01550198

Component

https://doi.org/10.3141/2504-14

Dowel bar alignment is a key requirement in highway agencies’ construction specifications for jointed concrete pavement. This requirement, however, has not been rigorously enforced by most highway agencies because there has been no practical and quick means of measuring dowel alignment until recently. Since 2005, FHWA has encouraged nondestructive techniques to determine dowel alignment, principally through the use of the MIT Scan device. Separate from the measurement of dowel bar alignment is the issue of acceptable tolerances for dowel bar alignment; this involves consideration of the variability inherent in test procedures for dowel bar alignment. Many U.S. highway agencies are reevaluating decades-old tolerance limits for dowel bar alignment. This paper summarizes recent work performed for the Illinois State Toll Highway Authority to develop more rational specifications for dowel bar alignment for use on ongoing concrete pavement construction projects in the Chicago area. The specifications were developed after extensive field testing during 2013 to verify that Chicago area contractors were able to meet proposed tolerance levels in the new specification for dowel bar alignment.

01582852

15-3574

English

pp 117–123

2015

Transportation Research Record: Journal of the Transportation Research Board

9780309369176

Print

Figures (7) ; References (6)

Alignment; Concrete pavements; Construction projects; Dowels (Fasteners); Engineering tolerance; Field tests; Reinforcing bars; Specifications

Illinois Tollway

Chicago (Illinois)

Construction; Highways; Pavements; I52: Construction of Pavements and Surfacings

TRIS, TRB, ATRI

Dec 30 2014 1:11PM

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