Alchatek Blog

In this post I'll provide an overview of AP Lift 430, 440, and 475. Each product in the AP Lift series has its own distinguishing attributes.

What are AP Lift Foams?

AP Lift Foams are two component, high strength, high density, and hydro insensitive polyurethane foams designed for concrete leveling. AP Lift Foams are among the most resilient and dependable slab jacking foams available.

What are the applications and advantages?

AP Lift polyurethane foams are able to lift concrete slabs, stabilize soil, fill abandoned pipes, fill voids, and also supplement sinkhole remediation. These polyurethane resins exhibit very high strengths. In addition, they work in wet environments by displacing water. Also an advantage, AP Lift foams can be traffic ready in as little as 15 minutes.

Specific descriptions of each foam in the AP Lift series:

AP Lift 430

Two component, high strength, high density, hydro insensitive structural polyurethane foam.  2.75 to 3.25 pounds per cubic foot.

AP Lift 440

Two component, high strength, high density, hydro insensitive structural polyurethane foam.  3.75 to 4.25 pounds per cubic foot.

AP Lift 475

Two component, high strength, high density, hydro insensitive structural polyurethane foam.  4.5 to 5.0 pounds per cubic foot.  Also available in a slow version.  Certified to NSF 61-5 (Approved for contact with drinking water).

Want more information on concrete leveling?

Sometimes lifting concrete slabs with polyurethane is about more than just making something structurally sound and level again.  In every town there are buildings sitting empty because the floors are not in sufficient shape for use by a business.   Imagine the service a concrete leveling contractor can provide by bringing slabs back into tolerance and allowing an empty space to become a revenue stream for the building owner.  This is what our contractor in Omaha Nebraska,The Rite Touch, did recently.

In downtown Omaha there are a lot of historic buildings.  Located on the site of the old stockyards, there is a building constructed in 1911 that had been used as a parts depot for many years; including parts for World War II era Jeeps.  Some of those are still there.  The owners of the building have converted some of it into a commercial laundry equipment distribution facility, but there was a section with sagging floors that really couldn’t be used effectively.

Some research on the internet led them to our customer in Omaha, The Rite Touch.  They have been doing concrete lifting and leveling for a few years now (in addition to spray foam and polyurea flooring systems).  This particular lift was a little tricky because the concrete literally had a belly, or sag, down the center.  The owner’s idea was to create an office space with partitions / cubicles for small businesses.  However, the current floor condition would have everyone’s office chair rolling to the center of the building.   Not good!  How would the floor react as they tried to bring it up a couple of inches?  I was onsite as a consultant to help them find out!

We gave ourselves a reward to shoot for if the lift was successful; a big slab of Omaha prime rib.  With that as a motivation we got to work slowly working our way across the floor and back.  Using zip levels, dial indicators, and instinct developed from other jobs, we slowly brought the old floor back into tolerance.  The product we selected for this project was AP Lift 430 and it worked beautifully.  The new MixMaster Pro injection gun performed as advertised and allowed for an efficient installation of the poly foam.  Although we had to drill multiple holes for the targeted injections, we only used three total injection ports.

Now the final touches are being added to this soon-to-be office space.  The owners will have multiple tenants paying rent and a once unusable space as a revenue generating property.  If you’re a property owner with a similar issue, call us to get hooked up with a contractor who can help.  If you’re a contractor, keep your eyes peeled for similar opportunities.  They are all over the place.  Now, about that prime rib….

Want more info on polyurethane slab lifting?

While consulting with a customer on a recent job, I happened to capture a great video clip of the MixMaster Pro slab lifting gun in action. I've included the footage at the bottom of this blog post. It's important to note that this video was NOT sped up. You'll see a slab lifted in real time by the MixMaster Pro.

This two-component resin injection gun is manufactured specifically for lifting concrete slabs, and is designed to handle back-pressure. 

Want more info on the MixMaster Pro?

Since we haven’t discussed it very much in our blog posts, you may be surprised to learn how much we have to offer on large scale and international projects. In this post I’ll share a list of recent examples to provide a sense of how we can assist in these types of situations.

New York City, New York - Metropolitan Transit Authority

AP Seal 500 leak seal resin was used to repair thousands of feet of cracks through­out new subway tunnels.

Toquepala, Peru - Southern Peru Copper Mine

On this job, we provided the crew with AP Lift 440 rigid polyurethane foam to stabilize loose soil beneath a concrete building. We also provided on-site consulting services.

Guangzhou, China - Guangzhou Highway

We provided AP Lift 475 foam and on-site consultation for soil stabilization and the lifting of a bridge approach slab.

Saskatchewan, Canada – MGM Seed and Grain

AP Lift 440 was used to level 900,000 lbs of interior sunken concrete slabs. We also provided on-site technical consulting. Later, 24” thick slabs supporting grain silos were raised and stabilized.

Tijuana, Mexico – Federal Courthouse

On this project, AP Soil 600 stabilization foam was used to shore up the foundation beneath a sinking multi-story concrete building.

Cincinnati, Ohio – Cincinnati Zoo

In the African Lion Exhibit there was a leak in the concrete moat that surrounds the enclosure. AP Seal 500 was applied to the problem areas to stop the water flow and prevent the unnecessary loss of water.

Conclusion

Regardless of the location or size of your job, we’re here to help. We have extensive experience consulting on locations all over the globe and our products are proven performers on the largest, most challenging projects.

Want more in-depth info on AP products?

As the end of the year approaches, it feels appropriate to take a look back at some the most popular Alchemy Polymers blog posts.  A quick look at the stats on the day I write this article reveals the top posts to be Slab Jacking with Polyurethane Foam – How Strong is Strong Enough?, Stop Erosion Through Your Seawall with Polyurethane and Permeation vs. Compaction Grouting in Sandy Soils.

Slab Jacking with Polyurethane Foam – How Strong is Strong Enough?

This is one of our earlier posts and it still proves to be immensely popular. It's not hard to figure why so many people look into an article on this particular subject. One of the first questions to come to mind for anyone new to this "foam" technology is - will it hold up? The answer, of course, is a resounding YES! In this post I explain why that is the case. If you're interested in the strengths of our various lifting foams, how they hold up compared to clay and bedrock, and what types of jobs you can do with them - you need to read Slab Jacking with Polyurethane Foam – How Strong is Strong Enough?

Stop Erosion Through Your Seawall with Polyurethane

This post lays out the causes of seawall erosion, the costs of replacement, and the case for repair with polyurethane resin. More and more people are repairing seawalls with our environmentally safe polymers. We have a great deal of literature and information regarding this process if you're interested. In the meantime, for a basic overview, check out Stop Erosion Through Your Seawall with Polyurethane.

Permeation vs. Compaction Grouting in Sandy Soils

This article compares two different types of soil stabilization techniques for sandy soils: permeation grouting and compaction grouting (aka fracture grouting). Permeation grouting is done using a one component, low viscosity resin that slowly soaks into the soils with minimal disruption. Compaction/fracture grouting is done using a plural component, high viscosity resin that pushes the soil together in a more forceful manner. For more on this subject, read Permeation vs. Compaction Grouting in Sandy Soils.

Want more in-depth info on slab jacking, seawall repair and soil stabilization?

Among the leading high density polyurethane foam products available, AP Lift 475 offers a powerful solution that is traffic ready in 15 minutes. This two-component, high-strength, high-density, hydro-insensitive structural polyurethane foam supports 14,000 lbs per square foot. Also see our AP Soil 600 for Permeation Grouting. 

Applications

• Lifting and filling voids under concrete slabs.
  
• Stabilizing soil.
• Compaction grouting and fracture grouting.
• Sinkhole remediation.
• Wet compaction grouting and void filling.

Advantages

• High strength.
• Low viscosity.
• Works in wet environments - displaces water.
• Bonds with soil and concrete.
• Traffic ready in 15 minutes.
• Closed cell compaction grout.
• Certified To NSF 61-5 (approved for contact with drinking water).

Check out the AP Lift 475 sample demo!

Want in-depth info on slab lifting?

We're happy to announce that Alchemy Polymers has been profiled in a feature article on SprayFoamInsider.com. This is a good match, since we get a lot of interest from spray foam professionals looking to expand their skill set into slab lifting and other forms of concrete repair. After doing a fair amount of background research, Editor Jay Davidson has written an overview of our company's mission and the solutions we offer for critical concrete infrastructure issues.

The article opens as follows...

Alchemy Polymers, LLC is comprised of combat veterans when it comes to battling the elements and saving valuable infrastructures with their polyurethane resins. Contractors can even “sign up” for “boot camp” training to learn the valuable secrets of polyurethane applications from those who have literally been in the trenches. Their winning polymer injection solutions have a highly successful track record for repairing and restoring sea walls, retaining walls, tunnels, bridges, dams, concrete slabs, highways, pipelines, railways, sink holes, homes, buildings, subways and other below ground structures.

You can read more in Jay Davidson's piece Alchemy Polymers, LLC is Winning the Battle to Restore Infrastructures.  Needless to say, we're happy to see Alchemy Polymers featured on SprayFoamInsider.com.

Want additional in-depth info on Alchemy Polymers products and procedures?

Over the past few years, we've published quite a few blog posts on the subject of slab lifting.  In this post, I'm going to highlight a few of our earlier articles covering some of the most common questions people tend to ask on the subject. Contractors who are considering getting into the business often wonder about the strength of polyurethane foam, where to look for lifting jobs, and how to estimate the amount of material they may need for a particular job.  Fortunately, we have thorough blog posts on each of those subjects.  

Slab Jacking with Polyurethane Foam – How Strong is Strong Enough?

When pumping a light-weight material beneath a slab, you need the confidence that it is strong enough for the application. How strong is strong enough? This is a commonly asked question by contractors that are new to slab jacking with polyurethane (poly lifting). Alchemy Polymers structural foams only need to be as strong as dirt, but they're actually stronger than crystalline bedrock.

Slab lifting foams are rated on density (weight per cubic feet) and compressive strength. This testing and rating is based on the foam in a free rise state; the parts A and B are mixed together and allowed to expand freely. Our AP Lift 430 and AP Lift 475 structural lifting foams, for example, will weigh 2.75 – 3.25 lbs (AP Lift 430) to 4.75 – 5 lbs (AP Lift 475) per cubic foot. But they have a compressive strengths of 50 psi and 100 psi in a free rise state. That's equal to 7,200 to14,000 lbs per square ft of support, just in a free rise state.

Read more in the post Slab Jacking With Polyurethane Foam – How Strong is Strong Enough?.

Identifying Common Markets for Slab Jacking with Polyurethane

Three main markets we will take a look at today include Residential, Commercial / Industrial, and Transportation.

The residential market offers tremendous opportunities for the slab lifting contractor. Obviously there are driveways and foundations. These can all sink for various reasons such as water runoff, excess weight, and poor compaction. But look a little further; this year alone we have had calls concerning the following areas: Patios, Outbuildings, Pools, and Porches. And don't think residential only includes houses. I'm not saying that construction companies that build condos and apartments would bury trash that would later cause settling issues; I'm just saying....

Read more in the post Identifying Common Markets for Slab Jacking with Polyurethane.

Estimating Materials for Slab Jacking

Jeff Foxworthy often asks if you are smarter than a fifth grader. Well if you're not, don't worry about it; you're probably still capable of estimating the amount of foam needed to raise a concrete slab. Through a combination of easy calculations, product information, and some site considerations, you should be able to estimate your slab lifting materials without too much trouble.

First of all you need to think about the basic volume calculation. How many square feet of slab are you jacking, how much do you need to lift it, and is it the whole slab being lifted or is it just one end of it? Calculate the volume (length x width x depth), adjust for the percentage of the slab being lifted, then compare it to the expansion properties of the injection foam in order to determine how much you need.

Beyond the geometry required to estimate lifting the slab, you must now take into account some job specific considerations. This is where it becomes critical to qualify the volume of material included in your proposal. And just as important, this is where you need to make sure you have included enough so you get the job done right and don't have to go back to the customer asking for more money. Sometimes that's unavoidable if you encounter surprises; but by keeping a few considerations in mind this can often be avoided.

Read more in the post Estimating Materials for Slab Jacking.

Want more in-depth info on concrete leveling?