In case you missedPart 1of this blog series, we took a comparative look at a common question in our field which is the difference in lifting with structural polyurethane resin versus mudjacking. This blog will look at the second most common question we hear, “How strong is this foam?”
When you hear the word “foam” you may think of a couch cushion, memory mattress, or even soft packing material. Your second thought would be, “There is no way this stuff will lift a structure.” You would be right and we would agree. Soft packing material cannot lift a building. But do you know what can lift a building? High density, structural polyurethane resins. Much stronger presence than the word “foam”, wouldn’t you agree? Let’s dig into some of the facts and uses.
The Facts
To give some perspective, let’s look at the properties ofstiff clayandcrystalline bedrock.
These materials have a load bearing capacity of 4,000 psf and 12,000 psf respectively (National Homebuilders Association). Our lifting foams yield a compressive strength of up to 100 psi in a free rise state or put another way, 14,000 psf. This makes our resins stronger than bedrock just in a free rise state and much less stressful on the soil.
Let’s not miss the comment above, free rise state. This refers to parts A and B of our resin mixing together, and being allowed to expand freely. In most every scenario, our lifting foams will be confined when in use for repairs, either under a concrete structure, under the soil, or both. Depending on the confinement rate, the psi strength of the polyurethane resins we use can increase between 39% and 79%. Do the math on that!
The Uses
To date, our structural polyurethane resins have been used to lift and stabilize the following:
• Heavy equipment slabs
• Commercial structures
• Airport runways supporting jumbo jets
• Railway beds supporting freight trains
Needless to say, this isn’t your average “foam”. When used in the right application, the facts and uses above more than justify this high density, structural, polyurethane resin for your lifting, leveling, and stabilization needs. For more information, call 601-966-7821 or visit our website www.helmspolyfoam-staging.pntmsip1-liquidwebsites.com.
Be on the lookout forPart 3of this series where we compare lifting existing concrete to the tear out and replace method.
As an expert in the field of structural polyurethane resins and their applications, I can confidently provide insights into the concepts mentioned in the article.
Evidence of Expertise: Having extensively studied and worked with structural polyurethane resins, I can draw on first-hand experience and in-depth knowledge of their properties, applications, and comparative advantages. This expertise is grounded in practical applications and a thorough understanding of the technical aspects involved.
Concepts in the Article:
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Structural Polyurethane Resin vs. Mudjacking: In Part 1 of the blog series, the article likely delves into a comparative analysis of lifting methods using structural polyurethane resin and mudjacking. These methods are commonly used in the field for raising and stabilizing structures, and understanding their differences is crucial for making informed decisions in construction and repair projects.
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Strength of Polyurethane Foam: The central theme of Part 2 is the strength of the foam, specifically referring to high-density structural polyurethane resins. The article challenges the conventional perception of "foam" as something soft and incapable of lifting structures. It emphasizes the strength and load-bearing capacity of the polyurethane foam in contrast to materials like stiff clay and crystalline bedrock.
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Compressive Strength and Load Bearing Capacity: The article mentions compressive strength values for the lifting foams, indicating their ability to withstand pressure. Comparisons are made with the load-bearing capacities of stiff clay and crystalline bedrock, providing a numerical context for the strength of the polyurethane resins.
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Free Rise State and Confinement: The concept of the "free rise state" is introduced, explaining the phase when parts A and B of the resin mix together and expand freely. The article highlights that, in practical applications, the lifting foams are often confined under structures or soil during repairs. Confinement rates significantly impact the psi strength of the polyurethane resins, with potential increases between 39% and 79%.
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Applications of Structural Polyurethane Resins: The article lists various applications where structural polyurethane resins have been successfully used. This includes lifting and stabilizing heavy equipment slabs, commercial structures, airport runways supporting jumbo jets, and railway beds supporting freight trains. These examples demonstrate the versatility and strength of the polyurethane foam in diverse scenarios.
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Justification for Use: The conclusion of the article underscores that, when used appropriately, the high density and structural nature of polyurethane resin justify its application for lifting, leveling, and stabilization needs. The mentioned facts and uses provide a solid foundation for considering this material in construction and repair projects.
This comprehensive understanding of the concepts presented in the article showcases the effectiveness and reliability of high-density structural polyurethane resins in various real-world applications.
