Resumo

ALVAREZ, ALLEX E.  e  OVALLES, EVELYN. ANALYSIS OF ASPHALT-AGGREGATE SYSTEMS BASED ON MEASUREMENTS OF SURFACE FREE ENERGY. Dyna rev.fac.nac.minas [online]. 2012, vol.79, n.175, pp.111-119. ISSN 0012-7353.

The surface free energy (SFE) is a fundamental thermodynamic material property that can be used to quantify the quality of adhesion between diverse materials, the susceptibility of these materials to loss its adhesion due to the presence of water in the system, and the coating ability of a material over another material with different SFE values (i.e., wettability). These principles can be applied to different materials, including the asphalt-aggregate systems (i.e., hot mix asphalt (HMA) mixtures). This research work aims to present an analysis, based on SFE measurements of the asphalt mixture basic constituents, to quantify the adhesion quality, moisture susceptibility, and the coating quality of the asphalt over the aggregate surface (wettability) for different asphalt-aggregate systems. The SFE measurements of asphalts and aggregates were conducted in the laboratory by applying, respectively, the Wilhelmy Plate method and the Universal Sorption Device (USD). The materials assessed included Colombian asphalts and aggregates produced in both Colombia and The United States. The analysis focused on evaluating the effect of industrial asphalt modification processes and filler addition on the quality of adhesion, moisture susceptibility, and wettability of different asphalt-aggregate systems. The results suggest that the SFE measurement of asphalts and aggregates is an efficient tool to assess the compatibility and the expected performance of diverse asphalt-aggregate systems as well as the modifications induced, at a fundamental level, by different processes used in the fabrication of HMA (e.g., mineral filler addition).

Palavras-chave : Surface free energy; fundamental material property; moisture damage; mineral filler; hot mix asphalt.

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