Concrete sinking, moving and settling is caused when the soil beneath the concrete shifts and moves due to the changing moisture content. When the soil becomes too saturated with water, it will heave and when dry, it will shrink and create voids beneath the concrete. This constant shifting of the soil also causes the concrete to shift, settle and move. It can be costly to remove and replace concrete. However, this will not help due to the fact that your concrete is still sitting on unstable soil. In a few years, the new concrete will need to be repaired.
The most vulnerable areas that usually need concrete repair are:
There are several methods of concrete repair including polyjacking and mudjacking. The experts at Foundation Repair Services (FRS), uses the polyjacking method for concrete repair. There are several reasons why this is the preferred method.
The difference between polyjacking and mudjacking is that polyjacking uses two liquid components to make up the polyurethane foam. Mudjacking uses a grout material that is much heavier and does not expand as polyurethane does and it does not compact the soil surrounding the concrete.
When concrete is on unstable soil, it is better to use the polyjacking method over mudjacking due to the fact that it weight 3-4 pounds per cubic foot compared to 100-150 pounds per cubic foot that mudjacking weighs. This makes polyurethane foam injection (polyjacking) less likely to overburdened already unstable soil.
There are several other advantages to the polyjacking process vs mudjacking such as: