A Precise Evaluation Method for Adhesion of Asphalt Aggregate

Based on the theory of surfaces and interfaces, this paper puts forward a more precise method to test the adhesive performance of asphalt and aggregate and design relevant experimental procedures. First, the relationship between the adhesive performance and the adhesive bond of asphalt and aggregate is discussed. The Van der waals interaction plays a dominant role in the analysis of three micro-interaction/Van der waals interactions, hydrogen bonds, and chemical bonds. A simplified maximum adhesive bond equation is deduced, which is related to the Van der Waals interaction. By analyzing asphalt and aggregate interface bond strength formation mechanisms, the wetting of asphalt on aggregate has a great effect on the adhesive bond based on the wetting theory. The adhesive work, known as an important wetting parameter, is taken as the index to represent the adhesive performance of asphalt and aggregate. The test method with two parameters, the contact angle e, which is asphalt on aggregate, and the asphalt surface tension v, is designed. Through tests of four types of asphalt and two types of aggregate, the results show that the adhesive work test method is characterized by clear theory, good feasibility and practicability, and high accuracy, compared with scanning electron microscope (SEM) photograph tests and boiling tests.

並列關鍵字

Adhesion ； Adhesive work ； Angle of contact ； Asphalt mixture ； Road engineering ； Surface tension

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