生物柴油-塑料裂解蜡复合改性温拌沥青高温性能研究

High temperature performance of biodiesel-plastic cracking wax compound modified warm mix asphalt

生物柴油和废塑料的再利用对环境保护具有重要意义。为了研究生物柴油-塑料裂解蜡复合改性剂对沥青性能的影响,采用三大指标、动态剪切流变(DSR)、多应力蠕变(MSCR)和布氏旋转黏度(RV)实验,通过针入度、软化点、延度、车辙因子、弹性恢复率、不可恢复蠕变柔量和黏度等指标,评价不同配比和掺量的生物柴油和塑料裂解蜡对沥青的改性效果。结果表明,掺入生物柴油后,沥青的软化点和恢复率减小,高温性能下降。塑料裂解蜡改性后,沥青的车辙因子增大,高温性能得到提升。合适掺量的生物柴油-塑料裂解蜡复合改性沥青满足温拌标准,具有良好的高温性能。根据实验结果,掺加1.5%生物柴油+5.0%塑料裂解蜡复合改性沥青综合性能相对最佳。

The reuse of biodiesel and waste plastics is of great significance to environmental protection.In order to study the effects of the biodiesel-plastic cracking wax compound modifier on the properties of asphalt,the three major indexes,dynamic shear rheological(DSR),more stress creep(MSCR)and brinell rotary viscosity(RV)test,were used.Through the penetration,softening point,ductility,rutting factor,elastic recovery rate,irrecoverable creep compliance,and viscosityetci.ndexes,the effects of different proportion and content of biodiesel to plastic cracking wax on asphalt modification were evaluated.The results shown that the softening point and recovery rate of asphalt decreased and the high temperature performance decreased with the addition of biodiesel.After compound modification of plastic cracking wax,asphalt rutting factor increased and high temperature performance was improved.The biodieselplastic cracking wax compound modified asphalt with appropriate content met the standard of warm mixing,and had good high temperature performance.According to the test results,the composite modified asphalt with a content of 1.5%biodiesel and 5%plastic cracking wax had the best comprehensive performance.