As patios, walkways, driveways, and concrete steps sink, they can crack and create uneven surfaces. Sinking concrete is unsightly, and it can create a tripping hazard. Traditionally, this problem was repaired by a process called mudjacking, or concrete jacking. Mudjacking is a repair technique for lifting concrete slabs that have settled over time with a mortar-based mix called slurry.
Aquaguard offers a faster, more effective, and less invasive approach to concrete leveling with the PolyRenewal™® concrete leveling.
Mudjacking vs. PolyRenewal™®
PolyRenewal™® and mudjacking virtually serve the same purpose: to raise concrete. When foundations begin to sink, it’s usually because there are voids that exist underneath the concrete slab. It’s nearly impossible to restore the foundation to its original level of elevation without raising the concrete and filling those voids underneath the structure. While PolyRenewal™® and mudjacking are similar in function, there are some differences between the two you should take into account before choosing one over the other.
What is Mudjacking?
In the past (and sometimes today) contractors often raised settled concrete by pumping a liquid mortar beneath the settled section. This process went by a number of names, most commonly mudjacking, slabjacking, and concrete jacking. To pump the liquid mortar, otherwise known as “slurry,” beneath the slab, concrete repair contractors would have to drill soda-can-sized holes into the concrete.
Mudjacking is fairly inexpensive and is a procedure that most contractors are familiar with.
The injection slurry is made up of natural materials with little to no negative environmental impact.
The texture of the slurry is too rough to completely fill the voids, which increases the likelihood of your concrete slab sinking in the future.
Mudjacking is a short-term fix and will have to be repeated every few years or more frequently.
The injected materials weigh 30 times more than polyurethane and can cause a new round of sinking beneath the concrete slab.
The slurry materials are prone to washing out if exposed to common causes of concrete damage (poor drainage, underground water pipe leaks, heavy rainfall, etc.).
What is PolyRenewal™®?
Fortunately, foundation and concrete repair specialists now have a new technique that’s more effective than mudjacking at raising settled concrete. Polymer injection with PolyRenewal™® harnesses the expansive force of a structural grade geopolymer to provide fast concrete leveling, fill voids in the soil, and strengthen soil that has poor load-bearing qualities.
PolyRenewal™® involves injecting a structural-grade, expanding, two-part polymer foam under the slab via tiny holes in the concrete. The polymers come out in liquid form, filling any gaps or voids underneath the concrete. The polymers then react and expand within approximately seven seconds to about 15 times their initial volume. This expansive action effectively lifts settled concrete. An experienced PolyRenewal™® technician, like those at AquaGuard Foundation Solutions, can control the application to create just the right amount of raising pressure.
The polymer begins to harden quickly after doing its raising work. Within just 30 minutes, it reaches 90% of its final strength, enabling damaged concrete roads and slabs to be put back into service right away. The speed of PolyRenewal™ polymer injection repair is another huge advantage over mortar pumping. The difference with PolyRenewal™® is that the foam is flexible during installation and thus can fold back over itself for a gentle, accurate lift. PolyRenewal™® is completely inert and waterproof, so there’s no chance it will wash out over time. And it weighs an astonishing 4 lbs per cubic foot, so it doesn’t add discernible weight to the underlying soil below.
In addition to lifting and realigning settled and/or shifted concrete, polymer injection can be done prior to construction to improve soil stability and strength. PolyRenewal™® injections can be as deep as 20ft.-30ft.
The injection is a long-lasting procedure.
Light in weight, which will not cause additional foundation sinking and will flow easily during the injection process.
Dense enough to completely fill the voids below sinking concrete.
The soil mixes well with the polyurethane injection and gets stronger over time.
Much smaller injection hole that will make the end results more attractive.
Fewer contractors have access to this procedure.
Equipment and materials are more expensive than mudjacking and often not available to smaller contractors.
This sidewalk is noticeably uneven, posing a tripping hazard to this high-traffic area. AquaGuard Foundation Solutions uses PolyRenewal™® for concrete repair to raise the concrete slab & create a safe, even surface.
PolyRenewal™® geotechnical capabilities:
- Lift settled slabs and slab foundations
- Lift and level sunken sidewalks
- Strengthen and stabilize loose soil
- Fill sinkholes and other voids
- Lift, level, and stabilize roadways and airport runways
- Repair and stabilize rail beds weakened by soil washouts
- Treat soil to improve load-bearing characteristics in preconstruction applications
While most concrete contractors don’t offer polyurethane injection as one of their repair options, we are very familiar with this state-of-the-art technology. AquaGuard Foundation Solutions provides PolyRenewal™® foam foundation repair and concrete repair services in Alpharetta, Lawrenceville, Sandy Springs, Norcross, Stone Mountain, Gainesville, Roswell, Athens, and other local areas.