00741858

Component

https://doi.org/10.3141/1570-02

http://scholar.google.com...okoe&publication_year=1997

The Texas mobile load simulator (TxMLS) is a newly developed accelerated pavement testing device used to evaluate pavement performance under real trafficking loads. This evaluation is performed by applying trafficking loads and monitoring surface distress, such as cracking and rutting, in conjunction with a number of other measurements of the pavement, such as those conducted with the falling weight deflectometer, multidepth deflectometer, strain gauge, pressure cells, and seismic (stress-wave) tests. A procedure for monitoring the progressive degradation of the asphalt surface was developed using the spectral-analysis-of-surface-waves (SASW) technique. This procedure was applied with the TxMLS and proved to be equally effective. SASW tests that were performed intermittently between trafficking phases on trafficked and untrafficked areas show (a) the effect of temperatures and frequencies on the asphalt moduli, (b) the importance of temperature and frequency corrections in analyzing the degradation of the asphalt surface layer, and (c) the long-term trends in surface-wave velocities (and hence, moduli) of the surface layer with increasing number of load applications. It was found that stiffness of the asphalt layer in the longitudinal direction was progressively reduced under trafficking. Concurrently, surface cracking progressively increased. The reduction in longitudinal stiffness occurred at a faster rate than the crack growth. In contrast, the reduction in the stiffness of the asphalt layer in the transverse direction was slower, probably because the main mode of cracking was transverse. The feasibility of using SASW testing as a predictor of degradation and imminent cracking was confirmed with these studies.

This paper appears in Transportation Research Record No. 1570, Pavement Research Issues.

English

p. 10-22

1997

Transportation Research Record

0309061539

Figures (12) ; References (8) ; Tables (1)

Accelerated tests; Asphalt pavements; Cracking; Detection and identification; Detectors; Frequency (Electromagnetism); Modulus of elasticity; Monitoring; Rayleigh waves; Spectrum analysis; Stiffness; Surfaces; Temperature; Thermal stresses

Spectral analysis of surface waves

Texas Mobile Load Simulator

Longitudinal; Surface cracks; Transverse

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

TRIS, TRB, ATRI

Sep 30 1997 12:00AM

• ANALYSIS OF LTPP PROFILE DATA FOR JOINTED CONCRETE PAVEMENT SECTIONS
• BACKCALCULATION ANALYSIS OF PAVEMENT-LAYER MODULI USING GENETIC ALGORITHMS
• CRACK DEVELOPMENT IN LINEAR TRACKING TEST PAVEMENTS FROM VISUAL SURVEY TO PIXEL ANALYSIS
• DEVELOPMENT OF PROTOTYPE VIDEO-BASED SENSOR FOR VEHICLE DETECTION FROM STAND-STILL IMAGES
• DIPLOBACK: NEURAL-NETWORK-BASED BACKCALCULATION PROGRAM FOR COMPOSITE PAVEMENTS
• DYNAMIC PERFORMANCE OF COMPOSITE PAVEMENTS UNDER IMPACT
• EFFECT OF INITIAL PAVEMENT SMOOTHNESS ON FUTURE SMOOTHNESS AND PAVEMENT LIFE
• EFFECT OF VEHICLE-PAVEMENT INTERACTION ON PAVEMENT RESPONSE
• EVALUATION OF FATIGUE CRACKING
• EVASION OF WEIGHT-ENFORCEMENT STATIONS BY TRUCKS
• INVESTIGATION OF BACKCALCULATED MODULI USING DEFLECTIONS OBTAINED AT VARIOUS LOCATIONS IN A PAVEMENT STRUCTURE
• LINEAR TRACKING PERFORMANCE TESTS ON FULL-DEPTH ASPHALT PAVEMENT
• LINEAR TRACKING RESPONSE MEASUREMENTS: DETERMINING EFFECTS OF WHEEL-LOAD CONFIGURATIONS
• MALFUNCTION DETECTION AND DATA REPAIR FOR INDUCTION-LOOP SENSORS USING I-880 DATA BASE
• MONTANA'S AUTOMATED DEFLECTION ANALYSIS PROCEDURE
• PRIMARY RESULTS FOR THE FIRST TEXAS MOBILE LOAD SIMULATOR TEST PAD
• ROADWAY-VEHICLE INTERACTION, PHYSICAL INDEXES, AND HUMAN JUDGMENT OF RIDE QUALITY
• RUTTING DEVELOPMENT IN LINEAR TRACKING TEST PAVEMENTS TO EVALUATE SHELL SUBGRADE STRAIN CRITERION
• SINGLE-MEASUREMENT ESTIMATION OF IN SITU ASPHALT-LAYER MODULI WITH PORTABLE FALLING WEIGHT DEFLECTOMETER
• TEMPERATURE CORRECTION OF BACKCALCULATED MODULI AND DEFLECTIONS USING LINEAR VISCOELASTICITY AND TIME-TEMPERATURE SUPERPOSITION
• USING ARTIFICIAL NEURAL NETWORKS AS A FORWARD APPROACH TO BACKCALCULATION
• USING GEOGRAPHIC INFORMATION SYSTEM TECHNOLOGY TO SYNTHESIZE CENSUS AREAWIDE AND LINEAR HIGHWAY DATA FOR LOCATION OF WEIGH-IN-MOTION SITES