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Appl. Sci. 2017, 7(2), 156; doi:10.3390/app7020156

Adhesion Evaluation of Asphalt-Aggregate Interface Using Surface Free Energy Method

1
School of Civil Engineering and Transportation, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
2
Department of Civil and Environmental Engineering, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931, USA
3
School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410114, China
*
Author to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 30 November 2016 / Revised: 25 January 2017 / Accepted: 3 February 2017 / Published: 9 February 2017
(This article belongs to the Special Issue Advanced Asphalt Materials and Paving Technologies)
View Full-Text   |   Download PDF [1863 KB, uploaded 10 February 2017]   |  

Abstract

The influence of organic additives (Sasobit and RH) and water on the adhesion of the asphalt-aggregate interface was studied according to the surface free energy theory. Two asphalt binders (SK-70 and SK-90), and two aggregate types (limestone and basalt) were used in this study. The sessile drop method was employed to test surface free energy components of asphalt, organic additives and aggregates. The adhesion models of the asphalt-aggregate interface in dry and wet conditions were established, and the adhesion work was calculated subsequently. The energy ratios were built to evaluate the effect of organic additives and water on the adhesiveness of the asphalt-aggregate interface. The results indicate that the addition of organic additives can enhance the adhesion of the asphalt-aggregate interface in dry conditions, because organic additives reduced the surface free energy of asphalt. However, the organic additives have hydrophobic characteristics and are sensitive to water. As a result, the adhesiveness of the asphalt-aggregate interface of the asphalt containing organic additives in wet conditions sharply decreased due to water damage to asphalt and organic additives. Furthermore, the compatibility of asphalt, aggregate with organic additive was noted and discussed. View Full-Text
Keywords: surface free energy; adhesion; asphalt-aggregate interface; organic additive surface free energy; adhesion; asphalt-aggregate interface; organic additive
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Ji, J.; Yao, H.; Liu, L.; Suo, Z.; Zhai, P.; Yang, X.; You, Z. Adhesion Evaluation of Asphalt-Aggregate Interface Using Surface Free Energy Method. Appl. Sci. 2017, 7, 156.

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