Circa 1975, extensive deterioration of the 43,000 sq ft indoor parking structure was evident due to factors such as age, quality of original construction, and lack of protection systems. Our client was initially interested in controlling water penetration and sought advice on the most cost-effective means of maintaining the structure. However, chloride contamination of the concrete meant that the deterioration would continue.
Remedial work included:
- Bracing the existing walls and columns to maintain the stability of the structure until the replacement slab was cast
- Constructing a replacement slab, complete with good slopes, additional drains and a protection system
- Replacing and upgrading expansion joints to improve movement capability and water tightness
- Replacing lighting, sprinkler and drainage systems
- Conducting local repairs on other deteriorated elements such as columns and walls, and local injection sealing of leaking cracks and complete garage re-painting
Morrison Hershfield conducted a comprehensive condition survey and report comprising:
- Visual surveys and defect mapping
- Chain drag and hammer sounding surveys
- Corrosion potential surveys
- Electromagnetic covermeter surveys
- Concrete core testing for compressive strength and acid soluble chloride concentration
- Structural analysis of representative areas of the slab to assess its capacity to support a mastic or asphalt protection system
- Recommendations for strategies to repair the deteriorated concrete
- Detailed specifications and working drawings necessary for tendering and carrying out the remedial work
- Assistance in selecting a contractor
- Contract administration and periodic construction review services