00730302

Component

https://doi.org/10.3141/1540-11

http://scholar.google.com...RISH&publication_year=1996

A pavement deflectometer has been developed for continuous measurement of airfield pavements under a rolling load wheel. The rolling weight deflectometer (RWD) measures pavement deflection using a new method of laser triangulation. It also compensates for bending of the beam on which the sensors are mounted. This compensation allows accurate measurement of deflection in the presence of motion and thermal effects. The deflection measurement incorporates data from four equally spaced pavement sensors mounted on a beam. The method requires the sensors to remain in a straight line at all times. This method was previously plagued with measurement errors caused by thermal and vibrational effects. The RWD uses a laser beam to monitor the state of bending of the physical beam in real time. The bending data are used with pavement sensor data to produce accurate deflection measurements in the presence of any amount of beam bending. The bending-compensated RWD produces deflection measurements on 0.3-m (1-ft) intervals with an accuracy of 40 microns (0.0015 in.) while moving at 10 km/hr (6 mph). The RWD is composed of a towed trailer, a networked data-acquisition system, and a load platform. Its essential elements consist of a horizontally transported beam, strategically placed pavement sensors, sensors to measure beam bending, an odometer, and a data-acquisition computer. A brief history of pavement deflection methods is presented along with a description of the RWD. Preliminary field results include a comparison between data obtained by a falling weight deflectometer and the RWD.

This paper appears in Transportation Research Record No. 1540, Recent Research in Pavement Performance.

English

p. 77-82

1996

Transportation Research Record

0309059208

Figures (6) ; Photos (1) ; References (5)

Accuracy; Airport runways; Alternatives analysis; Deflection; Falling weight deflectometers; Field tests; Pavements; Speed; Thermal stresses; Triangulation; Vibration

Continuous measurement; Field measurements; Thermal effects

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

TRIS, TRB

Dec 24 1997 12:00AM

• APPLICATION OF ARTIFICIAL NEURAL NETWORKS TO CONCRETE PAVEMENT JOINT EVALUATION
• APPLICATION OF FALLING WEIGHT DEFLECTOMETER DATA FOR ANALYSIS OF SUPERHEAVY LOADS
• APPLICATION OF STOCHASTIC FINITE-ELEMENT METHOD TO DEFLECTION ANALYSIS OF PAVEMENT STRUCTURES
• ATTEMPT AT RESILIENT MODULUS MODELING USING ARTIFICIAL NEURAL NETWORKS
• COMPARISON OF SIMPLIFIED ELASTOSTATIC AND ELASTODYNAMIC MODELS FOR FALLING WEIGHT DEFLECTOMETER DATA INTERPRETATION
• DETERMINATION OF ELASTIC AND PLASTIC SUBGRADE SOIL PARAMETERS FOR ASPHALT CRACKING AND RUTTING PREDICTION
• ESTABLISHING THE CALIFORNIA DEPARTMENT OF TRANSPORTATION ACCELERATED PAVEMENT TESTING PROGRAM
• EXPERIMENTS WITH COLD MIXES ON LABORATOIRE CENTRAL DES PONTS ET CHAUSSEES FATIGUE TEST TRACK: BEHAVIOR UNDER TRAFFIC LOADS, MECHANICAL CHARACTERISTICS, AND MODELING
• FIELD VERIFICATION OF MOVING LOAD MODEL FOR PAVEMENT RESPONSE
• IMPACT OF HIGH-PRESSURE TIRES AND SINGLE-TIRED AXLES IN OREGON
• NORMAL STRESSES IN A GRANULAR MATERIAL UNDER FALLING WEIGHT DEFLECTOMETER LOADING
• PLASTICITY MODELING APPLIED TO THE PERMANENT DEFORMATION RESPONSE OF GRANULAR MATERIALS IN FLEXIBLE PAVEMENT SYSTEMS
• PREDICTION OF PAVEMENT FATIGUE FOR CALIFORNIA DEPARTMENT OF TRANSPORTATION ACCELERATED PAVEMENT TESTING PROGRAM DRAINED AND UNDRAINED TEST SECTIONS
• PROBABILISTIC FINITE-ELEMENT ANALYSIS OF AIRFIELD PAVEMENTS
• RATIONAL SELECTION OF FACTORS OF SAFETY IN RELIABILITY-BASED DESIGN OF FLEXIBLE PAVEMENTS IN SAUDI ARABIA
• REVISED PREDICTIVE MODEL FOR DYNAMIC (COMPLEX) MODULUS OF ASPHALT MIXTURES
• STATISTICAL ANALYSES OF TEMPERATURE AND MOISTURE EFFECTS ON PAVEMENT STRUCTURAL PROPERTIES BASED ON SEASONAL MONITORING DATA