摘要
探究常温下再生剂在老化沥青体系中的扩散行为有助于沥青混合料冷再生的研究。通过浸泡法、傅立叶变换红外光谱试验(FTIR)与旋转流变仪试验,从宏、微观尺度研究不同扩散时间下,废食用油对老化沥青针入度、官能团、复数模量与相位角变化规律的影响,并将试验结果进行对比分析。同时基于分子动力学理论,建立废食用油与老化沥青分子模型,构建其界面扩散模型,根据扩散系数揭示二者在体系中的扩散行为。研究结果表明,在常温下废食用油能一定程度上恢复老化沥青的基本技术性能,补充因老化缺失的轻质组分,还原其流变性能。此外,分子动力学模拟得出废食用油分子运动速度快于老化沥青分子,说明废食用油可在较短时间内软化老化沥青。由此可知,在常温下废食用油浸润软化老化沥青效率良好。
Exploring the diffusion behavior of regenerant in aged asphalt system at room temperature is helpful to the study of cold regeneration of asphalt mixture.The effects of waste edible oil on the penetration,functional groups,complex modulus and phase angle of aged asphalt under different diffusion time were studied from macro and micro scales by immersion method,Fourier transform infrared spectroscopy(FTIR)test and rotary rheometer test,and the test results were compared and analyzed.At the same time,based on the molecular dynamics theory,the molecular model of waste edible oil and aged asphalt was established,and the interface diffusion model was constructed.According to the diffusion coefficient,the diffusion behavior of the two in the system was revealed.The results show that waste edible oil can restore the basic technical performance of aged asphalt to a certain extent at room temperature,supplement the light components missing due to aging,and restore its rheological properties.In addition,molecular dynamics simulation shows that the movement speed of waste edible oil molecules is faster than that of aged asphalt molecules,indicating that waste edible oil can soften aged asphalt in a short time.Therefore,it can be seen that the efficiency of wetting and softening aging asphalt of waste edible oil at room temperature is good.
作者
石靖文
刘梦梅
周智勇
范毜仔
吴泳豪
杨杰
魏必成
SHI Jingwen;LIU Mengmei;ZHOU Zhiyong;FAN Mizi;WU Yonghao;YANG Jie;WEI Bicheng(School of Transportation and Civil Engineering,Fujian Agriculture and Forestry University,Fuzhou 350108,China;Fujian Provincial Key Laboratory of Highway Engineering,Fujian Provincial High-speed Technical Consulting Co.,Ltd.,Fuzhou 350001,China)
出处
《功能材料》
北大核心
2025年第5期5199-5206,共8页
Journal of Functional Materials
基金
福建省高速技术咨询有限公司(福建省高速公路工程重点实验室)开放课题项目(BKY00-20231098)
福建省中青年教师教育科研项目(Kla21021A)。
关键词
废食用油
老化沥青
常温扩散
浸泡法
FTIR
流变试验
分子动力学模拟
waste edible oil
aged asphalt
diffusion at room temperature
immersion method
FTIR
rheological test
molecular dynamics simulation
