Repair of Wood Piles Using Prefabricated Fiber-Reinforced Po

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Introduction
Scope and Objective
No effective method for both protection and structural restoration
of wood piles in waterfront facilities is discussed in the literature,
nor is such a method available in practice. Understanding the
cause and characterizing the extent of wood pile deterioration is
the first step in designing a repair method for damaged piles, as
well as in devising a protection strategy to prevent further attack
from marine organisms (Lopez-Anido et al. 2004c). The objective
of the study described in this paper is to survey the available
methods for wood pile protection and structural restoration with
the intent of developing an effective repair method.
Attaining this objective required both a literature review and a
field inspection of a harbor. A wood pile repair method that utilizes fiber-reinforced polymer (FRP) composite prefabricated
shells, shear connectors, and grouting material is proposed to address both the protection and the structural restoration needs. This
repair system provides shear transfer capability between the wood
pile and the encasing FRP composite shells, which strengthens the
damaged pile portion (Lopez-Anido et al. 2003, 2004a). The FRP
composite repair system can also reduce the rate of future deterioration by introducing a barrier that protects the wood pile from
marine borer attack. In this method, prefabricated shells are
bonded together in situ with an underwater-curing epoxy adhesive
to form the FRP composite shield or jacket that encases the wood
pile specimen. The performance of the underwater-curing epoxy
after exposure to freezing and thawing cycles was investigated
(Lopez-Anido et al. 2004b).
Two fabrication methods for the FRP composite shells are presented and compared based on the experience gained fabricating
laboratory prototypes. Then a step-by-step procedure amenable
for field installation is proposed, and a preliminary cost analysis is
conducted to assess the feasibility of the proposed system.