Title
Resolution to Approve a Construction Contract with the Oak Construction Corporation for the Huron Parkway Segmental Block Wall Rehabilitation Project ($72,965.00)
Memorandum
Attached for your review and approval, please find a resolution that approves a construction contract between Oak Construction Corporation and the City of Ann Arbor for the Huron Parkway Segmental Block Wall Rehabilitation Project.
Budget/Fiscal Impact
The estimated total cost of the project is $94,000.00. The work of this project will be funded through the approved Street, Bridge, and Sidewalk Millage Capital Budget.
Project Description
The Huron Parkway Segmental Block Wall Rehabilitation Project will replace damaged cap units on the segmental block retaining walls (the brown, lower walls that are directly adjacent to the roadway) that were constructed as part of the Huron Parkway Reconstruction Project in 2005. The project will also remove efflorescence that has precipitated on the walls, as well as clean and seal them.
The cap units on the segmental walls were found to be deteriorated and spalling during an inspection performed on April 28, 2015. The inspection found that the remaining portion of the walls are in good condition. The deterioration of the cap units was caused by salt-spray from the roadway and salt-laden water from the sidewalks running over the cap units and causing the concrete to deteriorate. It was discovered that these type of segmental blocks are susceptible to salt damage as they are fabricated from a "dry" concrete mixture and are more porous than conventional, wet-mixed, concrete. The replacement of the cap units along with the sealing of the walls will help prevent future salt damage to these walls.
This project was originally bid in Spring 2016, however no bids were received for the work. Consequently, the decision was made to re-bid the project at a later date. Due to existing workload within the Project Management Services Unit,...
Click here for full text