put slabs in their place
Slab lifting and stabilization applications return sunken, settling, or rocking concrete slabs to it’s original grade and sturdiness. Slab lifting and stabilizations involve the process of injection of a two-part polyurethane structural grout through the concrete under pressure via ports inserted into drill holes. This material flows into the voids under the slab, and fills them by expanding up to 20 times, raising the slab back to the preferred height. This service also helps protect the substrate beneath the slabs.
The primary cause of concrete slab failure or settling can be attributed to one of more of the following erosion, plumbing leaks, poor drainage/run off, underslab and underground water migrations, poor subgrade compaction, the concrete curing process, etc. Heavy traffic loads induce the highest slab deflections near joints and working cracks, which can cause loss of subgrade support. If left unchecked, the lack of support may cause other problems, such as faulting, spalling of joints, corner breaks, and cracking of the slab. In industrial settings, the presence of heavy machinery and even vibrations from nearby highways can cause slabs to sink over time. When left unattended, water flow (rain, drainage, etc.) will often continue to cause ongoing erosion and washouts; thereby creating larger voids and an unstable subgrade, which can lead to devastating damage and potentially grave safety hazards.
Slab lifting and stabilization is far less intrusive and can be quickly repaired and brought back to original grade during a few facility operating hours, versus the minimum 28 days required to replace or cure fresh concrete. This process is also less than half the price of replacing a new slab, with very little mess or inconvenience.
Applied Industrial Flooring has been providing slab lifting and stabilization polyurethane foams and gels for over 40 years. We prepare the slabs in question, and essentially fill the void with a two-part polyurethane foam & structural grout.
These grouts flow into the voids and cavities and fill them by expanding up to 20 times (depending on formulation). These grouts are fully expanded and traffic ready within 15 minutes (already up to 85% strength). The rigid grout re-establishes contact between the slab and the subgrade and is strong enough for heavy traffic loads. One square foot of our structural grout will support a load of over 10,000 lbs.
Upon completion, the top of the slabs may need to be ground flush with each other so the slabs are the same elevation across the joint. This is not due to the stabilization process, but rather the difference in the amount of curl from slab to slab surface.