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Evaluation and Repair of Unbonded Post-Tensioned Structures

November 27, 2019
5:00 PM - 8:00 PM
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Norwood Hotel
112 Marion Street


Presentation Overview:

Deterioration of concrete structures is a widespread problem throughout the world with the annual cost of repair exceeding US$20 billion in North America alone. The same processes which cause deterioration and corrosion of conventionally reinforced concrete structures can  also contribute to the failure of unbonded post-tensioned tendons. Early on there was little concern regarding the durability of unbonded tendons. Designers and builders believed that corrosion and water ingress would be prevented by the concrete, sheathings, and grease coating which surround the tendons and the grout pockets which cover the tendon anchorage. History however has shown that these structures are vulnerable to deterioration and present unique challenges for engineers and contractors when it comes evaluation and repair.

 This presentation will provide an overview of the various types of unbonded post-tensioned systems, causes of post-tension tendon failures, common evaluation methods, repair methodology and other considerations necessary to ensure a successful repair project.

Presenter Bio:

Derek Mizak is a Principal with Crosier Kilgour & Partners Ltd. and since joining the firm in 1997 has specialized in the investigation, assessment, restoration, and protection of existing structures with an emphasis on the repair, restoration, and protection of cast-in-place, pre-cast, and post-tensioned concrete structures. During his career with Crosier Kilgour, Derek has been called upon as an expert witness for litigation, and has presented at industry sponsored meetings, conventions, trade shows, and training sessions on topics such as concrete repair, non-destructive testing of stone cladding systems, service-life prediction of concrete structures, waterproofing of concrete structures, concrete curing and protection of concrete, and fall arrest and fall protection systems for buildings. 

Derek is a registered professional engineer in the Province of Manitoba, and past president of the ACI Manitoba Chapter.  Professional affiliations include the International Concrete Repair Institute (ICRI), Sealant Waterproofing and Restoration Institute (SWRI), and Post-Tensioning Institute (PTI).


$50.00 Member Ticket (GST Extra)

$70.00 Non-Member Ticket (GST Extra)

$18.00 Student (GST Extra)

$50.00 Employee of Corporate Member (GST Extra)