摘要
橡胶沥青应力松弛特性对评价其低温抗裂性能具有重要意义.借助BBR弯曲蠕变试验与Zener黏弹性固体模型,拟合了低温黏弹性参数,预估了橡胶沥青的应力松弛函数,提出以松弛时间评价橡胶沥青低温性能.研究表明:Zener模型对橡胶沥青BBR蠕变数据拟合度很高.橡胶沥青稳态松弛模量是一个非零值,温度越低,瞬时松弛模量越大,稳态松弛模量越高,橡胶沥青弹性固体效应越显著.松弛时间与延度之间无相关性,证明延度无法反映橡胶沥青低温黏弹性能;松弛时间与弹性回复率线性相关性较好.采用松弛时间表征橡胶沥青低温抗裂性,力学意义明确、试验温度与路面开裂温度接近,且能区分不同改性方案之间的差异.
The stress relaxation characteristics of rubber asphalt are of great significance to evaluate its low temperature crack resistance.With the help of BBR bending creep test and Zener viscoelastic solid model,the viscoelastic parameters at low temperature were fitted.The stress relaxation function of rubber asphalt was estimated,and the relaxation time was proposed to evaluate the low temperature performance of rubber asphalt.The research shows that the Zener model has a high fitting degree to the creep data of rubber asphalt BBR.The steady-state relaxation modulus of rubber asphalt is a non-zero value,and the lower the temperature,the greater the instantaneous relaxation modulus.The higher the steady relaxation modulus is,the more significant the elastic solid effect of rubber asphalt is.There is no correlation between relaxation time and ductility,which proves that ductility cannot reflect the low temperature viscoelasticity of rubber asphalt.The linear correlation between relaxation time and elastic recovery rate is good.The relaxation time is used to characterize the low temperature crack resistance of rubber asphalt,which has clear mechanical significance,the test temperature is close to the pavement crack temperature,and can distinguish the differences between different modification schemes.
作者
韩丽丽
韩红红
郑木莲
HAN Lili;HAN Honghong;ZHENG Mulian(School of Highway and Railway Engineering, Shaanxi College of Communication Technology, Xi’an 710018, China;Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064, China;Huabang Construction & Investment Group Co. Ltd., Guangzhou 510030, China)
出处
《武汉理工大学学报（交通科学与工程版）》
2021年第4期774-778,共5页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
中央高校基本科研业务费专项资金项目(310821165008)
陕西高校“青年杰出人才支持计划”(陕高教组【2018】111号)
陕西省教育科学十三五规划课题(SGH18V027)
陕西省高教学会研究课题(XGH20379)
陕西交院科研课题(YJ18008)。
关键词
橡胶沥青
Zener模型
低温
应力松弛
rubber asphalt
Zener model
low temperature
stress relaxation
