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(Automatic translation)

Experiences in the characterization of asphalt cement and aggregates using surface free energy

Allex E. ALVAREZ
Ph.D., Civil Engineer
Assistant Professor, University of Magdalena (Santa Marta, Magdalena, Colombia)

Silvia CARO
Ph.D., Civil Engineer
Assistant Professor, Universidad de los Andes (Bogota, Colombia)

Evelyn OVALLES
Ingeniera Civil
Member of GIIC, University of Magdalena (Santa Marta, Colombia)

ABSTRACT

The surface free energy (ESL) is a fundamental property that can be used to quantify the quality of interfaces or accession generated between different materials through the application of thermodynamics theory. Recent developments have enabled measurement in laboratory ESL asphalt cements (or asphalts) (b) and aggregates (c), which in turn has allowed the evaluation of asphalt-aggregate interfaces asphalt mixtures. This article's main objective is to describe these evaluations, their main advantages and applications as well as some specific results of these applications.

The ESL of asphalts evaluated was measured using the Wilhelmy Plate method, while the corresponding measurement for aggregates was carried out using the USD ( "Universal Sorption Device").

The corresponding results and analysis support the possibility of assessing asphalt-aggregate interfaces from ESL measurements to provide new information to improve the design of asphalt mixes and predicting performance.

KEYWORDS

Asphalt, Aggregate, Asphalt mix, surface free energy, Adhesion, Asphalt-aggregate interface, Moisture damage.

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