PROJECT OVERVIEW

Structure Evaluation Engineers, Inc. (SEE)  was retained to evaluate the existing condition of the two-level post-tensioned parking garage with a total combined area of approximately 142,000 square feet or with a capacity of approximately 420 car spaces. the parking garage was approximately 20 years old. The existing waterproofing was deteriorated severely and it was no longer providing adequate protection for the post-tensioned concrete slab. Water was infiltrating into the lower level through failed expansion joints and construction joints. 

One post-tensioned tendon was failed and spalled the concrete. However, upon exposing and reviewing tendons at four locations, we found out 25% of the tendons were failed due to the corrosion at the construction (intermediate stressing) joints. SEE recommended a comprehensive repair program that included to reviewing all post-tensioned tendons, removing existing waterproofing membrane and installing new membrane, removing and replacing all deteriorated expansion joints, and repairing concrete cracks and joints.

A total of 94 tendons were repaired or replaced. New trenched drain was installed to improve surface drainage. Existing concrete approached aprons were removed and  replaced. All expansion joints were removed and replaced with a high-performanced non-metallic expansion joints. Finally, a new heavy-duty vehicular waterproofing membrane was installed to protect the concrete slab from rain water and de-icing salt. 

SEE provided structural evaluation and condition assessment, prepared the repaired bid documents for the parking garage, assisted the owner with bidding the project, and oversaw the construction.