废旧电池粉末改性沥青的微观特性及其性能

为研究废旧电池粉末改性沥青的可行性，分别将不同掺量的废旧电池粉末加入70^#沥青中，以制备废旧电池粉末改性沥青，并对比基质沥青与SBS改性沥青进行性能评价。借助X射线衍射仪（XRD）、红外光谱仪（FTIR）、扫描电镜（SEM）、原子力显微镜（AFM）等研究废旧电池粉末改性沥青的化学组成与微观结构，分析废旧电池粉末改性机理；采用三大指标、布氏黏度试验对废旧电池粉末改性沥青的常规性能指标进行测试；通过动态剪切流变仪（DSR）、多重应力蠕变（MSCR）试验评价废旧电池粉末改性沥青的流变特性；利用车辙试验（70℃）与短期老化前后的浸水马歇尔试验分析废旧电池粉末改性沥青混合料的高温稳定性及老化前后的水稳定性。研究结果表明：废旧电池粉末以C为主要成分，并含有极少量金属氧化物，其颗粒表面有较多的褶皱与凹槽；废旧电池粉末改性沥青表面存在"蜂巢"结构，且随着掺量增加，其粗糙度呈上升趋势，沥青针入度逐渐降低，软化点提升，延度略微降低，黏度逐渐增加；相同温度下，随着掺量增加，废旧电池粉末改性沥青的动态剪切模量G^*明显提高且始终高于70^#沥青，但略低于SBS改性沥青；废旧电池粉末改性沥青混合料动稳定度与残留稳定度逐渐增大；废旧电池粉末改性沥青的方式属于物理共混，该成分可使沥青的高温性能得到改善，改善程度未及SBS改性沥青，但相差幅度不大；废旧电池粉末改性沥青表面粗糙程度较大，意味着其拥有较大的比表面积，能增强沥青与集料间的黏附能力，从而提高了沥青混合料的高温稳定性与水稳定性。

Performance Study and Micro Mechanism Analysis of Waste Battery Powder Modified Asphalt

Waste battery is a kind of solid waste. In order to study the feasibility of waste battery powder modified asphalt, this paper added different amount of waste battery powder into 70^# asphalt to prepare waste battery powder modified asphalt, and compared the performance of base asphalt and SBS modified asphalt. The chemical composition and microstructure of the modified asphalt were studied by means of XRD, FTIR, SEM and AFM; Three indexes and Brookfield viscosity test were used to test the conventional performance indexes of waste battery powder modified asphalt; Dynamic Shear Rheometer (DSR) and Multiple Stress Creep Recovery (MSCR) tests were used to evaluate the rheological properties of waste battery powder modified asphalt; The rutting test (70℃) and immersion Marshall test before and after short-term aging were used to analyze the high temperature stability and water stability of waste battery powder modified asphalt mixture before and after aging. The results show that the main component of waste battery powder is C, which contains a small amount of metal oxides, and there are many folds and grooves on the surface of the particles; There is a honeycomb structure on the surface of asphalt modified by waste battery powder, and the roughness increases with the increase of the content; With the increase of asphalt content, the penetration decreases, the softening point increases, the ductility decreases slightly, and the viscosity increases; At the same temperature, the dynamic shear modulus G^* of waste battery powder modified asphalt increased significantly with the increase of dosage, and was always higher than that of 70^# asphalt, but slightly lower than that of SBS modified asphalt; With the increase of dosage, the dynamic stability and residual stability of waste battery powder modified asphalt mixture increase gradually. The results show that the asphalt modified by waste battery powder belongs to physical blending, which can improve the high temperature performance of asphalt. The improvement degree is not as good as that of SBS modified asphalt, but the difference is not significant; The surface roughness of waste battery powder modified asphalt is larger, which means that it has a larger specific surface area and can enhance the adhesion between asphalt and aggregate, thus improving the high temperature stability and water stability of asphalt mixture.