Tolerances for Placement of Tie Bars in Portland Cement Concrete Pavements
Tie bars provide load transfer along longitudinal joints and prevent lane separation in jointed concrete pavements. Tie bars are normally located within the middle third of the pavement thickness and span the longitudinal joint of two slabs. Tie bars are placed by staking or by using tie bar baskets prior to the placement of the concrete or during paving via automatic inserters. Inspection of South Dakota pavements after construction using ground penetrating radar (GPR) has revealed that many bars were misaligned or missing. More bars were reported missing or misaligned when automatic inserters were used. Many states, including South Dakota, have banned the use of automatic inserters based on a lack of confidence regarding the placement of tie bars. The long-term effect on the pavement from misaligned or missing bars is unknown, but it can be assumed that additional maintenance costs and reduced pavement life are both possible.
Language
- English
Project
- Status: Active
- Funding: $150000
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Contract Numbers:
DTRT12-G-UTC08
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Sponsor Organizations:
Research and Innovative Technology Administration
University Transportation Centers Program
1200 New Jersey Avenue, SE
Washington, DC United States 20590 -
Managing Organizations:
North Dakota State University
P.O. Box 6050, Department 2880
Fargo, ND United States 58108-6050 -
Project Managers:
Kline, Robin
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Performing Organizations:
Dept. of Civil and Environmental Engineering
South Dakota State University
Brookings, SD United States -
Principal Investigators:
Wehbe, Nadim
- Start Date: 20120101
- Expected Completion Date: 20190930
- Actual Completion Date: 0
- USDOT Program: University Transportation Centers Program
- Source Data: MPC-440
Subject/Index Terms
- TRT Terms: Concrete pavements; Ground penetrating radar; Longitudinal joints; Portland cement concrete; Service life; Tie bars
- Uncontrolled Terms: Misalignments
- Geographic Terms: South Dakota
- Subject Areas: Design; Highways; Pavements;
Filing Info
- Accession Number: 01497112
- Record Type: Research project
- Source Agency: Mountain-Plains Consortium
- Contract Numbers: DTRT12-G-UTC08
- Files: UTC, RiP
- Created Date: Oct 30 2013 1:00AM