A property owner reached out to a geotech contractor for help with a leaking retention pond. The pond feeds into a creek via a concrete spillway. Over the years water has worked its way through the earthen dam and under the spillway, causing large voids and soil loss under the concrete.
The technicians selected AP Fill 720 as the repair material for this job. AP Fill 720 is a single-component, closed-cell, hydrophobic, water-reactive, phthalate-free, low-viscosity polyurethane injection resin for cutting off large water leaks and filling voids around structures. This high-strength durable material will react and expand quickly upon contact with water and is one of the top soil stabilizers on the market.
The spillway was about 15 x 15 feet in size, with one 15-foot side bordering the pond. After soil probe testing it was decided that the crew would inject AP Fill 720 directly next to the spillway on the pond side and then directly underneath the spillway via 5/8 inch drill holes in the concrete along the border with the pond. All injections were completed to a depth of four to five feet.
This project was completed within a day. The AP Fill 720 structural polymer was cured within a couple of hours after injection. The homeowners were thrilled to see their pond system, which they were heavily invested in, finally functioning as it was designed.