01475663

Component

https://doi.org/10.3141/2373-08

http://scholar.google.com...tton&publication_year=2013

This paper describes two key objectives. The first objective is to develop a method of predicting and quantifying the amount of water that can enter into a pavement system by vapor transport. The second objective is to identify the extent to which fatigue crack growth in pavement would result from such moisture accumulation. To fulfill these two objectives, a diffusion model was first established to illustrate the wetting process of the surface asphalt layer caused by the vapor migration from subgrade soil into the upper layer. Second, to quantify the degree of moisture damage induced by water vapor diffusion, fine aggregate mixture specimens were fabricated and conditioned at different levels of relative humidity (RH) in closed vacuum desiccators that allow little temperature fluctuation. Moreover, the moisture-conditioned specimens were tested with a newly developed repeated direct tension (RDT) test method to evaluate the fatigue crack growth. The RDT test greatly reduced the stress state complexity within the specimens by evenly distributing stress over the cross-sectional area of the cylindrical specimen. Compared with the previous torsional test, the newly proposed test protocol was more efficient in characterizing the moisture susceptibility of the asphalt mixture. A major finding of this study is that higher RH levels in an asphalt surface layer will induce significantly higher crack growth rates.

01517321

13-3102

English

pp 71–80

2013

Transportation Research Record: Journal of the Transportation Research Board

9780309287081

Print

Figures (9) ; References (20) ; Tables (1)

Asphalt pavements; Fatigue cracking; Fine aggregates; Humidity; Moisture damage; Surface course (Pavements); Tension tests; Water vapor

Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways

TRIS, TRB, ATRI

Feb 5 2013 12:37PM

• Approach for Quantifying the Effect of Binder Oxidative Aging on the Viscoelastic Properties of Asphalt Mixtures
• Comparison of Uniaxial and Four-Point Bending Fatigue Tests for Asphalt Mixtures
• Constitutive Modeling of Cyclic Viscoplastic Response of Asphalt Concrete
• Constitutive Modeling of Fatigue Damage Response of Asphalt Concrete Materials
• Development of Calibration Testing Protocol for Permanent Deformation Model of Asphalt Concrete (With Discussion and Closure)
• Laboratory Hot-Mix Asphalt Cracking Testing: Evaluation of Three Repeated Loading Crack Tests
• Laboratory Validation of Healing-Based Fatigue Endurance Limit for Hot-Mix Asphalt
• Local Practice of Assessing Dynamic Modulus Properties for Washington State Mixtures
• Mechanistic-Based Approach to Evaluate Rutting Susceptibility of Hot-Mix Asphalt Mixtures by Use of Dynamic Triaxial Testing
• Modified Paris’s Law to Predict Entire Crack Growth in Asphalt Mixtures
• Nonlinear Viscoelastic Behavior of Asphalt Concrete and Its Implication for Fatigue Modeling
• Permanent Deformation Characterization of Asphalt Mixtures by Using Incremental Repeated Load Testing
• Three-Dimensional Microstructural Modeling of Asphalt Concrete by Use of X-Ray Computed Tomography