Our mission is to perform for our customers the highest level of quality concrete repair services at fair and market competitive prices. To maintain the highest levels of professionalism, integrity, honesty and fairness in our business relationships.
Midwest Polyfoam offers sunken concrete lifting to include: driveways, sidewalks, steps, patios, garage floors, and other residential flatwork. We will soon offer deep foam injection and flatwork repair in agricultural settings
What is Concrete Raising?
Concrete raising is a specialty concrete repair technology. In essence, we attempt to lift a sunken concrete slab by pumping polyeurethane foam through the concrete, effectively pushing it up from below.
Accounts of raising large concrete slabs through the use of hydraulic pressure date back to the early 20th century. Early contractors used a mixture of locally available soils (sometimes including crushed limestone and/or cement for strength), producing a “mud-like” substance and thus the term “mudjacking.” In recent years, contractors began using expanding polyurethane foam. Each method has its benefits and disadvantages.
The raising process generally starts with drilling access holes in the concrete, strategically located to maximize lift. These holes range in size from 3/8" up to 3" depending on the process used.
Initial material injections fill any under slab void space. Once the void space is filled, subsequent injections will start lifting the concrete within minutes. After the slabs are lifted, the access holes are patched and the work is complete. The process is rapid when compared to traditional remove and replace applications and is minimally disturbing to the surrounding areas.
Raising technology has several benefits, including:
Cost - can be significantly less expensive than new concrete
Timeliness of the repair - concrete is typically usable within hours as opposed to days with new concrete
Minimal or no environmental impact - mostly due to keeping waste out of landfills
Aesthetic - does not disturb the surrounding area and landscaping
What About Polyfoam Raising?
Foam raising uses Polyurethane in an injection process. A two-part polymer is injected through a hole less than one inch in diameter. Although the material is injected at a higher pressure than traditional cementitious grouts, the pressure is not what causes the lifting. The expansion of the air bubbles in the injected material below the slab surface performs the actual lifting action as the liquid resin reacts and becomes a structural foam.
The material injected below a slab to be lifted will first find weak soils, expanding into them in such a manner as to consolidate and cause sub-soils to become denser and fill any voids below the slab. One inherent property of expanding foams is that they will follow the path of least resistance, expanding in all directions. Another inherent property includes reaching a hydro-insensitive or hydrophobic state when cured with 100% cure times as little as 30 minutes. Closed-cell injections will not retain moisture and are not subject to erosion once in place.
Some closed-cell polymer foams have baseline lifting capabilities of 6,000 lbs per sq. ft. and leveling procedures have been performed in which loads as high as 125 tons have been lifted and stabilized in a surface area of less than 900 sq. ft. Some foams are even stronger, with compressive strengths of 50 psi and 100 psi in a free rise state. That is equal to 7,200 to 14,000 lbs per square ft of support.
Benefits of Expanding Structural Foam Leveling
Requires less clean up than Mudjacking or Limestone Grout Leveling
Mobile units can reach areas inaccessible to truck-based equipment
Does not retain moisture
Does not erode when subjected to rainwater
Lightweight and will not cause additional settling