Journal
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
Volume 33, Issue 9, Pages -Publisher
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)MT.1943-5533.0003847
Keywords
Surface energy; Wilhelmy plate method; Asphalt binder; Contact angle; Viscous force; Infiltration velocity
Categories
Funding
- National Natural Science Foundation of China [51778514]
- 1,000-Youth Elite Program of China
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Two common test methods to measure the surface energy of asphalt binders, the Wilhelmy plate method and the sessile drop method, have significant differences due to the influence of infiltration velocity. Mathematical models were developed to determine actual dynamic contact angles, leading to a modified Wilhelmy plate calculation method to reduce measurement deviation to less than 10%.
Two common test methods measure the surface energy of asphalt binders: the Wilhelmy plate method and the sessile drop method. In contrast to the sessile drop method, the Wilhelmy plate method introduces the influence of infiltration velocity. As a result, significant differences exist between the Wilhelmy plate method and the sessile drop method in determining the surface energy of the same asphalt binder, despite the fact that the surface energy of the asphalt is constant. To solve the problem caused by infiltration velocity, mathematical models were developed for test samples when the contact angle was obtuse, right, and acute, respectively, to determine the actual dynamic contact angles when considering the influence of infiltration velocity in the Wilhelmy plate method. Based on the relationship between the actual dynamic contact angle and infiltration velocity, a modified Wilhelmy plate calculation method is proposed. The measurements and analyses reflect that the modified Wilhelmy plate calculation method is capable of reducing deviation of asphalt surface energy measured by the Wilhelmy plate method and sessile drop method to less than 10%.
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