00625549

Component

http://onlinepubs.trb.org...trr/1992/1355/1355-011.pdf

https://scholar.google.co...Gisi&publication_year=1992

Accurate knowledge of pavement layer thicknesses is important in many aspects of pavement management. Often this information is unknown, and records are inaccurate, out of data, or difficult to access. To date, the only method for obtaining pavement layer data has been core sampling. That is time-consuming, labor intensive, intrusive to traffic, and limited in coverage. This study investigated the capability of ground-penetrating radar to provide accurate subsurface pavement profile information. Eleven sites were selected to represent the population of pavement types present in Kansas, with a particular emphasis on variations in base type and road history. The radar results show substantial variations in pavement thickness within each 1,000-ft test section, and in general, higher values of pavement thickness than were reported in available records. These predictions, when correlated with data from 73 ground truth cores, show an accuracy of plus or minus 5% to 10%, depending on the treatment of the data. The asphalt thicknesses in this study ranged from 2.5 to 20 in. The radar data were analyzed automatically using software that operated directly on the raw radar waveforms. This software is based on an electromagnetic model of the pavement layer structure. The resulting predictions were correlated with core samples obtained in cooperation with the Kansas Department of Transportation. The results show that a radar system that combines air-launch horn antenna equipment with appropriate software can provide an effective alternative to coring for pavement thickness measurements. In addition, this system provides more information to the agency, is cost competitive, and is safer to use because it does not require lane closures.

This paper appears in Transportation Research Record No. 1355, Nondestructive Structural Evaluation of Pavements. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01405034

English

p. 90-98

1992

Transportation Research Record

030905219X

Figures (6) ; References (5) ; Tables (2)

Accuracy; Alternatives analysis; Core samples; Forecasting; Ground penetrating radar; Layer coefficient (Pavements); Pavements; Software

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

TRIS, TRB, ATRI

Dec 16 1993 12:00AM

• ALTERNATIVE METHOD FOR TEMPERATURE CORRECTION OF BACKCALCULATED EQUIVALENT PAVEMENT MODULI
• COMPREHENSIVE EVALUATION OF FIVE SENSORS USED TO MEASURE PAVEMENT DEFLECTION
• EFFECT OF DEPTH TO BEDROCK ON DEFLECTION BASINS OBTAINED WITH DYNAFLECT AND FALLING WEIGHT DEFLECTOMETER TESTS
• EFFECTS OF BUFFERS ON FALLING WEIGHT DEFLECTOMETER LOADINGS AND DEFLECTIONS (WITH DISCUSSION)
• ESTIMATING DAMAGE EFFECTS OF DUAL VERSUS WIDE BASE TIRES WITH MULTIDEPTH DEFLECTOMETERS
• EVALUATION OF A DUAL-LOAD NONDESTRUCTIVE TESTING SYSTEM TO BETTER DISCRIMINATE NEAR-SURFACE LAYER MODULI
• FIELD AND LABORATORY DETERMINATION OF ELASTIC PROPERTIES OF PORTLAND CEMENT CONCRETE USING SEISMIC TECHNIQUES
• MODELING OF GROUND-PENETRATING RADAR WAVE PROPAGATION IN PAVEMENT SYSTEMS
• NONLINEAR EFFECTS IN FALLING WEIGHT DEFLECTOMETER TESTS
• SIMPLIFIED, RATIONAL APPROACH TO FALLING WEIGHT DEFLECTOMETER DATA INTERPRETATION
• VARIABILITY IN ESTIMATION OF STRUCTURAL CAPACITY OF EXISTING PAVEMENTS FROM FALLING WEIGHT DEFLECTOMETER DATA