A mixture of
about 10 percent effectiveness was being achieved.
only cement and sodium silicate was developed, that proved
successful, and the structure was sealed with this sealant
mixture. Samples, taken from exploratory holes after sealing was
completed,- indicated that the intent of the design had been
achieved.
Hydrographic surveys of the inlet taken since
completion of the project also indicate that the sealing
techniques were successful in prevention of sediment movement
through the jetty.
Port Everalades. Florida, South Jettv Sealinq:
The Port Everglades south jetty is a l,OOO-ft-long rubble-mound
The jetty was very porous, and it was estimated that
structure.
about 5,000 cu yd of sediment passed through the structure
annually. Rehabilitation plans entailed sealing the shoreward
700 ft of the jetty and restoring the beach south of the jetty.
During the period September-November 1988, the structure was
sealed. Sodium silicate-cement sealant was used for filling the
void cavities, and sodium silicate chemical sealant along with
appropriate reactants and accelerators were used to stabilize the
sand layer beneath the jetty and the sand-filled voids on the
shoreward portion of the jetty.- Sealant holes were drilled on 3-
ft centers, and solutions were injected through a 2-in hose.
The
sodium silicate-cement mixture used to fill the voids in the
structure consisted of the following ratio:
3 gal sodium
silicate plus 4.5 gal water mixed with 0.3 cu ft water plus 0.1
cu ft cement. The sand-filled voids in the jetty were sealed
with a sealant which entailed a mixture of sodium silicate and
diacetin.
A monitoring program was initiated to evaluate the effectiveness
of the sealing operations (Rosati and Denes 1990).
Dye
transmission tests and current meters placed in the structure
both before and after sealing procedures indicated that the
project significantly reduced structure permeability.
Preliminary results have indicated that the replenished sand
beach has remained in place and the project, appears to be
successful.
Ashburv Park, New Jersey, Groin Sealinq:
Deal Lake groin, near Ashbury Park, New Jersey, was rehabilitated
with asphaltic sealant in 1963. The outer 75-ft section was
rebuilt by incorporating an asphaltic hot-mix. A foundation of
r o c k , extending seaward from the existing groin tip, was first
laid.
Next, a hot asphalt-aggregate mixture was placed over the
stone for a length of about 20 ft and for the width of the groin.
Five ton stones then were specially placed on the asphalt.
The
next layer of asphalt covered those stones on all sides, and the
process was repeated until the design crest elevation had been
achieved. The asphalt acted as a binder to hold the structure
together as a monolithic mass.
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