Slab Lifting Technology

The traditional methods to solve the subsidence of buildings, foundations and other infrastructure has been with cement-based materials which lead to varying results and may not solve the root cause, finally the problem can re-occur. Cormix supplies a range of solutions for soil stabilization and slab lifting based on the latest polyurethane technology.

WHAT IS CORMIX SLAB LIFT

Slab lifting is the process whereby sunken concrete slabs or structures are lifted back to level with precision. Traditional methods use cement grouts (Slab Jacking) with varying degrees of success often resulting in less than accurate lifts, considerable disruption, mess and longer term failures.

Today the alternative is lifting slabs or structures with rigid, high strength structural, non-shrink, non-disruptive, lightweight, environmentally friendly polyurethane foams Contite Slab Lift in combination with other polyurethane foams and gels used to grout various soil conditions stabilizing the soil.

Changing soil conditions via such processes as erosion, ground water movement, water extraction, decomposition and freeze thaw may lead to foundation damage or failure. Cormix provides a range of soil stabilization solutions to inject into the soil strengthening and binding it to provide a watertight solid base.

The types of grouting/injection can be divided into a number of main areas:

ADVANTAGE OF SLAB LIFTING

  • No mess
  • No shrinkage
  • Long term stable
  • Quick and non disruptive to working environment
  • Stabilizes surrounding soils
  • Stops washout
  • Environmentally friendly
  • High strength not brittle

COMPARISON WITH MUD JACKING

Cormix chemical grouting systems provide many advantages over cement based mud jacking. Below are some of the advantages:

  • Very fast and non-disruptive
  • Clean
  • Non invasive
  • Limited damage and disruption
  • Less weight
  • Permanent results
  • Lower cost
  • No environmental impact

CONTITE SLAB LIFT

Cormix rigid, high strength, non shrink fast reacting technology ensures a permanent, rapid, clean solution to slab lifting and soil stabilization Contite Slab Lift ensures a permanent precision lift with high strength rigid foam.

WHAT IT IS AND DOES?

  • A polyurethane structural foam.
  • Injected expanding polymer.
  • Deep Injection through tubes up to 8 m deep.
  • Constantly monitored.
  • Compacts weak soil zones.
  • Voids are filled.
  • Lifts & realigns.
  • Base soil strengthened.
  • Restores load bearing capacity.
  • High Density hydro polymer.

HOW DOES CONTITE SLAB LIFT WORK?

  • Contite Slab Lift is a two component structural polyurethane foam for concrete slab lifting and soil stabilisation.
  • Contite Slab Lift may be used for concrete slab lifting & soil stabilization by improving load bearing capacity of loose soils, filling of large voids, cracks and crevices.
  • Contite Slab Lift is injected into the ground to the required depth restoring load bearing capacity, densifying and strengthening soils with rigid high strength foams that displace or react away water, compacting soil before finally lifting the structure or pavement back to alignment on a sound base.

CORMIX SLAB LIFTING IS LONG TERM SOLUTION

Cormix soil stabilization and slab lifting grouts provide long term solutions and advantages that are controlled these include:

  • Soil compaction and stabilization.
  • Control or stopping of water movement
  • Large void and cavity filling with rigid foam
  • Slab lifting to tight tolerances

WHAT ARE THE BENEFITES OF THE CONTITE SLAB LIFT METHOD

  • Zero excavation
  • Densifies and strengthens soils
  • Displaces water, increases soil density
  • Environmentally friendly
  • Non-destructive – lower time, Less noise
  • Keeps important assets in service, minimal interruption of operations
  • Fast reaction, high strength for loads
  • Water movement halted
  • Enhances underground structures
  • Stabilizing & sealing operation in one

TYPICAL AREAS OF APPLICATIONS INCLUDE : –

  • Warehouse / Distribution Center / Depot / Container Terminal
  • Heavy equipment foundation, factory floor
  • Highway Pavement
  • Bridge Approach
  • Taxiway / Runway
  • Railway Foundation
  • Sealing Manholes
  • Sea walls
  • Silo

STEP APPLICATION: Slab Lifting

Resin injection method used to lift sunken concrete slab to the original level.

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After stabilization of the sub base with for example Contite PUE500/501 high strength rigid foam Contite Slab Lift Polyurethane is injected through drilled holes to fill voids underneath the slab or footings and lift the slab.
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Contite Slab Lift expands exerting pressure to the slab.
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The lifting of Contite Slab Lift is carefully monitored by laser level.
After completion, the treated area is trafficable within 15 minutes.

SLAB LIFT: METHOD

  • Drill a hole in the sunken slab (or) soil / ground surface & fix packer. Multiple holes are be drilled at 30 cm intervals, When the surface area of sunken slab is large.
  • Connect the injection head to the packer.
  • Open valves for Part A and Part B and start the injection.
  • The injection should be continued until the water flow stops, slab is lifted sufficiently or until the premeasured amount of product has been injected in each packer.
  • Close the valve and disconnect the packers from the mixing head.
  • Continue and repeat the injection steps with adjacent packer.
  • When the injection has finished, clean and rinse all equipment with Contite PU Purge.
Recommended equipment: A two component injection machine such as GRACO REACTOR E-30 (plural component proportioner) with 1:1 mix ratio is recommended to use where two hoses are connected with an injection gun before injecting into the drilled holes.
To prevent any clogging always clean and flush all equipment including the injection gun with Contite PU Purge prior to the injection.

EQUIPMENT FOR SLAB LIFTING

  • Starter Equipment List for Slab Lifting
  • Reactor for Contite Slab Lift (Starter)
  • Reactor for Contite Slab Lift (Advance)
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