2009•Acta Petrolei Sinica(Petroleum Processing Section)Requires access
DETERMINATION OF THE SURFACE FREE ENERGY OF ASPHALT BINDERS BY SESSILE DROP METHOD
Ohn S
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Abstract
The surface free energy is an important parameter that can be used to estimate the cohesion work(cohesive strength) of asphalt binders and the adhesion work between the asphalt binder and aggregates.In addition,the surface free energy characteristics of water may be mathematically combined with the surface free energy values of the asphalt binder and the aggregates to assess the moisture susceptibility of asphalt mixture,which is composed of graded aggregates,asphalt,and air voids.The sessile drop method was employed in this study to measure the static contact angle between several strategic highway research program(SHRP) asphalt binders and probe liquids.From these measurements,the surface free energies of the asphalt binder were estimated by the Owens-Wendt method.The surface free energy results of the sessile method for the different asphalt binders were similar to the results measured by contact angle method,giving credence to the applicability of this method for evaluating different types of asphalt binders.The cohesion work of asphalt binders,which is described by surface free energy,was in agreement with that obtained from pull-off tensile strength.