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The turbine deck of Ocean Vista Power Generation Station in
Oxnard, California consists of a post-tensioned concrete deck,
supported by structural steel framing, that was built in 1957
in conjunction with the turbine generator pedestal. Concerns
over the safety of the deck had come from noticeable cracking
and spalling of the concrete and visible corrosion of the
post-tensioning cables.
The existing elastomeric membrane was removed using rotary
carbide strippers. The concrete was then shotblasted to
provide the proper profile per the manufacturer’s
requirements. After the completion of the crack, spall, and
joint repairs and the carbon fiber reinforced polymer (CFRP)
installation, the elastomeric deck coating took place.
The deck retrofit project proved to be a challenge. The
repairs ranged from basic concrete repairs using conventional
methods such as epoxy injection of cracks and repairs to
spalled or delaminated areas with polymer-modified concrete,
to the use of a high-tech CFRP system to restore the deck’s
integrity. The logistics of installing the CFRP on the
deck’s soffit with very little access, and while the plant
was in 24 hour a day operation with temperatures exceeding 115°
F, (45°C) was one of the most difficult issues for the
contractor to overcome. The use of CFRP to reinforce an
industrial deck which has lost part or all of its original
prestress system is unique.
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