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Title:

SIMPLIFIED DIRECT CALCULATION OF SUBGRADE MODULUS FROM NONDESTRUCTIVE PAVEMENT DEFLECTION TESTING

Accession Number:

00641446

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309055539

Abstract:

The 1986 "AASHTO Guide for Design of Pavement Structures" proposed that subgrade moduli underlying existing pavement can be determined in a direct, closed form by using peak deflections measured at a distance from the applied load during nondestructive deflection testing. The presence of the pavement layers above the subgrade could lead to significant error in the calculated subgrade modulus when this technique is applied. Subgrade correction factors are developed by calculation of error on the basis of analysis of linear elastic simulations. Least-squares regression analysis is then used to develop an equation for predicting the error. Pavement properties calculated from field data using corrected subgrade modulus are shown to vary less with time when compared with the same properties calculated using uncorrected subgrade moduli. Using field data, the corrected, directly calculated subgrade moduli are shown to compare well to the results obtained from multilayer iterative backcalculation procedures.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1406, Construction Robotics and Automation, and Foundations Engineering. 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

Monograph Accession #:

01403255

Language:

English

Authors:

Johnson, Andrew M
Baus, Ronald L

Pagination:

p. 133-141

Publication Date:

1993

Serial:

Transportation Research Record

Issue Number: 1406
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309055539

Features:

Figures (10) ; References (11) ; Tables (3)

Uncontrolled Terms:

Correction (Mathematics)

Old TRIS Terms:

Subject Areas:

Data and Information Technology; Design; Geotechnology; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I42: Soil Mechanics

Files:

TRIS, TRB, ATRI

Created Date:

Jan 25 1994 12:00AM

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