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Introduction to Polyurethane Foam and Its Properties

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How they raise & level Sunken Concrete with foam 4 k video

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What happens here

The presenter introduces the concept of lifting concrete slabs and filling voids using polyurethane. He explains that polyurethane is a liquid material made of two parts (A and B). When mixed, these parts undergo a chemical reaction, generating heat and causing significant expansion. This expansion is the key mechanism for lifting concrete. A demonstration shows two liquids being mixed, which then rapidly expands into a dense foam within 10 to 15 seconds. This specific foam is described as a '2-pound foam' suitable for residential work, with a PSI (pounds per square inch) of 30, and it 'skins over' quickly, preventing material loss.

Goal: Understand the basics of polyurethane foam and its expansion properties for concrete lifting.

Tools and materials

  • Mixing Beaker/Cup — To mix the two-part polyurethane foam for demonstration
  • Mixing Spatula/Stirrer — To thoroughly mix the polyurethane components
  • Polyurethane Foam — Component of the foam that creates the lifting force

What they say

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today we're going to demonstrate lifting concrete slabs using polyurethane and then we're going to do some void filling before we can start a Jacke polyurethane underneath the slab to lift them you have to understand with everything about polyurethane although this isn't a chemistry class it helps you understand what's going to be happening under the slab polyurethane is really a liquid to liquid part A Part B and put it together you get a chemical reaction that chemical reaction has two effects what is heat and the second is expansion for help you get to help you visualize what's gonna happen under the slab but but if Jesse is going to mix up some of our to count all right here we have multiple phones the Bolton to application this particular foam is ideal for residential would be the to town for his characteristic car it was set up [Music] and we'll end up with a product that's got a psi of 30 now please visualize it gets injected and mixed at the typical gun injected as a liquid underneath the slab the chemical reaction happens and that is what lifts your concrete it is not the force of the injection to be repetitive because under is a liquid spreads out sets up and licks your concrete like the pillow from underneath mitigating the probability of cracking the plan alright guys I was walking

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