01356810

Component

https://doi.org/10.3141/2210-08

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

Fatigue cracking is one of the predominant distresses that occur in hot-mix asphalt (HMA) pavements and often costs highway agencies millions of dollars in road maintenance and rehabilitation activities. Ways to minimize this distress include material screening and selecting appropriate mix designs that produce crack-resistant HMA mixes. However, no standardized laboratory tests for fatigue cracking have been universally adopted for routine mix design or screening purposes in the evaluation of HMA crack resistance. Four cracking test methods—overlay tester (OT), direct tension (DT), indirect tension (IDT), and semicircular bending (SCB)—were compared for their potential application as simple tests for the routine crack evaluation and screening of HMA mixes in the laboratory. The evaluation criteria, based on commonly used Texas mixes, included (a) rationality of the test concept and tie to field performance, (b) repeatability and variability, (c) simplicity and practicality, (d) specimen fabrication process, and (e) simplicity of data analysis. Compared with the repeated-loading OT test, preliminary findings indicated that although the monotonically increasing loading DT, IDT, and SCB tests were more repeatable, those tests could not adequately discriminate crack resistance among the mixes evaluated on the basis of the tensile strength and strain parameters. Thus none of these monotonic tests would be recommended as a simple fatigue cracking test. Additional development of the test protocols is strongly recommended, including exploration of the repeated-loading IDT and SCB tests, use of strain–fracture energy concepts, establishment of pass-or-fail criteria for screening mixes, and validation with field performance data.

01356813

11-1958

English

pp 73-80

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309167468

Print

Figures (2) ; Photos (8) ; References (16) ; Tables (7)

Asphalt mixtures; Bending; Fatigue cracking; Hot mix asphalt; Laboratory tests; Repeated loads; Tension tests; Test procedures

Bending tests; Testing protocol

Texas

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

TRIS, TRB, ATRI

Nov 14 2011 10:50AM

• Determination of Crack Size Distribution in Asphalt Mixtures
• 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
• Significance of Confined Dynamic Modulus Laboratory Testing for Asphalt Concrete: Conventional, Gap-Graded, and Open-Graded Mixtures