01090130

Component

https://doi.org/10.3141/2057-05

http://scholar.google.com...nter&publication_year=2008

Despite the possible benefits of implementing asphalt binder film thickness into current specifications to address durability problems, most of the related research has been theoretical and only a few attempts have been made to measure this property experimentally. The objective of this study was to investigate the concept of asphalt binder film thickness experimentally on the basis of measurements obtained by image analysis techniques, reflective light microscopy, and scanning electron microscopy. The results of the experimental program were used to gain insight into the concept of asphalt binder film thickness and its validity. Experimental results indicated that asphalt binder films coating large aggregates do not actually exist in hot-mix asphalt. Instead, what are referred to as asphalt binder films surrounding large aggregates are actually asphalt mastic films. These films are highly irregular in shape and have a thickness greater than 100 µm in the mixture considered in this study. The asphalt binder films in the mastic were observed at a thickness of 2 µm in the mixtures considered. However, these entities do not represent asphalt binder coatings around aggregates; they are only part of a blend with fine aggregates and mineral fillers. Microscopic analysis showed that air voids usually appear near the boundary between large aggregates and asphalt mastic.

01114246

English

pp 37-45

2008

Transportation Research Record: Journal of the Transportation Research Board

9780309113267

Print

Figures; Photos; References (12)

Air voids; Asphalt mixtures; Bituminous binders; Hot mix asphalt; Image analysis; Mastic asphalt

Film thickness; Microscopic analysis; Scanning electron microscopy

Highways; Materials; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Jan 29 2008 2:56PM

• Analysis of Hot-Mix Asphalt Lab Compactability Using Lab Compaction Parameters and Mix Characteristics
• Anisotropic Behavior of Hot-Mix Asphalt at Low Temperatures
• Asphalt Material Characterization in Support of Mechanistic–Empirical Pavement Design Guide Implementation in Virginia
• Backcalculation of Dynamic Modulus from Resilient Modulus of Asphalt Concrete with an Artificial Neural Network
• Cost-Comparison Methodology for Selecting Appropriate Asphalt Concrete Mixes
• Determination of Asphalt Mixture Creep Compliance at Low Temperatures by Using Thin Beam Specimens
• Effect of Laboratory Data Range Selection in Permanent Deformation Characterization of Asphalt Mixtures
• Fatigue Analysis of Asphalt Mixtures Independent of Mode of Loading
• Forensic Analysis of Premature Surface Cracking in Full-Depth Asphalt Pavements on Plastic Clays
• Fracture-Based Friction Model for Pavement Interface Characterization
• Implementation of Quality Management of Hot-Mix Asphalt with Seismic Methods
• Interface Bonding Between Hot-Mix Asphalt and Various Portland Cement Concrete Surfaces: Laboratory Assessment
• Investigation of Simple Performance Characteristics of Plant-Produced Asphalt Mixtures in Tennessee
• Probabilistic Analysis of Fracture in Asphalt Mixtures Caused by Moisture Damage
• Understanding Internal Structure Characteristics of Foamed Asphalt Mixes with Fracture Face Image Analyses
• Verification of Rutting Predictions from Mechanistic-Empirical Pavement Design Guide by Use of Accelerated Loading Facility Data
• Verification of Superpave Number of Design Gyration Compaction Levels for Georgia
• Viscoelastic Behavior of Hydrated Lime-Modified Asphalt Matrix and Hot-Mix Asphalt Under Moisture Damage Conditions