Project: Lift, level, and stabilize a concrete slab of approximately 1,730 square feet.
Installer: Purlift Inc.
Engineering Firm: CIMA Plus
Architectural Firm: Rubin Rotman Associés
Challenge
École Boileau faced significant structural issues due to floor settlement in two classrooms and a supply room. The floors had settled by approximately four inches, caused by the decomposition of organic matter beneath the structure. This resulted in a void of about two inches between the slab and the substrate. The challenge was further complicated by the presence of two concrete slabs, one atop the other, with voids between and beneath them.
The uneven floors were particularly problematic for the school's many students who use wheelchairs, making it essential to find a quick and effective solution.
Solution
Findings: The engineering firm CIMA Plus and the architectural firm Rubin Rotman Associés recommended using polyurethane injection, a process installed by Purlift Inc., to address the slab settlement issue.
Process:
Material Used: PolyLEVEL® PL250, a high-density two-part urethane, was chosen for its ability to expand into a rigid, waterproof foam. This material is ideal for filling voids, stabilizing, and lifting concrete slabs.
Properties of PolyLEVEL® PL250:
Compressive Strength: 75 psi
Tensile Strength: 146 psi
Shear Strength: 69 psi
Expansion Rate: 19:1
Density: 6 lbs/cubic foot in place
Additional Benefit: Hydrophobic, meaning it is waterproof and lightweight, preventing additional stress on the already compromised substrate.
Implementation: The concrete slab was drilled every 3 to 5 feet to allow for the injection of the PolyLEVEL® material in its liquid state. This material could infiltrate crevices as small as 1/32 of an inch, filling the voids and lifting the slab to its original level. Throughout the process, the slab's elevation was carefully monitored using laser leveling equipment to ensure precise results.
Results
The project was successfully completed over three days. The injection process filled the voids and stabilized the slab, restoring it to its original position. This solution provided a stable and level floor, significantly improving accessibility for wheelchair-bound students.
Project Summary
Project Engineer: CIMA Plus
Certified PolyLEVEL Installer: Purlift Inc.
Products Installed: PolyLEVEL® PL250, High-Density Polyurethane
Product Characteristics:
Compressive Strength: 75 psi
Tensile Strength: 146 psi
Shear Strength: 69 psi
Expansion Rate: 19:1
In-Place Density: 6 lbs/cubic foot
This case study highlights the effectiveness of polyurethane injection in resolving complex structural issues, providing a safe and accessible environment for all students at École Boileau.
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