Most concrete leaks have one thing in common—they can be stopped with the strategic use of polyurethane grouts. These grouts stop leaks by forming expansive, closed cell foams when they contact water and then adhere to concrete surfaces. Properly placed, which WE DO, urethanes can provide a permanent repair.

The use of polyurethane grouts is not new; they have been in use for 25 years. The injection of polyurethanes is a science; it is also an art. There are a variety of unique problems that exist on each project, but with experience, innovation, the right product, and the right equipment the leaks are stopped.

Injections of polyurethanes have stopped costly and damaging leaks in: CONCRETE RESERVOIRS (Above and below grade, potable and nonpotable), PARKING GARAGES, CONCRETE DAMS, EARTHEN DAMS, MANHOLES, HONEYCOMBED CONCRETE, ELEVATOR PITS, PIPE INTRUSIONS, SEAWALLS, TUNNELS, EXPANSION JOINTS, BASEMENTS, SWIMMING POOLS, ETC.

The project determines the application method and the product. Leaking expansion joints, for instance, generally require injecting into the structure to form a new water stop. Flexible hydrophobic polyurethane must be used in this instance to handle the expansion and contraction to provide a permanent repair. We have successfully used this technique in potable water reservoirs, wastewater reservoirs, swimming pools, tunnels, and parking garages. Once the leaking has been stopped the appropriate joint sealant can be installed, using the closed cell urethane as the backer rod.

Leaking cracks or honeycombed areas in below grade structures often require injecting through the structure to form a barrier membrane between the structure and the soil. Another factor in this type of injection is the rate of flow. Dual-component urethanes are engineered to set instantly (2–3 seconds) to stop very large and forceful flows (leaks in dams are an example), prior to their development, urethanes were washed away before they could react. Dual-component urethanes that develop the compressive and tensile strengths to restore structural integrity, can be used to repair leaking structural and non-structural cracks in culverts and tunnels.

Manholes, vaults, and seawalls, for example, can be waterproofed by injecting into the soil around them. This process consolidates and strengthens the soil into a monolithic, impermeable barrier. A curtain of grout encapsulates the entire structure.

Dual Component urethanes engineered to fill voids and provide structural support (up to 900 psi) can be injected beneath walkways, roadways—any slab on grade. These urethanes also migrate into the soils to stabilize and strengthen. These materials will not degrade since they are not exposed to harmful ultraviolet rays. They do not shrink because they have expanded in a restrained environment. Future settling is negligible, because the surrounding soils have been stabilized.

Injecting polyurethane can stop leaks, fill voids, provide structural support, and stabilize soils. This is a cost-effective way of restoring concrete and stopping the deterioration that moisture can cause to steel reinforcement. The application methods are varied, but each is minimally intrusive.

WE DO stop leaks and have the experience to develop the scope of work for your unique concrete restoration needs.

See Also:
SEAWALL REPAIR, SOIL STABILIZATION, CHEMICAL GROUTING, and WATER INFILTRATION/EXFILTRAION for more information on urethane injection.


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