Influence of aggregate acidic composition and temperature on asphalt/aggregate adhesion
In order to quantitatively characterize the influence of acidic composition in aggregate on asphalt/aggregate adhesion,the adsorption law of acidic component on asphalt was studied first by simulated mineral and infrared spectroscopy.Then,three types of petroleum asphalt and five types of aggregate were selected to investigate the influence mode of actual acidic components on adhesion,as well as the influence characteristics of application temperature on adhesion.The research results showed that the SiO2 content of the acidic component and the total content of SiO2+Al2O3 in actual mineral aggregate could exhibit the Logistic function relationship with the adhesion characterization parameter-spalling rate.When the SiO2 content was less than 50％,or the content of SiO2+Al2O3 was less than 63％,the spalling rate of asphalt on the aggregate surface was generally less than 5％,which was the first stable zone.When the SiO2 content was between 50％-73％,or the content of SiO2+Al2O3 was between 63％-87％,the spalling of asphalt on the aggregate surface accelerated with the increase of acidic component content,which was a sensitive zone for adhesion.The adhesion grade of asphalt could rapidly decay from level 4 to level 3 or 2.When the SiO2 content was greater than 73％,or the content of SiO2+Al2O3 was greater than 87％,the adhesion grade of asphalt was below level 2 or level 1,which was the second stable zone.In some low-temperature climate areas,acidic aggregates such as granite could be utilized normally by using ordinary asphalt mixture design methods or with appropriate anti-spalling measures.
asphalt adhesionaggregate mineral compositionacidic componentinfluence law
万方数据
维普
