00600729

Component

http://onlinepubs.trb.org...trr/1990/1260/1260-017.pdf

https://scholar.google.co...Bell&publication_year=1990

Highway and transportation agencies have an increasing responsibility for the maintenance, rehabilitation, and management of highways, particularly with regard to asphaltic concrete pavements. Efficient and economical methods are required for determining the structural properties of existing flexible pavements. Nondestructive testing (NDT) of pavements is one of the most useful and cost-effective methods for evaluating the structural adequacy of pavements. With the wide use of NDT, in particular the deflection test, a large amount of test data can be obtained. One common use of deflection data is to determine the pavement layer moduli through backcalculation. The microcomputer program BOUSDEF for backcalculating the moduli of a pavement structure using deflection basin data is presented. The solution techniques for use in developing the program are described, including the use of the method of equivalent thicknesses, Boussinesq theory, consideration of nonlinearity of pavement materials, and consideration of overburden pressure on stress calculation. Evaluation of the program was performed by two approaches: (a) comparing the backcalculated moduli with theoretical moduli, and (b) comparing the backcalculated moduli with results from other developed backcalculation programs. The evaluation shows that the moduli backcalculated using the BOUSDEF program compare well with the theoretical moduli and also are compatible with those from other developed programs. The BOUSDEF program runs fast compared with other backcalculation programs; therefore, the program can be effectively used as a tool to make initial evaluations of deflection testing data for determining pavement layer moduli.

This paper appears in Transportation Research Record No. 1260, Measurement of Pavement Surface Condition 1990. 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

01410819

p. 166-179

1990

Transportation Research Record

0309050138

Figures (7) ; References (11) ; Tables (9)

Backcalculation; Boussinesq equation; Computer programs; Deflection; Flexible pavements; Microcomputers; Modulus of resilience; Nondestructive tests; Pavements

Data and Information Technology; Highways; Pavements; I23: Properties of Road Surfaces

TRIS, TRB, ATRI

Oct 31 1990 12:00AM

• COLLECTION OF PAVEMENT INVENTORY DATA FOR THE ILLINOIS PAVEMENT FEEDBACK SYSTEM (ABRIDGMENT)
• COMPARING MEASURED AND THEORETICAL DEPTH DEFLECTIONS UNDER A FALLING WEIGHT DEFLECTOMETER USING A MULTIDEPTH DEFLECTOMETER
• COMPUTER-BASED MODEL OF PAVEMENT SURFACES
• CORRELATION OF PROFILE-BASED AND RESPONSE-TYPE ROUGHNESS DEVICES FOR LOUISIANA'S HIGHWAY PERFORMANCE MONITORING SYSTEM
• CRITERIA FOR EVALUATING PAVEMENT IMAGING SYSTEMS
• Design friction factors of different countries versus actual pavement friction inventories
• EVALUATION OF THE FHWA PROFILOMETER AND RUT-MEASURING (PRORUT) DEVICE IN INDIANA
• EVALUATION OF THE SIOMETER AS A DEVICE FOR MEASUREMENT OF PAVEMENT PROFILES
• IMPACT OF DIGITAL FILTERING ON FWD LOAD CELL AND DEFLECTION SENSOR RESPONSES
• MICROCOMPUTER APPLICATION TO DETERMINE THE LOAD ZONING FOR LOW-VOLUME ROADS
• MODULUS AND THICKNESS OF THE PAVEMENT SURFACE LAYER FROM SASW TESTS
• MODULUS: A MICROCOMPUTER-BASED BACKCALCULATION SYSTEM
• NONDESTRUCTIVE EVALUATION EQUIPMENT FOR AIRFIELD PAVEMENTS
• PAVEMENT DISTRESS SURVEYS IN THE STRATEGIC HIGHWAY RESEARCH PROGRAM'S LONG-TERM PAVEMENT PERFORMANCE STUDY
• PROFILES OF ROUGHNESS
• SHRP LONG-TERM PAVEMENT PERFORMANCE INFORMATION MANAGEMENT SYSTEM
• SPEED EFFECT ANALYSIS AND CANCELING MODEL OF A RESPONSE-TYPE ROAD ROUGHNESS MEASURING SYSTEM
• STATE-OF-THE-ART PAVEMENT INSTRUMENTATION
• VARIABLES AFFECTING THE TESTING OF PAVEMENTS BY THE SURFACE WAVES METHOD
• VISUAL APPEARANCE OF SURFACE DISTRESS IN PCC PAVEMENTS: I. CRACK LUMINANCE
• VISUAL APPEARANCE OF SURFACE DISTRESS IN PCC PAVEMENTS: II. CRACK MODELING