Members of a homeowner association in Florida faced significant challenges with a seawall. The erosion of soil behind the structure led to sinkholes appearing throughout the property. Initially, attempts were made to backfill with gravel, soil, and concrete. However, these efforts proved insufficient. As a result, the homeowner association called in Ramjack Southeast, a Seawall Repair Network® contractor, to perform the seawall and sinkhole repair.
Repair Materials
This project involved treating 150 feet of seawall. SW-RP1, a structural polymer repair foam, was the primary material used. This eco-friendly product is NSF-certified to strict environmental standards. SW-RP1 offers exceptional durability, surpassing traditional repair materials like sodium silicate or cement grout. The repair also incorporated hydrostatic pressure control filters, which are crucial for maintaining water pressure equilibrium and preventing soil migration.
Procedures
The seawall consisted of 8-foot panels. Two types of injections were performed: seam seal injections behind each panel joint and additional injections between panel joints due to severe erosion. Following this, the hydrostatic pressure control system was installed. This involved coring through the wall and the newly installed layer of SW-RP1 structural polymer. These dewatering channels were created at the main waterline mark. Finally, pressure control filters were installed in these channels to regulate water flow and maintain hydrostatic pressure equilibrium.
Results
The combined system successfully stabilized the soil and sealed the leaks. This solution permanently stabilized the seawall structure at approximately 80% less cost than full replacement. Moreover, it required no excavation, minimizing property disruption. The solidified soil supported the structure, while the pressure control system prevented new erosion and void formations. Most importantly, the homeowner association representatives were satisfied with the outcome, having found a long-lasting seawall and sinkhole repair solution.