00615735

Component

http://onlinepubs.trb.org...trr/1991/1293/1293-012.pdf

https://scholar.google.co...seni&publication_year=1991

The United States currently has a large and growing mileage of portland cement concrete (PCC) highway pavement overlaid with asphalt concrete (AC). Evaluation of existing AC/PCC pavements and selection of second rehabilitation strategies are thus becoming increasingly pressing concerns of state highway agencies. Use of deflection test data to interpret the condition of the underlying PCC is crucial to a structural evaluation and second overlay design for this type of pavement. However, interpretation of deflection measurements is perhaps more difficult for AC/PCC pavement than for any other pavement type. Many of the available tools for backcalculation of pavement layer moduli are limited in their ability to successfully analyze AC/PCC pavement. A simple and straightforward procedure for backcalculation of AC/PCC pavement layer moduli is described. The approach is built on available closed-form solutions to backcalculation for bare PCC pavement, with adjustments made to measured deflections to account for the influence of the AC layer. An example using deflection data collected on an AC-overlaid PCC Interstate highway section indicates that the backcalculation procedure produces reasonable results that are consistent with those obtained from other backcalculation methods and with the known condition of the pavement.

This paper appears in Transportation Research Record No. 1293, Backcalculation of Pavement Moduli 1991. 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

01411133

p. 112-123

1991

Transportation Research Record

0309051010

Figures (7) ; References (32) ; Tables (3)

Adjustment factors; Asphalt concrete; Backcalculation; Concrete pavements; Deflection; Equipment maintenance; Layer coefficient (Pavements); Measurement; Modulus; Overlays (Pavements); Pavements

Equipment adjustment; Layer moduli

Data and Information Technology; Design; Highways; Maintenance and Preservation; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces

TRIS, TRB, ATRI

Sep 30 1991 12:00AM

• ACCURACY AND CONSISTENCY OF BACKCALCULATED PAVEMENT LAYER MODULI
• ADVANCED BACKCALCULATION USING A NONLINEAR LEAST SQUARES OPTIMIZATION TECHNIQUE
• CALCULATING PAVEMENT DEFLECTIONS WITH VELOCITY TRANSDUCERS
• CHARACTERIZATION OF FALLING WEIGHT DEFLECTOMETER DEFLECTION BASIN
• COMPARISON OF COMPUTER PREDICTIONS AND FIELD DATA FOR DYNAMIC ANALYSIS OF FALLING WEIGHT DEFLECTOMETER DATA
• COMPARISON OF DYNAMIC AND STATIC BACKCALCULATION MODULI FOR THREE-LAYER PAVEMENTS
• DETECTION AND DETERMINATION OF DEPTH OF RIGID BOTTOM IN BACKCALCULATION OF LAYER MODULI FROM FALLING WEIGHT DEFLECTOMETER DATA
• DEVELOPMENT OF AN ABSOLUTE CALIBRATION SYSTEM FOR NONDESTRUCTIVE TESTING DEVICES
• EFFECT OF VARIOUS LOAD DISTRIBUTIONS ON BACKCALCULATED MODULI VALUES IN FLEXIBLE PAVEMENTS
• ESTIMATION OF PAVING MATERIALS DESIGN MODULI FROM FALLING WEIGHT DEFLECTOMETER MEASUREMENTS
• FULL-SCALE ACCELERATED PAVEMENT TESTING FOR THE TEXAS STATE DEPARTMENT OF HIGHWAYS AND PUBLIC TRANSPORTATION
• RELATING DEFLECTION DATA TO PAVEMENT STRAIN