Application of microcalorimeter to characterize adhesion between asphalt binders and aggregates

Adhesion between asphalt binder and aggregate in a dry state as well as in the presence of water is critical to the performance and durability of asphalt mixtures. According to the literature, distress mechanisms in asphalt mixtures such as rutting, fatigue cracking, and moisture-induced damage are correlated to the nature and quality of adhesion between asphalt binder and aggregate. Surface free energy components of aggregates and asphalt binders can be used to compute the work of adhesion between the two materials in a dry condition as well as the thermodynamic potential of water to displace the asphalt binder from the surface of the aggregate. This paper presents a methodology to estimate the surface free energy components of aggregates using the microcalorimeter. The microcalorimeter is a relatively fast and simple alternative tool to estimate surface free energy components of aggregates compared to other techniques such as the gas adsorption method. In addition to surface energy measurement, the application of the microcalorimeter to directly measure the total energy of adhesion between the asphalt binder and the aggregate at mixing temperatures and the hydrophilicity of different aggregates at ambient temperatures is also demonstrated. Both of these properties influence the performance of asphalt mixtures in dry conditions and in the presence of water.

[1]  J. C. Petersen,et al.  Asphalt—aggregate bonding energy measurements by microcalorimetric methods , 1984 .

[2]  Dallas N. Little,et al.  Bitumen Surface Energy Characterization Using a Contact Angle Approach , 2006 .

[3]  D. Little,et al.  A synthesis of theories and mechanisms of bitumen-aggregate adhesion including recent advances in quantifying the effects of water , 2005 .

[4]  M. Chaudhury,et al.  Additive and nonadditive surface tension components and the interpretation of contact angles , 1988 .

[5]  Jm Rice.  Relationship of Aggregate Characteristics to the Effect of Water on Bituminous Paving Mixtures , 1959 .

[6]  Robert L. Lytton,et al.  Limits on Adhesive Bond Energy for Improved Resistance of Hot-Mix Asphalt to Moisture Damage , 2006 .

[7]  J. Craus,et al.  EFFECT OF THE FILLER ON AGGREGATE-BITUMEN ADHESION PROPERTIES IN BITUMINOUS MIXTURES , 1977 .

[8]  E K Ensley.  STUDY OF ASPHALT-AGGREGATE INTERACTIONS AND ASPHALT MOLECULAR INTERACTIONS BY MICROCALORIMETRIC METHODS: POSTULATED INTERACTION MECHANISM , 1973 .

[9]  Amit Bhasin,et al.  Development of methods to quantify bitumen-aggregate adhesion and loss of adhesion due to water , 2007 .

[10]  R L Terrel,et al.  WATER SENSITIVITY OF ASPHALT-AGGREGATE MIXES: TEST SELECTION , 1994 .

[11]  J. Douillard,et al.  Surface Gibbs free energy of minerals: some values , 1995 .

[12]  C. V. Oss,et al.  Interfacial Forces in Aqueous Media , 1994 .

[13]  Robert L. Lytton,et al.  Characterization of HMA Moisture Damage Using Surface Energy and Fracture Properties (With Discussion) , 2006 .

[14]  Dallas N. Little,et al.  Characterization of Aggregate Surface Energy Using the Universal Sorption Device , 2007 .

[15]  Dallas N. Little,et al.  Using Surface Energy Measurements to Select Materials for Asphalt Pavement , 2006 .

[16]  Hussain U Bahia,et al.  Role of adhesion and thin film tackiness of asphalt binders in moisture damage of HMA , 2003 .

[17]  Jan Scott,et al.  ADHESION AND DISBONDING MECHANISMS OF ASPHALT USED IN HIGHWAY CONSTRUCTION AND MAINTENANCE , 1978 .