Xue Xue, Gao Junfeng, Wang Jiaqing, Chen Yujing
Key Laboratory of Transport Industry of Road Structure and Materials (Xi'an), Chang'an University, Xi'an 710064, China.
Xi'an Municipal Engineering Design & Research Institute Co., Ltd., Xi'an 710065, China.
Materials (Basel). 2021 Dec 22;15(1):52. doi: 10.3390/ma15010052.
This research aims to explore the high-temperature and low-temperature performances of lignin-waste engine oil-modified asphalt binder and its mixture. For this research, the lignin with two contents (4%, 6%) and waste engine oil with two contents (3%, 5%) were adopted to modify the control asphalt binder (PG 58-28). The high-temperature rheological properties of the lignin-waste engine oil-modified asphalt binder were investigated by the viscosity obtained by the Brookfield viscometer and the temperature sweep test by the dynamic shear rheometer. The low-temperature rheological property of the lignin-waste engine oil-modified asphalt binder was evaluated by the stiffness and m-value at two different temperatures (-18 °C, -12 °C) obtained by the bending beam rheometer. The high-temperature and the low-temperature performances of the lignin-waste engine oil-modified asphalt mixture were explored by the rutting test and low-temperature bending beam test. The results displayed that the rotational viscosity and rutting factor improved with the addition of lignin and decreased with the incorporation of waste engine oil. Adding the lignin into the control asphalt binder enhanced the elastic component while adding the waste engine oil lowered the elastic component of the asphalt binder. The stiffness of asphalt binder LO60 could not meet the requirement in the specification, but the waste engine oil made it reach the requirement based on the bending beam rheometer test. The waste engine oil could enhance the low-temperature performance. The dynamic stabilities of LO40- and LO60-modified asphalt mixture increased by about 9.05% and 17.41%, compared to the control mixture, respectively. The maximum tensile strain of LO45 and LO65 increased by 16.39% and 25.28% compared to that of LO40 and LO60, respectively. The high- and low-temperature performances of the lignin-waste engine oil-modified asphalt LO65 was higher than that of the control asphalt. The dynamic stability had a good linear relationship with viscosity, the rutting factor of the unaged at 58 °C, and the rutting factor of the aged at 58 °C, while the maximum tensile strain had a good linear relationship with m-value at -18 °C. This research provides a theoretical basis for the further applications of lignin-waste engine oil-modified asphalt.
本研究旨在探究木质素-废机油改性沥青结合料及其混合料的高温和低温性能。在本研究中，采用两种含量（4%、6%）的木质素和两种含量（3%、5%）的废机油对对照沥青结合料（PG 58-28）进行改性。通过布鲁克菲尔德粘度计测得的粘度以及动态剪切流变仪进行的温度扫描试验，研究了木质素-废机油改性沥青结合料的高温流变性能。通过弯曲梁流变仪在两个不同温度（-18℃、-12℃）下测得的劲度和m值，评估了木质素-废机油改性沥青结合料的低温流变性能。通过车辙试验和低温弯曲梁试验，探究了木质素-废机油改性沥青混合料的高温和低温性能。结果表明，旋转粘度和车辙因子随木质素的添加而提高，随废机油的掺入而降低。向对照沥青结合料中添加木质素增强了弹性成分，而添加废机油则降低了沥青结合料的弹性成分。沥青结合料LO60的劲度在规范中不满足要求，但根据弯曲梁流变仪试验，废机油使其达到了要求。废机油可提高低温性能。与对照混合料相比，LO40和LO60改性沥青混合料的动稳定度分别提高了约9.05%和17.41%。LO45和LO65的最大拉伸应变分别比LO40和LO60提高了16.39%和25.28%。木质素-废机油改性沥青LO65的高温和低温性能高于对照沥青。动稳定度与粘度、58℃下未老化的车辙因子以及58℃下老化的车辙因子具有良好的线性关系，而最大拉伸应变与-18℃下的m值具有良好的线性关系。本研究为木质素-废机油改性沥青的进一步应用提供了理论依据。
