印刷电路板改性沥青流变特性和微观结构的研究

The asphalt modified with different printed circuit boards(PCBs) content(0, 5%, 10%, and 15%) was prepared in this study. The general properties, rheological properties, temperature sensitivity, fatigue resistance, and morphology of the PCBs modified asphalt were investigated by conventional tests, the Brookfield viscometry tests, the dynamic shear rheometer(DSR) tests, the bending beam rheometer(BBR) tests, and the fluorescence microscopy tests. And the influence of PCBs content on the above-mentioned properties was analyzed systematically. The results showed that the addition of PCBs could improve the high temperature performance, the low temperature performance, and the temperature sensitivity property of the modified asphalt, while compromising with the fatigue resistance of the modified asphalt. With the increase of PCBs content, the modified asphalt could have better softening points, viscosity, failure temperature, and temperature sensitivity, while its low temperature performance and fatigue resistance became worse to different degree. And the particle size of PCBs became bigger and non-uniform with an increasing PCBs content. According to the above-mentioned properties, the optimum PCBs content was specified at less than 10% in the modified asphalt system.     

橡胶/SBS复合改性沥青及其混合料性能研究

首先研究分析了橡胶粉掺量对复合改性沥青高、低温性能及抗老化性能的影响,其次研究分析成型温度对SMA13混合料性能的影响;并与SBS改性沥青混合料对比分析了橡胶/SBS复合改性沥青SMA13混合料的路用性能。试验结果表明:橡胶/SBS复合改性沥青中橡胶粉的最佳掺量为15%;橡胶/SBS复合改性沥青混合料的施工温度范围为175~185℃;相较于SBS改性沥青混合料,橡胶/SBS复合改性沥青混合料的高温稳定性、低温抗裂性以及水稳定性均得到提升。