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Title:

Comparing Best-Fit Backcalculation Approach Incorporating Curling to Conventional Backcalculation Methods for JPCP Sections of LTPP SMP Study

Accession Number:

01626807

Record Type:

Component

Abstract:

The Seasonal Monitoring Program (SMP) within the Long-Term Pavement Performance (LTPP) was designed to study the effects of environmental conditions (e.g., temperature, precipitation) on pavement behaviors. For the LTPP sections under the SMP study, pavement evaluation using Falling Weight Deflectometer (FWD) tests at the same locations were performed at multiple times of a day to study the daily variation. For the Jointed Plain Concrete Pavement (JPCP) sections, the deflection basins at different testing times from the same testing locations varied significantly, resulting in varying layer moduli using the conventional backcalculation method. The concrete modulus is not expected to change significantly due to the daily temperature variation. It is believed that the change in contact condition between the slab and the underlying layer caused the change in the deflection basin. It is noted that the apparent shape of the slab at any time is the result of the combined effects of built-in curling, concrete shrinkage induced warping, temperature gradient, and perimeter constraining conditions at that time. Even though the causes are different, a simplistic approach of incorporating an equivalent resultant temperature gradient in JPCP backcalculation is proposed. The proposed approach eliminated the daily variation in backcalculated moduli due to curling.

Supplemental Notes:

This paper was sponsored by TRB committee AFD80 Standing Committee on Pavement Structural Modeling and Evaluation. Alternate title: Comparing Best-Fit Backcalculation Approach Incorporating Curling to Conventional Backcalculation Methods for JPCP Sections of LTPP Seasonal Monitoring Program Study.

Monograph Accession #:

01618707

Report/Paper Numbers:

17-04489

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Ye, Dan
James, Mainey

Pagination:

18p

Publication Date:

2017

Conference:

Transportation Research Board 96th Annual Meeting

Location: Washington DC, United States
Date: 2017-1-8 to 2017-1-12
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Subject Areas:

Design; Highways; Pavements

Source Data:

Transportation Research Board Annual Meeting 2017 Paper #17-04489

Files:

TRIS, TRB, ATRI

Created Date:

Dec 8 2016 11:43AM