Скачать или смотреть (Poly Foam Versus Mudjacking Weight and Concrete Leveling)

From Concrete Chiropractor®: (https://concretechiropractor.com/poly...) Poly foam as a concrete raising product is being promoted as a better alternative to mudjacking due to it's weight. But let’s look at concrete settlement and what percentage material weight plays as a factor.

Product weight may not be a critical factor for concrete raising because the process of concrete raising, also known as concrete lifting or slabjacking, involves injecting a liquid material, such as a polyurethane foam or a cement slurry, into voids or gaps beneath a sunken concrete slab or structure. The injected material expands and hardens, effectively lifting and leveling the concrete surface.

Since the material is injected into voids and gaps, rather than being placed on top of the concrete, the weight of the material is not a significant concern. Instead, the pressure and volume of the injected material are the primary factors that affect the lifting and leveling of the concrete.

In addition, the injected material is typically lightweight compared to the weight of the concrete slab, so even if the weight of the material did play a role, it would be relatively insignificant compared to the weight of the slab being lifted.

The main cause of concrete settlement is loosely backfilled soils. You will notice this around the soil perimeter of some homes and buildings. These soils will settle without any concrete or weight being placed on the soil surface. So how significant is weight when it comes to concrete settlement? Very insignificant. Here is why: The average two story home weighs roughly 240,000 and 360,000 pounds. The home footing rests on undisturbed soil, so settlement is uncommon. Why? Because solid soils have an average weight bearing capacity of 1500 to 3000 pounds per square foot! While concrete weighs roughly 100 to 150 pounds per cubic foot, and poly foam 4 pounds per cubic foot, you can clearly see this is not a significant factor when it comes to concrete settlement due to base failure at only 5% to 10% of the overall weight bearing capacity.