Several civilian vehicles in China operate in urban traffic conditions and have their motor oil changed every 5,000 km.This study investigates the variations in oil properties after servicing at 5,000 km,based on syst...Several civilian vehicles in China operate in urban traffic conditions and have their motor oil changed every 5,000 km.This study investigates the variations in oil properties after servicing at 5,000 km,based on systematic road tests(including a repeated test,a parallel test,and a new vehicle test).The physicochemical properties,changes in components,oxidation stability,detergent‐dispersant performance,and tribological properties of motor oils were analyzed.The results showed that the total acid number(TAN)of oils increased with the operation mileage,by up to 1.41 mgKOH/g.The total base number(TBN)decreased after the road tests were completed,and the decrease was less than 44.6%.The kinematic viscosity(KV)of most oils decreased initially and then stabilized in the middle stage,before starting to increase later in the experiment.The change in KV at 100℃was less than 15.96%.The oxidation onset temperature(OOT)of the oils diminished gradually with the operation mileage.All OOT values of the used oils were higher than 210℃.A spot test indicated that the used oils retained their detergentdispersant performance to an appropriate extent.The four‐ball wear scar diameters and friction coefficient of the used oils did not increase significantly after the road tests were completed.This study can serve as a reference for end‐users when changing motor oils.展开更多
随着市政道路服役年限增长,路面易出现龟裂、沉陷、车辙等结构性病害,传统维修方式存在旧料利用率低、施工周期长等问题。某市政道路改建工程全长2.1 km,原路面为“4 cm AC-13C+6 cm AC-16C+14 cm二灰碎石基层+30 cm石灰土底基层”结构...随着市政道路服役年限增长,路面易出现龟裂、沉陷、车辙等结构性病害,传统维修方式存在旧料利用率低、施工周期长等问题。某市政道路改建工程全长2.1 km,原路面为“4 cm AC-13C+6 cm AC-16C+14 cm二灰碎石基层+30 cm石灰土底基层”结构,因长期承载出现纵横向裂缝及交叉口车辙变形,亟需通过再生技术恢复路用性能。泡沫沥青冷再生工艺具有旧料就地利用、节能减排及施工效率高等优势,本研究以该工程为依托,通过优化铣刨参数、配合比设计及施工控制流程,将原路面铣刨料再生为8 cm冷再生基层,并加铺4 cm改性沥青混凝土面层,重点分析施工技术要点与实施效果,为同类工程提供实践依据。展开更多
基金The authors are grateful for the financial support from the National Natural Science Foundation of China(51575402)the National Natural Science Foundation of Hunan Province of China(No.2020JJ5217).
文摘Several civilian vehicles in China operate in urban traffic conditions and have their motor oil changed every 5,000 km.This study investigates the variations in oil properties after servicing at 5,000 km,based on systematic road tests(including a repeated test,a parallel test,and a new vehicle test).The physicochemical properties,changes in components,oxidation stability,detergent‐dispersant performance,and tribological properties of motor oils were analyzed.The results showed that the total acid number(TAN)of oils increased with the operation mileage,by up to 1.41 mgKOH/g.The total base number(TBN)decreased after the road tests were completed,and the decrease was less than 44.6%.The kinematic viscosity(KV)of most oils decreased initially and then stabilized in the middle stage,before starting to increase later in the experiment.The change in KV at 100℃was less than 15.96%.The oxidation onset temperature(OOT)of the oils diminished gradually with the operation mileage.All OOT values of the used oils were higher than 210℃.A spot test indicated that the used oils retained their detergentdispersant performance to an appropriate extent.The four‐ball wear scar diameters and friction coefficient of the used oils did not increase significantly after the road tests were completed.This study can serve as a reference for end‐users when changing motor oils.
文摘随着市政道路服役年限增长,路面易出现龟裂、沉陷、车辙等结构性病害,传统维修方式存在旧料利用率低、施工周期长等问题。某市政道路改建工程全长2.1 km,原路面为“4 cm AC-13C+6 cm AC-16C+14 cm二灰碎石基层+30 cm石灰土底基层”结构,因长期承载出现纵横向裂缝及交叉口车辙变形,亟需通过再生技术恢复路用性能。泡沫沥青冷再生工艺具有旧料就地利用、节能减排及施工效率高等优势,本研究以该工程为依托,通过优化铣刨参数、配合比设计及施工控制流程,将原路面铣刨料再生为8 cm冷再生基层,并加铺4 cm改性沥青混凝土面层,重点分析施工技术要点与实施效果,为同类工程提供实践依据。
