Repairing a Heavily Fire-Damaged Concrete Turbine Pedestal

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Title: Repairing a Heavily Fire-Damaged Concrete Turbine Pedestal

Author(s): David D. Dorsch

Publication: Concrete International

Volume: 13

Issue: 6

Appears on pages(s): 33-38

Keywords: cooling; fire damage; formwork (construction); placing; plants; reinforced concrete; repairs; General

Date: 6/1/1991

Abstract:
Describes large-scale repairs to a fire-damaged reinforced concrete pedestal that supports a power-station generator. The concrete had spalled and cracked to depths ranging from 2 to 24 in. The form-and-pump method of repair was chosen because of the tight spacing of the reinforcing steel and the depth of the material to be repaired. The forming system required a one-sided form that was not supported from below and could contain the dead weight of the concrete plus the pumping pressure. The existing concrete was used for support; rock anchors were drilled into the concrete and coil rods, which were left in place for extra support for the concrete. Concrete was cooled at a nitrogen cooling station to help reduce the shrinkage and cracking that occurs when new concrete is cast against old material.