01356812

Component

https://doi.org/10.3141/2210-13

http://scholar.google.com...tton&publication_year=2011

It is a well-known empirical fact that an asphalt mixture with a high percentage of air voids fatigues rapidly. Under repeated loading, air voids grow into cracks. A void or a crack radius follows a Weibull distribution, from which it is possible to determine both the mean air void or crack size and its variance. The ability to measure the size distribution is important in all models of aging and moisture damage. Two mixtures with the same mean air void radius may have strikingly different rates of crack propagation, aging, and moisture damage because of the size of the variance of the air void or the crack size. This paper demonstrates how to make an accurate determination of the air void and subsequent growing crack radius distribution with X-ray computed tomography (CT) and a repeated direct tension test. The proposed Weibull distribution model is more realistic than the model developed solely on the basis of results from the X-ray CT system, which does not take into account air voids and cracks smaller than the minimum detectable air voids and cracks. The accurate measurement and determination of the initial distribution of air void sizes and the subsequent distributions of the growing cracks are necessary to the development of realistic predictive models of aging and moisture damage as well as of fatigue and thermal cracking.

01356813

11-3829

English

pp 113-121

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309167468

Print

Figures (6) ; Photos (1) ; References (21) ; Tables (2)

Aging (Materials); Air voids; Asphalt mixtures; Cracking; Mathematical models; Moisture damage; Pore size distribution; Tension tests; Weibull distributions

X-ray computed tomography

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

TRIS, TRB, ATRI

Nov 14 2011 1:41PM

• Determination of Flow Number in Asphalt Mixtures from Deformation Rate During Secondary State
• Effect of Thermal Stresses on Fatigue Behavior in Bituminous Mixes
• Effects of Asphalt Mixture Properties on Permanent Deformation Response
• Effects of Nonuniform and Three-Dimensional Contact Stresses on Near-Surface Cracking
• Evaluation of Dynamic Modulus Predictive Equations for Southeastern United States Asphalt Mixtures
• Evaluation of Fracture Toughness of Semirigid Asphalt Concretes at Low Temperatures
• Evaluation of Predictive Models for Estimating Dynamic Modulus of Hot-Mix Asphalt in Oklahoma
• Factors That Affect Cracking Performance in Hot-Mix Asphalt Mix Design
• Laboratory Evaluation of Asphalt Binders and Mixtures Containing Polyphosphoric Acid
• Permanent Deformation Model Based on Shear Properties of Asphalt Mixtures: Development and Calibration
• Reduced Testing Protocol for Measuring the Confined Dynamic Modulus of Asphalt Mixtures
• Search for a Laboratory Test to Evaluate Crack Resistance of Hot-Mix Asphalt
• Significance of Confined Dynamic Modulus Laboratory Testing for Asphalt Concrete: Conventional, Gap-Graded, and Open-Graded Mixtures