ABSTRACT
The adhesion of asphalt to ceramsite can affect the water stability and durability of asphalt concrete. A quantitative method was used to evaluate the adhesion of the asphalt to ceramsite to provide guidance for the engineering practice. A circular, gravel-type shale ceramsite and expanded clay were chosen as the research object and the basalt and granite were contrast. The experimental research on the adhesion of 70#(60 < PI < 80), 90#(80 < PI < 100) and SBS modified asphalt to the five aggregates respectively were carried on by using photoelectric colorimetry, and the adhesion rate was chosen as a quantitative characterization of the asphalt adhesion. The results showed that the adhesion of ceramsite to SBS modified bitumen is best while the adhesion of 90# asphalt is worst; the adhesion of the three asphalt to circular shale ceramsite are poor, but better than granite. What’s more, the viscosity of bitumen, alkali value and surface texture characteristics of aggregates were measured, then the impact of three factors on adhesion were also analyzed. The results showed that bitumen viscosity has important effects on the adhesion, the greater the viscosity of the bitumen is, and the better the adhesion to aggregate; the surface texture characteristics of aggregate have an important influence on the adhesion, but the impact of the value is much better.
