheological property, self-healing property and chemical functional groups of the asphalt mastics with various aging methods were tested via dynamic shear rheometer and Fourier transform infrared spectrometer. The results show that there are similar particle size distributions, however, different surface characterization and pore characterization in the fillers. The analysis to asphalt mastics demonstrates how the addition of steel slag filler contributes to the resistance of asphalt mastic under the environment of acid and alkaline but is harmful under UV radiation especially. In addition, the pore structure in steel slag filler should be a potential explanation for the changing resistance of the asphalt mastics. In conclusion, steel slag filler is suggested to replace limestone filler under the environment of acid and alkaline, and environmental factor should be taken into consideration when steel slag filler is applied to replace natural fillers in asphalt mastic.
钢渣是钢铁行业的副产品，其负面影响促使人们对钢渣的回收利用方法进行更多研究。本研究的目的是对钢渣填料进行表征，并通过评估不同老化方法下沥青胶浆的性能，研究其在沥青混凝土中替代石灰石填料的可行性。首先，制备了钢渣填料、石灰石填料、原生沥青、钢渣填料沥青胶浆和石灰石填料沥青胶浆。随后，对填料的粒度分布、表面特性和孔隙特性进行了评估。最后，通过动态剪切流变仪和傅里叶变换红外光谱仪测试了不同老化方法下沥青胶浆的流变性能、自愈性能和化学官能团。结果表明，填料的粒度分布相似，但表面特性和孔隙特性不同。对沥青胶浆的分析表明，钢渣填料的添加有助于提高沥青胶浆在酸碱环境下的性能，但在紫外线辐射下尤其有害。此外，钢渣填料中的孔隙结构可能是沥青胶浆性能变化的一个潜在原因。总之，建议在酸碱环境下用钢渣填料替代石灰石填料，在将钢渣填料应用于沥青胶浆中替代天然填料时应考虑环境因素。
