Abstract: The method for restoring an underwater wood, concrete or steel piling or other underwater structure includes the steps of: placing a jacket around a portion of a piling to be restored; securing the jacket in place around the piling so as to create a closed, annular space between the piling and the jacket; injecting, in at least one location at the lower end of the annular space, an epoxy resin composition into the annular space while at the same time venting the annular space in at least one location at the upper end of the annular space until the epoxy resin composition begins to escape from the upper end of the annular space. The underwater injection jacket comprises a sheet of flexible material having an upper edge and a lower edge and which is coilable into a generally cylindrically shaped jacket about an underwater piling with first and second mating edges of the sheet adapted to be secured in place relative to each other to form the jacket about the piling.

Abstract: An epoxy resin composition which is useful for repairing concrete surfaces having an epoxy resin combined with a curing agent comprised of polyamines and phenolic accelerators. In one embodiment, the epoxy resin is conditioned with a resin modifier comprised of glycidylethers and phenolic and phosphite accelerators prior to being combined with the curing agent. The method for making the curing agent includes a first stage in which an aliphatic polyamine is combined with Bisphenol A and heated to 125.degree. C. for one hour and allowed to cool to room temperature and a second stage in which a second polyamine and an accelerator is added to the product of the first stage. In one embodiment of the method for preparing the curing agent, phenol is added to the mixture of the first stage when the mixture has cooled to 65.degree. C.