In recent decades,modified asphalt materials have been used in enhancing the traffic load on the roads.The main objective of this paper is to explore the modifi cation effect of direct coal liquefaction residue(DCLR)o...In recent decades,modified asphalt materials have been used in enhancing the traffic load on the roads.The main objective of this paper is to explore the modifi cation effect of direct coal liquefaction residue(DCLR)on as-phalt binders and investigate the effectiveness of DCLR in improving the performance of asphalt road.This paper prepared modifi ed petroleum as-phalt under diff erent process conditions and tested its penetration,softening point and ductility index.Based on the experimental data,according to gray correlation degree,the performance for the asphalt was compared.The performance for the modified asphalt is simulated and predicted using poly-nomial functions.The modifi ed asphalt was analyzed by FT-IR,TGA,SEM and HPLC.The results show that the optimal process conditions for DCLR modifi ed asphalt are shear mixing time of 45 min,shear mixing tempera-ture of 150℃ and shear mixing rate of 4000 r/min.The predicted fit with the experimental data of 0.993 further demonstrates the effectiveness of the method.The characterization results show no significant chemical change between the DCLR and the asphalt.DCLR can significantly improve the high temperature performance and water stability of the asphalt,but it has little impact on its low temperature performance.展开更多
为研究煤直接液化残渣(DCLR)改性沥青路面的抗车辙性能,基于京新(北京—乌鲁木齐)高速公路的交通环境调查数据,以车辙深度和动稳定度为指标,采用ABAQUS模拟和沥青路面结构分析软件(APAD)计算2种方法,分别对作为中面层的4种沥青混合料(D...为研究煤直接液化残渣(DCLR)改性沥青路面的抗车辙性能,基于京新(北京—乌鲁木齐)高速公路的交通环境调查数据,以车辙深度和动稳定度为指标,采用ABAQUS模拟和沥青路面结构分析软件(APAD)计算2种方法,分别对作为中面层的4种沥青混合料(DCLR改性沥青混合料、复合DCLR改性沥青混合料、SK-90沥青混合料和SBS改性沥青混合料)在同一路面结构(4 cm AC-13上面层、6 cm AC-20中面层、8 cm AC-25下面层、40 cm水泥稳定碎石基层和20 cm石灰土底基层)和不同使用年限(1、2、5、10、15年)下进行车辙预估,并通过室内车辙试验和统计学检验方法进行性能验证和模拟结果评价。结果表明:理论预测值与实际测试结果基本一致,在显著性水平取0.05时,2种车辙深度模拟计算方法不存在系统误差,即车辙预估具有一致性;4种沥青路面结构的车辙深度均随使用年限的增加呈线性增长,判定系数R2均在0.9以上,其中复合DCLR改性沥青路面车辙增长速率最慢,DCLR改性沥青路面次之,第3为SBS改性沥青路面,最差为SK-90沥青路面;在设计年限15年内,与常规的SK-90和SBS改性沥青路面相比,DCLR和复合DCLR改性沥青路面分别减少了40%~60%和30%~50%的车辙,抗变形能力分别提高了1.7~2.4倍和1.4~2.0倍;复合DCLR改性沥青路面抗车辙性能最为优异,DCLR改性沥青路面强于SBS改性沥青路面,SK-90沥青路面抗车辙性能最差。展开更多
The compatibility between direct coal liquefaction residue(DCLR) and five kinds of pure bitumen(Shell-90,SK-90, ZSY-70, DM-70 and KLMY-50) was evaluated in this study. The rheological characteristics, glass transition...The compatibility between direct coal liquefaction residue(DCLR) and five kinds of pure bitumen(Shell-90,SK-90, ZSY-70, DM-70 and KLMY-50) was evaluated in this study. The rheological characteristics, glass transition temperatures(T_g), solubility parameters(SP) and SARA(saturates, aromatics, resins, and asphaltenes) fractions of DCLR,five kinds of pure bitumen and their blends(named as DCLR modified bitumen) were measured using the dynamic shear rheometer(DSR), differential scanning calorimetry(DSC), viscosity, and SARA tests, respectively. And the compatibility between DCLR and pure bitumen was characterized with three approaches, viz. the Cole-Cole plot,T_g, and the solubility parameter difference(SPD) method. Since each method has its own working mechanism, the compatibility ranking for the DCLR and five kinds of pure bitumen is slightly different according to the three approaches. However, the difference is pretty close and sometimes can be ignored. The general compatibility ranking decreases in the following order: Shell-90≈SK-90>DM-70≈ZSY-70>KLMY-50, which is affected by the asphaltenes content and the colloid index(I_c) value in the pure bitumen. Pure bitumen with lower asphaltenes content and colloid index(I_c) value has better compatibility with DCLR.展开更多
文摘In recent decades,modified asphalt materials have been used in enhancing the traffic load on the roads.The main objective of this paper is to explore the modifi cation effect of direct coal liquefaction residue(DCLR)on as-phalt binders and investigate the effectiveness of DCLR in improving the performance of asphalt road.This paper prepared modifi ed petroleum as-phalt under diff erent process conditions and tested its penetration,softening point and ductility index.Based on the experimental data,according to gray correlation degree,the performance for the asphalt was compared.The performance for the modified asphalt is simulated and predicted using poly-nomial functions.The modifi ed asphalt was analyzed by FT-IR,TGA,SEM and HPLC.The results show that the optimal process conditions for DCLR modifi ed asphalt are shear mixing time of 45 min,shear mixing tempera-ture of 150℃ and shear mixing rate of 4000 r/min.The predicted fit with the experimental data of 0.993 further demonstrates the effectiveness of the method.The characterization results show no significant chemical change between the DCLR and the asphalt.DCLR can significantly improve the high temperature performance and water stability of the asphalt,but it has little impact on its low temperature performance.
文摘为研究煤直接液化残渣(DCLR)改性沥青路面的抗车辙性能,基于京新(北京—乌鲁木齐)高速公路的交通环境调查数据,以车辙深度和动稳定度为指标,采用ABAQUS模拟和沥青路面结构分析软件(APAD)计算2种方法,分别对作为中面层的4种沥青混合料(DCLR改性沥青混合料、复合DCLR改性沥青混合料、SK-90沥青混合料和SBS改性沥青混合料)在同一路面结构(4 cm AC-13上面层、6 cm AC-20中面层、8 cm AC-25下面层、40 cm水泥稳定碎石基层和20 cm石灰土底基层)和不同使用年限(1、2、5、10、15年)下进行车辙预估,并通过室内车辙试验和统计学检验方法进行性能验证和模拟结果评价。结果表明:理论预测值与实际测试结果基本一致,在显著性水平取0.05时,2种车辙深度模拟计算方法不存在系统误差,即车辙预估具有一致性;4种沥青路面结构的车辙深度均随使用年限的增加呈线性增长,判定系数R2均在0.9以上,其中复合DCLR改性沥青路面车辙增长速率最慢,DCLR改性沥青路面次之,第3为SBS改性沥青路面,最差为SK-90沥青路面;在设计年限15年内,与常规的SK-90和SBS改性沥青路面相比,DCLR和复合DCLR改性沥青路面分别减少了40%~60%和30%~50%的车辙,抗变形能力分别提高了1.7~2.4倍和1.4~2.0倍;复合DCLR改性沥青路面抗车辙性能最为优异,DCLR改性沥青路面强于SBS改性沥青路面,SK-90沥青路面抗车辙性能最差。
基金sponsored by the National Natural Science Foundation of China (51478028 and 51778038)the Program for Changjiang Scholars and Innovative Research Team in Universities(IRT-17R06)
文摘The compatibility between direct coal liquefaction residue(DCLR) and five kinds of pure bitumen(Shell-90,SK-90, ZSY-70, DM-70 and KLMY-50) was evaluated in this study. The rheological characteristics, glass transition temperatures(T_g), solubility parameters(SP) and SARA(saturates, aromatics, resins, and asphaltenes) fractions of DCLR,five kinds of pure bitumen and their blends(named as DCLR modified bitumen) were measured using the dynamic shear rheometer(DSR), differential scanning calorimetry(DSC), viscosity, and SARA tests, respectively. And the compatibility between DCLR and pure bitumen was characterized with three approaches, viz. the Cole-Cole plot,T_g, and the solubility parameter difference(SPD) method. Since each method has its own working mechanism, the compatibility ranking for the DCLR and five kinds of pure bitumen is slightly different according to the three approaches. However, the difference is pretty close and sometimes can be ignored. The general compatibility ranking decreases in the following order: Shell-90≈SK-90>DM-70≈ZSY-70>KLMY-50, which is affected by the asphaltenes content and the colloid index(I_c) value in the pure bitumen. Pure bitumen with lower asphaltenes content and colloid index(I_c) value has better compatibility with DCLR.
