高温条件下沥青与集料黏附性能研究

发布时间：2018-09-07 11:03

【摘要】：为了实现从细观角度对黏附性的定量评价,基于沥青在集料表面的铺展过程中接触角的变化规律,提出能够定量表征沥青与集料黏附性能的评价指标。基于润湿理论,借助躺滴法,采集不同温度条件下接触角的图像信息。从接触角的拟合方程中提取技术参数,进而实现对黏附性能的定量分析。研究结果表明:在高温条件下,沥青在集料表面铺展时的接触角随时间的变化呈y=Axa的幂函数曲线关系,幂函数常数项A表征沥青初始接触角的大小,接触角的初始状态与沥青在该温度下的黏度状态相关,常数项A与沥青的黏度取对数后满足线性关系;幂函数指数项a表征沥青在集料表面扩散速率的大小,反映了沥青对集料的润湿、黏附性能;试验研究的3种标号基质沥青在辉绿岩表面扩散速率具有较高的温度敏感性,且沥青对辉绿岩的润湿、黏附性能要好于石灰岩。
[Abstract]:In order to quantitatively evaluate the adhesion between asphalt and aggregate from a meso point of view, based on the change of contact angle of asphalt in the spreading process of aggregate surface, an evaluation index which can quantitatively characterize the adhesion between asphalt and aggregate is put forward. Based on wetting theory, the image information of contact angle at different temperature was collected by the method of lying drop. The technical parameters were extracted from the fitting equation of contact angle, and the quantitative analysis of adhesion performance was realized. The results show that under high temperature, the contact angle of asphalt spreading on aggregate surface changes with time as a power function curve of y=Axa, and the power function constant A represents the initial contact angle of asphalt. The initial state of contact angle is related to the viscosity of asphalt at this temperature, the linear relationship between constant term A and viscosity of asphalt is obtained by logarithm, and the exponential term a of power function is used to characterize the diffusion rate of asphalt on aggregate surface. It reflects the wetting and adhesion properties of asphalt to aggregates, and the experimental results show that the diffusion rate of asphalts on diabase surface is highly sensitive to temperature, and the adhesion property of asphalt to diabase is better than that of limestone.
【作者单位】：哈尔滨工业大学;交通运输部公路科学研究院;中石油燃料油有限责任公司研究院;
【分类号】：U414

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