00625547

Component

http://onlinepubs.trb.org...trr/1992/1355/1355-009.pdf

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

The Direct Structural Capacity Method as described in the AASHTO Guide for the Design of Pavement Structures provides a quick and simple method for analyzing pavement deflections that are collected from nondestructive testing. However, results taken from 13 sites tested bimonthly during an 18-month period showed considerable variation with temperature even after the recommended AASHTO temperature correction procedures were applied. An alternative temperature correction procedure is derived from asphalt cement (AC) concrete temperature-modulus relationships and elasticity equations used to calculate composite pavement modulus. The alternative correction procedure requires knowledge of the ratio of AC bound layer thickness to non-AC bound layer thickness, the estimated average pavement temperature, and the ratio of AC bound layer stiffness to non-AC bound layer stiffness. Although the stiffness ratio is not known before temperature correction in a Direct Structural Capacity Method analysis, it is shown that the correction procedure is relatively insensitive to errors in the estimated stiffness ratio. Therefore, an estimate of the stiffness ratio is sufficiently precise for most pavement analyses. When the alternative procedure is applied to the data from the 13 test sites, it is shown to provide more uniform results with varying temperature.

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. 75-81

1992

Transportation Research Record

030905219X

Figures (10) ; References (8) ; Tables (2)

Deflection; Layer coefficient (Pavements); Nondestructive tests; Pavements; Temperature; Variables

Correction (Mathematics); Pavement structural capacity

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

TRIS, TRB, ATRI

Dec 16 1993 12:00AM

• 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
• RADAR PAVEMENT THICKNESS EVALUATIONS FOR VARYING BASE CONDITIONS
• SIMPLIFIED, RATIONAL APPROACH TO FALLING WEIGHT DEFLECTOMETER DATA INTERPRETATION
• VARIABILITY IN ESTIMATION OF STRUCTURAL CAPACITY OF EXISTING PAVEMENTS FROM FALLING WEIGHT DEFLECTOMETER DATA