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Surface Preparation:
 In
order to thoroughly determine the extent of the concrete deterioration,
all exposed concrete surfaces were hydro blasted using pressure
of 4,000 to 6,000 psi and then any suspected surfaces were carefully
visually and impact hammer inspected to determine which additional
areas should be repaired.
The spalled areas were removed to a geometrically regular configuration
by saw-cutting to a depth of 1/2 inch around the perimeter of the
palled areas. Then, fifteen pound chipping hammers were used to
remove all unsound concrete and expose the reinforcing steel.
Reinforcing steel was then cleaned to white metal by abrasive bead
blasting. Reinforcing steel that was badly corroded was replaced
with new reinforcement (this occurred frequently).
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