石油沥青针入度与温度的关联研究

Study on Correlation between Temperature and Penetration of Asphalt

针入度是表征沥青产品软硬程度和中温抗疲劳的技术指标,也是针入度分级体系的分级指标。相关文献都得出针入度的对数与摄氏温度具有非常高的相关性。但是所有文献均未涉及针入度的对数或针入度的双对数与摄氏温度、绝对温度的倒数之间的关联研究。为了探索针入度分级体系、黏度分级体系和Performance Grade分级体系之间的相关性,采用两种原油生产的10个沥青产品研究了15、25、30℃的针入度的对数和双对数分别与摄氏温度、绝对温度的倒数之间的线性相关性以及这些线性相关性的斜率和截距之间的线性相关性。通过相关系数的对比发现,国内外检索到的文献中存在将近80年的针入度的对数与摄氏温度之间的线性关系并不是表征针入度与温度之间的最优线性关系,针入度的对数与绝对温度倒数的线性相关性高于针入度的对数与摄氏温度的相关性。针入度的对数与绝对温度的倒数的线性方程中斜率和截距之间也具有很高的线性相关性。研究发现,文中所有沥青的针入度与温度之间的关系均可以用一个方程来表达。

Penetration is not only the technical parameters to characterize the soft and hard degree and anti⁃fatigue at medium temperature of asphalt products,but also the classification index of penetration classification system.The research results in the literature show that the logarithm of penetration is correlated with with Celsius temperature.But correlations between the logarithm and double logarithm of penetration with Celsius temperature,reciprocal of absolute temperature,are rarely studied.In order to investigate the correlations among penetration classification system,viscosity classification system and Performance Grade classification system,ten asphalt products produced by two kinds of crude oil were used to study the linear correlations between the logarithm and double logarithm of penetration with Celsius temperature and reciprocal of absolute temperature at 15,25 and 30℃,respectively,as well as the linear correlation between the slope and intercept of these linear correlations.Through the comparison of correlation coefficients of referenced literatures at home and abroad for the past 80 years,it is found that the linear relationship between the logarithm of penetration and Celsius temperature does not represent the optimal linear relationship between penetration and temperature,and the linear correlation between the logarithm of penetration and reciprocal of absolute temperature is better than that between the logarithm of penetration and Celsius temperature.The correlation coefficient between the slope and intercept in the linear equation between the logarithm of penetration and the reciprocal of absolute temperature is higher.It is found that the relationship between penetration and temperature of all asphalt in the previous studies can be expressed by one equation.