摘要
为了评价高黏度改性沥青的感温性能,并探寻一种较为合理的高黏度改性沥青温度敏感性评价方法,通过采用针入度指数(PI)法、针入度黏度指数(PVN)法、黏温指数(VTS)法、复数模量指数(GTS)法和复数指数(CNI)法来评价自制高黏度改性沥青、某国产高黏度改性沥青和SBS/树脂改性沥青的感温性能,并比较5种评价方法对高黏度改性沥青温度敏感性的适用性。试验结果表明:自制高黏度改性沥青对温度的敏感性最小,感温性能优于其他国产高黏度改性沥青,SBS/树脂改性沥青对温度敏感性最大,稳定剂有助于改善改性沥青的感温性能;在5种温度敏感性评价方法中,PVN法所采集的数据点无法满足高黏度改性沥青较广的温度域,试验精度较低,不适用于评价高黏度改性沥青的温度敏感性。PI法、VTS法、GTS法和CNI法可用于高黏度改性沥青的温度敏感性评价,其中,PI法所采用的温度范围较窄,具有一定的局限性;VTS法、GTS法和CNI法所涉及的温度域符合实际沥青路面中高黏度改性沥青的服务温度,而CNI法更好地考虑了高黏度改性沥青的黏弹性特征,故对高黏度改性沥青感温性能的评价更具准确性和合理性。
In order to evaluate the temperature sensitivity of high viscosity modified asphalt and explore a more reasonable temperature sensitivity evaluation method for high viscosity modified asphalt,the temperature sensitivity of self-made high viscosity modified asphalt,domestic high viscosity modified asphalt and SBS/resin modified asphalt are evaluated by using the methods of penetration index(PI),penetration viscosity index(PVN),viscosity temperature index(VTS),complex modulus index(GTS)and complex index(CNI),and the applicability of 5 evaluation methods to the temperature sensitivity of high viscosity modified asphalt is compared.The test result shows that(1)the self-made high viscosity modified asphalt has the least temperature sensitivity,and its temperature sensitivity is better than that of other domestic high viscosity modified asphalts,while the SBS/resin modified asphalt has the greatest sensitivity to temperature,and the stabilizer is helpful to improve the temperature sensing performance of modified asphalt;(2)among the 5 temperature sensitivity evaluation methods,the data points collected by PVN method cannot meet the wide temperature range of high viscosity modified asphalt,and the test accuracy is low,which is not suitable for evaluating the temperature sensitivity of high viscosity modified asphalt;(3)the PI method,VTS method,GTS method and CNI method can be used to evaluate the temperature sensitivity of high viscosity modified asphalt,among them,the temperature range adopted by PI method is narrow and has certain limitation;(4)the temperature range involved in VTS method,GTS method and CNI method is consistent with the service temperature of high viscosity modified asphalt in actual asphalt pavement,while CNI method better considers the viscoelastic characteristics of high viscosity modified asphalt,so it is more accurate and reasonable to evaluate the temperature sensitivity of high viscosity modified asphalt.
作者
周志刚
陈功鸿
ZHOU Zhi-gang;CHEN Gong-hong(Key Laboratory of Road Structure and Materials of Transport Industry,Changsha University of Science&Technology,Changsha Hunan 410114,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2023年第2期8-14,共7页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(51878079)
湖南省交通科技计划项目(201807)。
关键词
道路工程
温度敏感性
复数指数法
高黏度改性沥青
黏弹性
road engineering
temperature sensitivity
complex index method
high viscosity modified asphalt
viscoelasticity
