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Title:

Comparison of Flexible Pavement Responses Computed from Dynamic and Backcalculated Moduli

Accession Number:

01660198

Record Type:

Component

Abstract:

Dynamic modulus (|E*|) testing is gaining popularity as an asphalt concrete (AC) characterization procedure for mechanistic-empirical design. In contrast, falling weight deflectometer (FWD) testing is used for field characterization of AC modulus. Considering the differences in the test procedures, attempts have been made to develop relationships between |E*| and FWD backcalculated AC modulus to allow comparison of AC behavior under laboratory and field conditions. The interconversion between field- and laboratory-measured AC modulus has focused on time-frequency relationships. This study investigated the relationship between mechanistic pavement responses computed from |E*| and backcalculated AC modulus to identify an |E*| loading frequency that produced a match between the two types of AC modulus. Data were obtained from seven test sections at the National Center for Asphalt Technology Test Track. The cross sections were modeled to conduct two sets of mechanistic analysis: one set used |E*| and the other backcalculated AC modulus. Graphical and statistical analyses of the pavement responses showed that |E*| measured at 10 Hz and 40°F correlated with backcalculated AC modulus at a similar temperature. Considering the FWD load pulse as a haversine function with an angular frequency of duration between 0.025 and 0.030s is supported by this study. It is recommended that |E*| testing at 10 Hz and 40°F be used to predict in-situ AC modulus. |E*| measured at 10 Hz and at temperatures exceeding 40°F were significantly different from the backcalculated AC modulus, and resulted in significant differences between their pavement responses and those determined from backcalculated AC modulus.

Supplemental Notes:

This paper was sponsored by TRB committee AFD80 Standing Committee on Pavement Structural Modeling and Evaluation.

Report/Paper Numbers:

18-03443

Language:

English

Authors:

Tutu, Kenneth A
Timm, David H

Pagination:

9p

Publication Date:

2018

Conference:

Transportation Research Board 97th Annual Meeting

Location: Washington DC, United States
Date: 2018-1-7 to 2018-1-11
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Uncontrolled Terms:

Comparative analysis

Subject Areas:

Highways; Pavements

Source Data:

Transportation Research Board Annual Meeting 2018 Paper #18-03443

Files:

TRIS, TRB, ATRI

Created Date:

Jan 8 2018 10:51AM