01553744

Component

https://doi.org/10.3141/2505-08

The interaction between asphalt binder and aggregate is fundamental to ensure adequate performance of asphalt mixtures, mainly in the presence of water. The work of adhesion generated between both materials directly affects the resistance of asphalt mixture to moisture damage, because it measures the ease with which water can displace asphalt binder from the aggregate surface. The objective of this study was to characterize the bond strength between asphalt and several aggregate sources. A PG 64-22 neat binder was modified with several additives to determine the effect on adhesion: polymers, nanomaterials, and adhesion promoters. To measure the strength of adhesion, the bitumen bond strength (BBS) test and contact angle measurements between asphalt binder and the aggregate surface by means of goniometry were used. The surface energy of the asphalt and the aggregate, with and without the presence of water, was estimated also. Testing was performed on all binders and on each binder–aggregate combination after (a) rolling thin-film oven (RTFO) aging and (b) RTFO and pressure aging vessel aging. The BBS results identified differences in bond strength as a result of moisture conditioning and aging. The differences depended on the aggregate source and binder type. Different failure modes were also observed (i.e., cohesive, adhesive). The results also indicated an increase in strength of adhesion associated with the aging process: the main resistance gain was observed after RTFO aging. Finally, changes in bond strength were compared with functional composition changes associated with the aging process and related to changes in performance.

01587029

15-3174

English

pp 57–65

2015

Transportation Research Record: Journal of the Transportation Research Board

9780309369312

Print

Figures (6) ; Photos; References (27) ; Tables (2)

Adhesion; Aggregates; Aging (Materials); Asphalt additives; Asphalt mixtures; Bituminous binders; Bond strength (Materials); Moisture damage; Surface energy

Highways; Materials; Pavements; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Dec 30 2014 1:04PM

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• Comparison of Concentric Cylinder and Parallel Plate Geometries for Asphalt Binder Testing with a Dynamic Shear Rheometer
• Effects of Asphalt Source, Asphalt Grade, and Inclusion of Additives on Asphalt Foaming Characteristics
• Effects of Stress Levels on Creep and Recovery Behavior of Modified Asphalt Binders with the Same Continuous Performance Grades
• Evaluation of Oxidization of Crumb Rubber–Modified Asphalt During Short-Term Aging
• Field Validation of a Thermal Cracking Resistance Specification Framework for Modified Asphalt
• Improved Practical Model for Permeability and Implications for the Design of High-Performance Hot-Mix Asphalt
• Modification of the Resistivity-Rutting Model to Use Recoverable Creep Compliance
• Prediction of Rheological and Damage Properties of Asphalt Binders That Result from Oxidative Aging
• Rheological and Chemical Characterization of Biobinders from Different Biomass Resources
• Rheological Indexes: Phenomenological Aspects of Asphalt Binder Aging Evaluations
• Study of Asphalt Aging Through Beam Fatigue Test
• Wetting Characteristics of Asphalt Binders at Mixing Temperatures