【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。更多还原

【Abstract】 In order to achieve a quantitative evaluation of adhesion from the microscopic point of view,based on the variation law of the contact angle in the process of asphalt spreading at the aggregate surface,an evaluation index that can quantitatively characterize the adhesive properties of asphalt and aggregate is presented. The image information of the contact angle is collected based on wetting theory and sessile drop method at different temperatures. The technical parameters are extracted from the fitting equation of the contact angle,and the quantitative analysis of the adhesive performance is realized. The result shows that( 1) In the process of the asphalt spreading at the aggregate surface,the equation for the relationship between the contact angle and time is in accordance with power function y = Axa,the constant term A in the power function represents the size of the initial contact angle,and the initial state of contact angle is related to the viscosity state of the asphalt at the same temperature,which represents of the asphalt. There is a linear relationship between the constant term A and the asphalt viscosity η at log-log plot.( 2) The index a of the power function represents the diffusion rate of asphalt at the aggregate surface and reflects the wetting and the adhesive properties between the asphalt and the aggregate.( 3) The diffusion rate of 3 graded matrix asphalts at the surface of diabase experimented in this research has a higher temperature sensitivity,and the wetting and the adhesive properties between the asphalt and the diabase is better than those of limestone.更多还原