4.6 Article

Moisture Damage of Asphalt Based on Adhesion, Microsurface Energy, and Nanosurface Roughness

Journal

JOURNAL OF MATERIALS IN CIVIL ENGINEERING
Volume 34, Issue 10, Pages -

Publisher

ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)MT.1943-5533.0004405

Keywords

Water; Atomic force microscopy (AFM); Asphalt binder; Surface roughness; Surface energy; Adhesion

Funding

  1. National Natural Science Foundation of China [51908460]
  2. Open Fund of Key Laboratory for Special Area Highway Engineering of Ministry of Education (Chang'an University) [300102219516]
  3. Open Fund of Key Laboratory of Road Structure & Materials of Ministry of Transport (Chang'an University) [300102219520]

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This study investigated the influence of water on the adhesive behavior between asphalt binder and aggregate at various scales. The results showed that water significantly altered the surface morphology and energy of the asphalt binder, leading to a decrease in adhesion.
To explore the influence of water on the multiscale adhesive behavior between asphalt binder and aggregate, the nanosurface morphology and microsurface energy of asphalt binder and the macrobonding force between the asphalt binder and aggregate over different soaking times were examined using atomic force microscopy (AFM) and the pull-off test. Relationships between the macrobonding and the nanosurface roughness as well as the microsurface energy were analyzed. The results demonstrated that the effect of water on the surface morphology of asphalt binder was important. After immersion in water, water-induced bulges occurred on the asphalt binder surface, which further changed the nanosurface roughness and the surface energy of asphalt. As per the sensitivity results, it can be concluded that the surface energy of asphalt and the effective contact area between asphalt and aggregate were reduced because of moisture, thus resulting in the failure of adhesion.

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