00739780

Component

https://doi.org/10.3141/1568-13

http://scholar.google.com...+Kim&publication_year=1997

Accurate in situ evaluation of the changes in material properties of an asphalt surface layer due to fatigue loading and rest periods is important for a better understanding of fatigue mechanisms of asphalt concrete in the field and therefore more realistic prediction of the fatigue life of asphalt pavements. A nondestructive technique based on the stress wave propagation method is presented as a means of measuring the changes in the "apparent" modulus of an asphalt surface layer due to fatigue damage growth and healing during rest periods. The method was applied to four asphalt pavements in the Federal Highway Administration Turner Fairbank Highway Research Center that were loaded by the Accelerated Loading Facility to induce fatigue damage. The dispersion analysis is performed using the Short Kernel Method on the wave transients measured at different loading cycles and after rest periods. The results indicate that (a) the test and analysis technique used provides a sensitive means of evaluating the changes in asphalt surface layer properties during fatigue loads and rest periods, (b) the elastic modulus of the asphalt layer decreases as the number of loading cycles increases in an S-shape decaying curve, and (c) the effective modulus of the asphalt layer increases because of the introduction of rest between loading cycles.

This paper appears in Transportation Research Record No. 1568, Pavement Rehabilitation and Design.

English

p. 106-113

1997

Transportation Research Record

0309059747

Figures (8) ; References (16)

Asphalt concrete; Asphalt pavements; Experimental roads; Fatigue (Mechanics); Field tests; Health care; Loads; Medical treatment; Modulus of elasticity; Nondestructive tests; Properties of materials; Repeated loads; Rest periods; Stresses; Waves

Fatigue damage; Fatigue life; Healing; Stress waves

Design; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces

TRIS, TRB, ATRI

Aug 27 1997 12:00AM

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• IMPROVED METHODOLOGY FOR DEVELOPING A LONG-RANGE PAVEMENT REHABILITATION PROGRAM
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• RELIABILITY DESIGN OF FLEXIBLE AIRFIELD PAVEMENTS: ELASTIC LAYERED METHOD
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• STRUCTURAL EVALUATION AND ANALYSIS OF INSTRUMENTED IN-SERVICE CONCRETE PAVEMENTS SUBJECTED TO HEAVY DYNAMIC LOADS
• TECHNIQUES FOR SELECTING PAVEMENT REHABILITATION STRATEGIES: PENNSYLVANIA CASE STUDIES