为了评价不同增容剂对煤直接液化残渣改性沥青低温性能的影响,首先,通过正交实验确定出三种增容剂(硅烷偶联剂、苯甲醛、二甲苯)各自的最佳掺量及掺入方式;其次,采用双边缺口拉伸(DENT)试验评价加入三种增容剂后沥青的低温抗延性断裂性...为了评价不同增容剂对煤直接液化残渣改性沥青低温性能的影响,首先,通过正交实验确定出三种增容剂(硅烷偶联剂、苯甲醛、二甲苯)各自的最佳掺量及掺入方式;其次,采用双边缺口拉伸(DENT)试验评价加入三种增容剂后沥青的低温抗延性断裂性能;最后,结合SEM照片并利用Image Pro plus图像处理软件计算加入三种增容剂后沥青中煤直接液化残渣的分散面积比,以定量地表征三种增容剂对煤直接液化残渣改性沥青低温性能的改善效果。结果表明,加入适量增容剂在一定程度上有助于煤直接液化残渣在沥青中的分散,提高两者之间的相容性,保持煤直接液化残渣改性沥青体系的长期稳定状态,避免因煤直接液化残渣的沉淀聚集而在相界面产生应力集中,增强煤直接液化残渣改性沥青的低温抗延性断裂性能。三种增容剂对煤直接液化残渣改性沥青低温性能改善效果不同,硅烷偶联剂最优,次之为苯甲醛,最差为二甲苯。展开更多
Based on the specifications of ASTM D571095 and BSI BS-3690 for Trinidad Lake Asphalt(TLA) modified asphalt,two residues(CLA1 and CLA2)from direct coal liquefaction(DCL) were evaluated for using as high grade paving a...Based on the specifications of ASTM D571095 and BSI BS-3690 for Trinidad Lake Asphalt(TLA) modified asphalt,two residues(CLA1 and CLA2)from direct coal liquefaction(DCL) were evaluated for using as high grade paving asphalt modifier.TLA was used as comparison.The results show that CLA1-and CLA2-modified asphalt with 7% of CLA1 or CLA2 addition has similar modification ability as 20% TLA-modified asphalt.The modified asphalts meet the specifications for 40～55 or 50 penetration grade.The penetration ratio of CLA2-modified asphalt after TFOT is significantly higher,which indicates its supreme ability to against the temperature aging.Preliminary study implies that DCL residues may be a suitable alternative additive for producing TLA-type modified asphalt.Furthermore it was also found that with increasing amount of CLA1 or CLA2 addition the softening point of the modified asphalts increase and the penetration value and the ductility decrease.展开更多
为了解决煤炭液化残渣在热解过程中软化熔融并剧烈膨胀导致难以利用的问题,在温度范围为30~900℃,升温速率分别为10、20、30、40℃/min的情况下,借助热重分析仪对煤直接液化残渣与褐煤进行程序升温共热解试验,采用Doyle法分析共热解动力...为了解决煤炭液化残渣在热解过程中软化熔融并剧烈膨胀导致难以利用的问题,在温度范围为30~900℃,升温速率分别为10、20、30、40℃/min的情况下,借助热重分析仪对煤直接液化残渣与褐煤进行程序升温共热解试验,采用Doyle法分析共热解动力学,将动力学结果与共热解协同作用进行关联。结果表明:共热解过程可用3个串联的一级反应描述,温度区间分别为200~310、310~470、470~900℃,其中310~470℃对应共热解反应的活泼分解阶段,反应活化能(40~50 k J/mol)远大于低、高温反应活化能(10~20 k J/mol)。液化残渣与褐煤共热解降低了活泼分解阶段的反应活化能,加快了反应速率,增大了热解失重率,使共热解反应在300~550℃表现出正协同作用。展开更多
文摘为了评价不同增容剂对煤直接液化残渣改性沥青低温性能的影响,首先,通过正交实验确定出三种增容剂(硅烷偶联剂、苯甲醛、二甲苯)各自的最佳掺量及掺入方式;其次,采用双边缺口拉伸(DENT)试验评价加入三种增容剂后沥青的低温抗延性断裂性能;最后,结合SEM照片并利用Image Pro plus图像处理软件计算加入三种增容剂后沥青中煤直接液化残渣的分散面积比,以定量地表征三种增容剂对煤直接液化残渣改性沥青低温性能的改善效果。结果表明,加入适量增容剂在一定程度上有助于煤直接液化残渣在沥青中的分散,提高两者之间的相容性,保持煤直接液化残渣改性沥青体系的长期稳定状态,避免因煤直接液化残渣的沉淀聚集而在相界面产生应力集中,增强煤直接液化残渣改性沥青的低温抗延性断裂性能。三种增容剂对煤直接液化残渣改性沥青低温性能改善效果不同,硅烷偶联剂最优,次之为苯甲醛,最差为二甲苯。
文摘Based on the specifications of ASTM D571095 and BSI BS-3690 for Trinidad Lake Asphalt(TLA) modified asphalt,two residues(CLA1 and CLA2)from direct coal liquefaction(DCL) were evaluated for using as high grade paving asphalt modifier.TLA was used as comparison.The results show that CLA1-and CLA2-modified asphalt with 7% of CLA1 or CLA2 addition has similar modification ability as 20% TLA-modified asphalt.The modified asphalts meet the specifications for 40～55 or 50 penetration grade.The penetration ratio of CLA2-modified asphalt after TFOT is significantly higher,which indicates its supreme ability to against the temperature aging.Preliminary study implies that DCL residues may be a suitable alternative additive for producing TLA-type modified asphalt.Furthermore it was also found that with increasing amount of CLA1 or CLA2 addition the softening point of the modified asphalts increase and the penetration value and the ductility decrease.
文摘为了解决煤炭液化残渣在热解过程中软化熔融并剧烈膨胀导致难以利用的问题,在温度范围为30~900℃,升温速率分别为10、20、30、40℃/min的情况下,借助热重分析仪对煤直接液化残渣与褐煤进行程序升温共热解试验,采用Doyle法分析共热解动力学,将动力学结果与共热解协同作用进行关联。结果表明:共热解过程可用3个串联的一级反应描述,温度区间分别为200~310、310~470、470~900℃,其中310~470℃对应共热解反应的活泼分解阶段,反应活化能(40~50 k J/mol)远大于低、高温反应活化能(10~20 k J/mol)。液化残渣与褐煤共热解降低了活泼分解阶段的反应活化能,加快了反应速率,增大了热解失重率,使共热解反应在300~550℃表现出正协同作用。
