SciELO - Scientific Electronic Library Online

 
vol.29 issue2Using optimisation for calibrating finite element models for adobe wallsThermogravimetric characteristics of char obtained at high heat rate author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Article

Indicators

Related links

  • On index processCited by Google
  • Have no similar articlesSimilars in SciELO
  • On index processSimilars in Google

Share


Ingeniería e Investigación

Print version ISSN 0120-5609

Abstract

ALVAREZ-LUGO, Allex E.  and  CARO-SPINEL, Silvia. Determining surface free energy for Colombian asphalts. Ing. Investig. [online]. 2009, vol.29, n.2, pp.20-24. ISSN 0120-5609.

The surface free energy (SFE) of a material is defined as being the energy required in vacuum to create a new surface unit. This property is directly related to a material’s fracture resistance and healing properties and to its capacity for creating strong bonds with other materials. The quality of the adhesion between asphalt binders and aggregates can also be assessed by computing these materials’ work of adhesion. This value can be used as an additional parameter for selecting and appropriately combining materials for hot mix asphalt as well as a component of micromechanical models for fracture and healing within these mixtures. This paper describes in detail a technique used for measuring the SFE of asphalts based on the Wilhelmy plate method and reports the first SFE measurements available for asphalts produced in the Colombian refineries of Barrancabermeja and Apiay. Corresponding results, along with the SFE for different aggregates, were used for analysing differences in the work of adhesion for different asphalt-aggregate combinations in dry conditions. Barrancabermeja asphalt produced the highest work of adhesion amongst the materials analysed here. The results also suggested that the effect of specific mineral filler on asphalt SFE is asphalt-dependent; such effect does not necessarily lead to increasing the SFE for the corresponding asphalt-mineral filler system.

Keywords : asphalt; surface free energy; of adhesion; Wilhelmy plate method; hot mix asphalt; pavement.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License