Polyurethane Concrete Leveling - Polyjacking


PROCESS


This work consists of hydraulic pressure pumping a medium under the concrete to correct the concrete profile. Leveling is accomplished by drilling small injection holes and pumping a liquid polyurethane (foam) under the slab. 
 

MATERIALS
Leveling Foam: The leveling foam is a formulation of high-density polyurethane. The high-density, closed cell polyurethane has the following physical characteristics and properties:




Density, Lb/Cu Ft Compressive Strength
(ASTM D1622) (ASTM D1621)
3.0 (48 kg/m3) 40 psi (275 kPa)
3.5 (56 kg/m3) 50 psi (344 kPa)
4.0 (64 kg/m3) 60 psi (413 kPa)
6.0 (96 kg/m3) 110 psi (758 kPa)

The polyurethane foam has a minimum compressive strength of 40 psi (275 kPa). The high-density polyurethane formulation shall reach 90% of full compressive strength within 15 minutes from injection.
 
Polyurethane Concrete Leveling: The high-density polyurethane is injected under the slab. The amount of rise is controlled using the A-Triple-M Contracting, Ltd. pumping unit and by regulating the rate of injection. After the concrete has been raised to the desired profile, all injection holes are grouted with a fast setting sand/cement mixture or other patch material.
 

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