19 June 2001
CR-5: CONCRETE JACKETING OF CONCRETE PILE
: Precast concrete piles have major deterioration due
to sulphate attack.
Description of Repairs: See Figure 7-6. In this example, the original pile section
was 40 cm (15 inches) square. The concrete jacket, as shown, is 76 cm (30
inches) in diameter. A timber encasement, with galvanized steel bands, is used
in the tidal zone. A corrugated sheet metal form is used down below the mud
line. See CPM-6 for the pumped concrete method of injecting the new concrete.
Figure 7-6 shows the top portion of the pile encased with either a pneumatically
placed (CPM-4) or hand-placed grout (CPM-1).
Applications: This method is applicable when the remaining section of pile is
structurally sound and judged to be worth saving. Jacketing versus complete
replacement is an economic decision.