Concrete slab lifting, levelling and slab stabilization returns sunken, settling, or rocking concrete slabs to its original grade and sturdiness. Slab lifting and stabilizations involve the process of injecting 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 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 further erosion and washouts; thereby creating larger voids and an unstable subgrade. This can lead to devastating damage and potential safety hazards.
Slab lifting and stabilization is far less intrusive and can quickly repair and bring concrete 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.
UNLEVEl concrete solutions
Applied Industrial Flooring has been providing concrete slab lifting, levelling and stabilization using polyurethane foams and gels for over 40 years. We always prepare the slabs in question before beginning the process, and essentially fill the void behind the slab 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). This 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.