In order to study the anti-fatigue performance of RCA modified asphalt (RMA),the performance of RMA and 90#matrix asphalt with different modifier content were measured by asphalt penetration,ductility,softening point,...In order to study the anti-fatigue performance of RCA modified asphalt (RMA),the performance of RMA and 90#matrix asphalt with different modifier content were measured by asphalt penetration,ductility,softening point,Brookfield viscosity,rheological index,infrared spectrum and dielectric constant test.This paper discusses the changes of asphalt basic indexes,fatigue properties and asphalt components based on dielectric properties under different modifier contents,and analyzes the grey correlation degree between components and asphalt pavement performance indexes.The results show that the optimum content of RCA modifier is 16.7%of the asphalt quality according to the penetration,ductility,softening point,Brockfield viscosity,viscosity temperature curve and fatigue life.In the phase angle-strain curve,there is disorder in the latter part of the curve.According to the strain (ε_(d)) corresponding to the disorder point,a new fatigue failure criterion is proposed and proved.Based on the new asphalt fatigue failure criterion,the fatigue prediction model of asphalt mixture is improved,and the fatigue life predicted by the improved fatigue model is compared with the fatigue life obtained by four-point bending fatigue test.The results show that the proposed new asphalt fatigue failure criterion is reasonable,and the fatigue life predicted by the improved asphalt mixture fatigue prediction model is accurate.The research method of classifying asphalt components based on dielectric properties is simple and effective,and the components have a high correlation with the road performance of base asphalt and modified asphalt.展开更多
目的探讨先期近端优化技术(POT)能否常规应用于各种分叉病变双支架术.方法选择我院近3年接受双支架治疗的分叉病变患者386例,根据是否采用先期POT,分为先期POT组178例[先期POT结合常规对吻球囊扩张(KBI)]和KBI组208例.观察2组1年不良心...目的探讨先期近端优化技术(POT)能否常规应用于各种分叉病变双支架术.方法选择我院近3年接受双支架治疗的分叉病变患者386例,根据是否采用先期POT,分为先期POT组178例[先期POT结合常规对吻球囊扩张(KBI)]和KBI组208例.观察2组1年不良心血管事件、KBI成功率及效率.结果在随访期内,先期POT组不良心血管事件发生率(11.2% vs 19.7%,P=0.03)和再次靶血管重建率低于KBI组(7.3% vs 13.9%,P=0.04),KBI成功率明显高于KBI组(98.3%vs88.5%,P=0.00).结论先期POT结合KBI,能提高KBI成功率及操作效率,使双支架术治疗分叉病变获得更佳临床预后.展开更多
基金Funded by Natural Science Foundation of Inner Mongolia,China (No. 2019MS05033)。
文摘In order to study the anti-fatigue performance of RCA modified asphalt (RMA),the performance of RMA and 90#matrix asphalt with different modifier content were measured by asphalt penetration,ductility,softening point,Brookfield viscosity,rheological index,infrared spectrum and dielectric constant test.This paper discusses the changes of asphalt basic indexes,fatigue properties and asphalt components based on dielectric properties under different modifier contents,and analyzes the grey correlation degree between components and asphalt pavement performance indexes.The results show that the optimum content of RCA modifier is 16.7%of the asphalt quality according to the penetration,ductility,softening point,Brockfield viscosity,viscosity temperature curve and fatigue life.In the phase angle-strain curve,there is disorder in the latter part of the curve.According to the strain (ε_(d)) corresponding to the disorder point,a new fatigue failure criterion is proposed and proved.Based on the new asphalt fatigue failure criterion,the fatigue prediction model of asphalt mixture is improved,and the fatigue life predicted by the improved fatigue model is compared with the fatigue life obtained by four-point bending fatigue test.The results show that the proposed new asphalt fatigue failure criterion is reasonable,and the fatigue life predicted by the improved asphalt mixture fatigue prediction model is accurate.The research method of classifying asphalt components based on dielectric properties is simple and effective,and the components have a high correlation with the road performance of base asphalt and modified asphalt.
文摘目的探讨先期近端优化技术(POT)能否常规应用于各种分叉病变双支架术.方法选择我院近3年接受双支架治疗的分叉病变患者386例,根据是否采用先期POT,分为先期POT组178例[先期POT结合常规对吻球囊扩张(KBI)]和KBI组208例.观察2组1年不良心血管事件、KBI成功率及效率.结果在随访期内,先期POT组不良心血管事件发生率(11.2% vs 19.7%,P=0.03)和再次靶血管重建率低于KBI组(7.3% vs 13.9%,P=0.04),KBI成功率明显高于KBI组(98.3%vs88.5%,P=0.00).结论先期POT结合KBI,能提高KBI成功率及操作效率,使双支架术治疗分叉病变获得更佳临床预后.
