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Field Trip & Tour of Concrete Pavement Projects

July 12th, 2007

Click any image to go to NDRM&CPA "Tours" photo album.

Two concrete pavement projects were toured. The first project was the US Hwy. 10 Unbonded Overlay project near Hawley and was visited in the morning. The I-29 Fargo project was visited in the afternoon. Participants for the Hwy. 10 project were as follows:

Objective of the field trip was to develop an understanding of the use of concrete pavements for maintenance type work for highway improvements by MNDOT. The Hwy. 10 Unbonded Overlay (UBOL) Project consisted of a doweled 7 inch concrete pavement constructed in lieu of a structural asphalt overlay over the existing 40 year old concrete pavement. Concrete was selected because of the superior life cycle cost comparison to the asphalt overlay option. In addition, many features of the UBOL type project are similar to whitetopping.

All field trip participants initially met at the Hawley Community Center. Matt Zeller provided a PowerPoint Presentation on UBOL projects to identify the features provided in this project and other project options. Following the UBOL presentation, Matt also provided a presentation on whitetopping design & construction experiences in Minnesota.

Discussions during & following the presentations included ride/smoothness standards for the UBOL project, payment through square yard-cubic yard pricing structure, adjustment of pavement grade, jointing patterns, characteristics of debonding asphalt layer, provision for culvert replacement, shoulder features, curing compounds, dowel basket anchorage, dowel bond breaker characteristics, traffic handling and project schedule, paving production, stringline controls, and concrete mix characteristics. Formal discussions were followed by a trip to the concrete plant followed by visitation to the paver train. Informally, discussions were noted on possible ND projects with characteristics appropriate for the Concrete UBOL technology.

Interstate 29 project at Fargo visited in afternoon.

Appendix:

Notes on Discussions of Hwy 10 Concrete UBOL Pavement Project Contractor: Central Specialties/Progressive Contractors, Inc. (concrete) Project Incentives: A Plus B Contract Smoothness Standards: First Project in State (Test Project) to Use IRI: 60 ipm Pavement Cost: About $21.50 per square yard with dowels included for nominal 7 to 7.5” thickness (Payment on sq. yd./cubic yd. basis) Jointing Pattern 15 ft. Joint Spacing Shoulders: 2 ft. Concrete with Asphalt Extensions Debonding Layer: 1 inch permeable asphalt Dowel Bar Bond Breaker: Field sprayed form oil Curing Compound: California Resin type (Alpha-Methyl-Styrene) Paving Production: About 1 mile per day (both lanes) Traffic Handling: Moved to other side of median (head-to-head) Paver Controls: Double Stringline Mix Characteristics: 530 lbs cementitious: 400 lbs. cement Minimum 1.5 inch max. size aggregate Five bins feeding three conveyors 8 to 18 percent retained for incentive (attained) 0.35 W/C ratio for incentive (attained) Culvert Replacement: All centerline culverts were jacked

Clayton Schumaker, Materials & Research Lab

Stephanie Weigel, Planning & Programming Department

Brandon Beise, Design Department

Jack Smith, Maintenance & Engineering Dept.

Greg Semenko, Devils Lake District

Joe Peyerl, Fargo District

Willie Schacher, Fargo District

Amy Hardy, Design Department

Nathan Halland, Devils Lake District

Matt Zeller, Concrete Pavement Association of Minnesota

Jesse Miller, Project Manager, Detroit Lakes District – MNDOT

Brigette Miller, Soils/Pavements Engineer, Detroit Lakes District

David Sethre, ND Chapter, Inc. – ACPA

Gary Shonyo, Project Superintendent, Progressive Contractors, Inc.