摘要
为了研究沥青结合料对应力吸收层沥青混合料性能的影响,选取了7种代表性改性沥青,测试了软化点、黏度、老化前后针入度、老化前后延度、老化前后黏韧性、老化前后拉伸柔度等大量结合料的指标,应用灰关联方法,对影响沥青混合料高温贯入剪切、低温弯曲、低温弯曲蠕变的因素进行了分析。实验结果表明:破坏荷载和破坏模量随改性沥青类型变化明显,沥青结合料的黏度、软化点与破坏模量和破坏荷载关联度最大,可用破坏模量来表征应力吸收层沥青混合料的抗剪强度和变形综合性能。应变能密度函数从能量角度综合评价了7种改性沥青混合料低温抗裂性能,比蠕变弯拉应力单一指标更加合理。各指标中,拉伸柔度对弯曲蠕变速率和弯曲应变能密度的影响最大,可有效评价应力吸收层改性沥青的低温变形能力。试验结果可为应力吸收层复合式路面结合料的选择与评价提供参考。
In order to study the effect of asphalt binders on the performance of the stress-absorbing layer asphalt mixture,seven kinds of representative modified asphalt were selected.Indexes such as softening point,viscosity,penetration before and after aging,ductility before and after aging,viscosity and toughness before and after aging,tensile flexibility before and after aging were tested.The grey correlation method was used to analyze the factors affecting the high temperature penetration shear,low temperature bending and low temperature bending creep of asphalt mixture.The results show that the failure load and failure modulus change with the type of modified asphalt obviously.The viscosity and softening point of asphalt binder are most related to failure modulus and failure load.The failure modulus can be used to characterize the comprehensive properties of shear strength and deformation of stress absorbing layer asphalt mixture.The strain energy density function evaluates the low-temperature crack resistance of seven modified asphalt mixtures from energy comprehensively,which is more reasonable than the single index of creep flexural tensile stress,Among all the indexes,the correlation between tensile flexibility and bending creep rate and bending strain energy density is the largest.The test results can provide reference for the selection and evaluation of stress absorbing layer composite pavement binder.
作者
郝玉峰
车法
周昊
周燕
HAO Yu-feng;CHE Fa;ZHOU Hao;ZHOU Yan(Juxian Transportation Bureau.Rizhao 276500,China;Zibo Transportation Construction and Development Center,Zibo 255000,China;Shandong High Speed Engineering Con suiting Group Co Ltd.,Jinan 250014,China;Tianjin Key Laboratory of Civil Structure Protection and Reinforcement,Tianjin Chengjian University,Tianjin 300384,China)
出处
《武汉理工大学学报》
CAS
2022年第5期28-33,共6页
Journal of Wuhan University of Technology
基金
国家自然科学基金(52108333)
天津市交通运输科技发展计划(2021-20)
陕西省创新能力支撑计划(2019KJXX-036)
陕西省科学技术厅重点研发一般项目工业领域(2020GY318)
山东省自然科学基金(ZR2021ME104)。
关键词
道路工程
抗剪性能
灰关联法
应力吸收层
road engineering
shear performance
grey relevant methodstress
stress-absorbing layer
