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Title:

Study of In Situ Pavement Material Properties Determined from Falling-Weight Deflectometer Testing
Cover of Study of In Situ Pavement Material Properties Determined from Falling-Weight Deflectometer Testing

Accession Number:

01029689

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

The Vermont Agency of Transportation developed pavement design procedures patterned after the American Association of State Highway and Transportation Officials (AASHTO) pavement design model described in the AASHTO 1993 Pavement Design Guide. While the Guide provides one of the most widely used empirical design models for flexible pavement design, a factor complicating its utility is the use of an abstract quality, the structural number (SN), to quantify the strength of the total pavement structure. A consequence of the SN is the need for structural layer coefficients (ai) to characterize the component materials of the pavement structure. The Agency found it difficult to quantify these design parameters because they are difficult to assess directly, and consequently found it equally difficult to calibrate the AASHTO model to Vermont conditions. However, the Agency has developed and tested a method for determining layer coefficients using a falling weight deflectometer (FWD), and the resulting layer coefficients are representative of the in situ behavior of the pavement materials. This method is based on a model provided in the Guide for assessing the effective SN of a pavement structure. The Agency found layer coefficients determined for unbound subbases to be reasonable, while layer coefficients estimated for ACC materials were generally 25-35% higher than AASHTO’s implied maximum of 0.44. However, a statistical analysis indicates considerable support for the predictive qualities of FWD derived layer coefficients to approximate layer coefficients simulated from the in situ conditions expected to prevail in the final pavement structure.

Monograph Accession #:

01020180

Report/Paper Numbers:

06-0462

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Pologruto, Michael

Pagination:

21p

Publication Date:

2006

Conference:

Transportation Research Board 85th Annual Meeting

Location: Washington DC, United States
Date: 2006-1-22 to 2006-1-26
Sponsors: Transportation Research Board

Media Type:

CD-ROM

Features:

Figures (6) ; References; Tables (4)

Subject Areas:

Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways

Source Data:

Transportation Research Board Annual Meeting 2006 Paper #06-0462

Files:

PRP, TRIS, TRB

Created Date:

Mar 3 2006 10:21AM