The second repair phase of the project was the removal and replacement of the 3”-5” structural topping that had debonded from the existing double tees below. An initial engineering report stated that the lobby level was debonded and needed full removal and replacement. Bond testing was completed at other levels to verify the condition. After reviewing the low bond test results of the main street level of the structure required full removal and replacement of the bonded topping, while the other three levels above grade would only require localized topping repairs. Hydro demolition was the chosen method of removal over the use of jackhammering equipment. By using the 36,000 psi water jets, the team was able to shorten the scheduled repair time, and minimize the noise that impacted hotel operations. There were also areas in the topping repair zone where the double tee flange below was deteriorated that required a full removal and replacement. This full depth repair required extensive fall protection measures to ensure onsite safety. Where large areas of full depth repairs were encountered, the use of support blocking between double tee stems was installed to mitigate the pre-stressed structure from shifting.
The topping and full depth repair areas were then replaced with a fiber reinforced structural concrete. 500 cubic yards of concrete was placed over the duration of the project. Once design strength was achieved, Restruction Corporation was able to open portions of the garage for parking.
The third repair phase consisted of the installation of new plumbing lines, drains, and a urethane traffic coating. This portion of the work protected the newly repaired structure by mitigating new water intrusion. Existing cracks and joints were routed and sealed in preparation to receive the coating. The use of an epoxy mortar extended with sand was utilized in areas of the garage where there was concrete scaling. The heavy duty urethane traffic coating was applied in 3 layers: base coat, intermediate coat, and topcoat. The traffic coating works two-fold; it protects the concrete from water intrusion, and creates a wearing course for vehicular traffic that will not damage the waterproofing properties of the coating. The new plumbing was laid out to catch the existing water ponding areas that would have eventually caused more future damage to the structure.
The final phase of the project was the repainting of the garage. After years of use, with no full scale repainting project since the parking garage was built, the owner felt that in order to have a complete project they needed to increase the visual appeal of the garage. All of the existing walls, columns and beams were repainted, with different colored accent walls of the owners choosing.
This parking garage repair project required extensive collaboration between Restruction Corporation, the owner, and the engineer. The project team held weekly meetings, worked around shutdown times for events, and collaborated with city officials minimizing impact to the public. The successful repair project was completed with the ability to work as a team striving towards a common goal.
If you have a similar structure and similar needs to this project, contact Restruction Corporation today.