冻融循环下纤维增韧型环氧沥青混合料损伤演化
Damage Evolution of Fiber Reinforced Epoxy Asphalt Concrete under Freeze-thaw Action
艾贤臣 1胡帮艳 2冉武平 1呙玉昊 2满长恒2
作者信息
- 1. 新疆大学交通运输工程学院,新疆乌鲁木齐 830017
- 2. 新疆大学建筑工程学院,新疆乌鲁木齐 830017
- 折叠
摘要
为了研究季冻区玄武岩纤维增韧型环氧沥青混合料的性能劣化规律,首先,通过沥青黏温曲线分析和直接拉伸性能测试,初步确定纤维长度和掺量,并对比纤维改性前后的环氧沥青混合料(EAC)的路用性能,进一步确定最佳纤维长度和掺量,形成玄武岩纤维增韧型环氧沥青混合料(FEAC)的设计流程.随后,进行低温弯曲试验,测试不同冻融损伤程度沥青混合料的弯拉强度、弯拉应变、弯曲劲度模量和弯曲应变能密度.研究结果表明:6％(质量分数)玄武岩纤维掺量的FEAC具有较好的高温性能和低温抗裂性,并保持了与EAC相当的水稳定性.随着冻融循环次数的增加,EAC和FEAC的弯拉强度、弯曲劲度模量和弯曲应变能密度逐渐降低,而弯拉应变的变化趋势则与之相反.相较于EAC,FEAC表现出更高的弯拉强度、弯拉应变和较低的弯曲劲度模量.FEAC和EAC的弯曲应变能密度冻融损伤变化均呈现明显的3段式性能下降.S形逻辑函数能够有效地描述冻融循环的损伤变化规律,其中模型参数a、k和 显示出玄武岩纤维对延缓环氧沥青混合料冻融损伤增长具有积极作用.
Abstract
In order to investigate the basalt fiber reinforced epoxy asphalt concrete deterioration law in the seasonal frozen region,firstly,the fiber length and content were preliminarily calculated by using the asphalt viscosity-temperature curve analysis and direct tensile performance test.The road performance of epoxy asphalt concrete's(EAC)was compared before and after the fiber modification,the most suitable fiber length and content were further assessed,to form the design process of basalt fiber reinforced epoxy asphalt concrete(FEAC).The flexural tensile strength,flexural tensile strain,flexural stiffness modulus,and flexural strain energy density of asphalt concrete with various degrees of freeze-thaw damage were evaluated in low-temperature bending tests.The results show that FEAC with 6％(mass fraction)basalt fiber content has better high-temperature performance and low-temperature cracking resistance,and maintain comparable water stability to EAC.The flexuraltensile strength,flexural stiffness modulus and flexural strain energy density of EAC and FEAC gradually decrease with the increase of the number of freeze-thaw cycles,while the flexuraltensile strain shows the opposite trend.Compared with EAC,FEAC shows higher flexural strength,flexural tensile strain and lower flexural stiffness modulus.The flexural strain energy density of both FEAC and EAC show an obvious three-stage performance decrease with freeze-thaw damage changes.The s-shaped logistic function can adequately explain the damage change rule of freeze-thaw cycles,the model parameters a,k,and xc show positive contribution on slowing down the rise of of freeze-thaw damage of EAC.
关键词
环氧沥青混合料/冻融循环/玄武岩纤维/损伤变量Key words
epoxy asphalt concrete/freeze-thaw cycles/basalt fiber/damage variable引用本文复制引用
基金项目
国家自然科学基金(51768070)
新疆维吾尔自治区自然科学基金(2021D01C117)
新疆维吾尔自治区自然科学基金(2022D01C396)
新疆极干旱区公路路基路面病害预防及关键技术研究(65000022859700220241)
出版年
2024
国家科技期刊平台
NSTL
万方数据