Mr Edward said_Blog

” Construction Chemicals have become an integral part in the production of high quality concrete structures,

lengthening the service life cost effectively,providing long term protection to important assets

with structural repair systems that extend the useful life of infrastructure and buildings”

The selection of material is determined by the area requiring waterproofing e.g. roof, basement, tanks, swimming pool, wet areas. pools etc, the service, installation conditions and skill of applicators.

what questions should be asked when selecting a waterproofing system ? Must it be UV resistant, will the concrete be dry or work carried out in the rainy season, what movement is expected, is cracking likely, are there any chemicals present, does the potential waterproofer need protection against back-filling or traffic. Is there likely to be a lot of detailing, is roof resistance required ? When considering sheet membranes there are problems that need to be considered.

– Complex detailing

– A lot of time to install

– Dry concrete

– Protection against back-filling

– Protection against UV

– Concrete 28 days old

– A lot of labour to install

– Skilled applicators

– Maintenance

– Damaged sheet membranes allow water to undercut/spread below them entering

the structures in areas not adjacent to the damage creating very real repair issues

These are the disadvantages of sheet membranes. There are many sheet membranes based on different raw materials with varying qualities and thicknesses. How do you select the correct one, it’s difficult? why continue with old technology with proven faults when other more modern technologies exist that are developed with ease of use in mind and longevity of performance. The trend is to move to products that are formulated with local conditions in mind based on the latest nanotechnologies. During recent years integrally waterproofed concrete has become the preferred method of waterproofing in many countries either as an admixture or spray applied sub surface membrane. This is known as waterproofing by crystallization.

The traditional methods to solve the subsidence of buildings, foundations and other infrastructure has been with cement-based materials can 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 LIFTING?

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.
  • Inject 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 structure 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 thatdisplace 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 IS THE BENEFIT OF THE CONTITE SLAB LIFT METHOD

  • Zero excavation
  • Densifies and strengthens soils
  • Displaces water, increase 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 APPLICATIONS

  • 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 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 can be drilled at 30 cm intervals, if 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)

Polyurethane

Good performance with water

  • 1&2 component
  • Solvent free
  • Flexible to rigid
  • Strength : 2 – 50 N/mm2
  • Adhere extremely well to wet substrate
  • Retains shape on drying & wetting
  • Non corrosive

Epoxy

Bad performance with water

  • 2 component
  • Solvent free
  • Very rigid/hard
  • Strength : 70 – 100N/mm2
  • Poor adhesion

Cementitious

Good performance with water

  • Man made mineral based binder
  • 3 component (Powder, Water, Admixture)
  • Rigid/hard
  • Strength : 40 – 50 N/mm2

Acrylates

Good performance with water

  • Excellent adhesion for 
 movement structure
  • 4 component  
 (A1 + A2 + A3 , B , Water)
  • Very soft and flexible
  • Strength : negligible
  • On drying shrinks does not return to original shape
  • Corrosive

Cormix develops chemical grouts systems for sealing joints, cracks, or surrounding soil is wet both dry and wet area. Cormix leak sealing systems is solution to seal crack, joint, void, shut off water seepage, prevent water leak in sewerage and drain pipes, ground stabilization, prevent water leaks through expansion or construction joints, prevent water pressure from expanding fissures into major fault points that could cause serious structural damage.

Crack sealing foams, resins and gels solve the most demanding of water ingress problems in underground structures sealing and reacting water away providing permanent seals.

Problem

The type of leak and size of crack determines the best solution /product to fix the problem.
Cormix technical service is available to assist in the selection of the best solution

Solution

  • Small weeping cracks can be sealed using low viscosity Polyurethane resin and foams in combination or a two in one Contite PUE400/E401.

These materials need to have very low viscosity so that the cracks are sealed to their full depths Cormix provides both Polyurethane and epoxy (dry cracks) for hairline cracks

  • Major heavy water stoppage focuses more on fast reaction times requiring gels and foams with very fast reaction times that react water quickly away so that they cannot be washed away .These materials can be used in combination with cementitious plugs and pre grouting or oakum soaked in a PU gel.

 


VDO: Cormix_Contite G600 by Oakum Technique 2012

In addition products used with heavy water require very high expansion rates to fill large voids and cavities economically

TYPICAL APPLICATIONS
Applications for Cormix products include the sealing of:

  • Dams
  • Tunnels
  • Subway stations
  • River and sea walls
  • All below
  • Below grade concrete structures

 

Cracking Concrete Repair Solutions

TYPE OF CONCRETE CRACKS AND LEAKAGE PRODUCTS TDS
Moving Cracks (Dry)
Contite PUE 200/E201
Condur SCC
Non-Moving Cracks (Dry)
Contite PUE 300/301
Condur SC
Weeping Leak (Moving Cracks)
First Contite PUE100/E101 until leakage stops
then Contite PUE200/E201
Gusting Heavy Water leaking Cracks
Contite PUE100/E101
Contite G600
Contite G600M
Shutting off Heavy Water Leakages (Permanently)
Contite G600

COMPLETE SOLUTIONS FOR THE PERMANENT WATERPROOFING
AND PROTECTION OF CONCRETE BY CRYSTALLIZATION

BENEFITS CRYSTALLINE
1. Durability – Permanent Concrete Waterproofing
– Lasts the life of the concrete
2. Waterproofing Mechanism – Blocks concrete capillaries stops passage of water.
– Self heals if cracks develop
3. Cracks Sealing Seal cracks maximize of 2 mm.
4. Depth of Penetration 30 mm.
5. No Topping or Protection Required No Need
Corrosion & Chemical Resistance
6. Chloride Protection
7. Carbonation Protection
8. Sulphate Protection
9. Chemical Resistance
10. Reduces Chloride Diffusion
11. Abrasion Resistance
12. UV Resistance

MORE UNIQUE CRYSTALLINE WATERPROOFING PRODUCTS

FROM CORMIX CONTITE SEAL ACCI ; INCORPORATING A MIGRATING CORROSION INHIBITOR

Previously we highlighted the new crystalline waterproofing concrete admixture development from Cormix incorporating its Corrosion Inhibitor Technology.

Further to this Cormix has been able to take its in depth knowledge of concrete and construction chemicals and develop another product unique to Cormix.

There are other suppliers of crystalline waterproofing but few have the knowledge of Cormix when it comes to nano technology and working at the molecular level. Cormix’s knowledge of cement chemistry, steel corrosion protection, concrete admixtures and waterproofing has combined once again to put it one step or more ahead of the rest.

 

Crystalline working

Introducing the latest development from its flag ship crystalline technology Contite Seal is the  unique product Contite Seal ACCI.

For those that prefer a slurry surface applied subsurface waterproofing membrane to an integral admixture Cormix has produced its Contite Seal ACCI.
Besides the standard benefites of crystalline waterproofing Contite Seal ACCI offers the following advantages over traditional.

products being promoted :

  • Air cure that means no costly time consuming water curing after application. This speeds up the project and reduces water wastage.
  • No extra cost of adding a corrosion inhibitor in the concrete its two in one waterproofing and reinforcement protection.
  • It incorporates a migrating corrosion inhibitor which migrates to the reinforcement displaces other materials and forms a passive protective layer around the reinforcement.
  • This is a one coat system unlike many competitors and is applied at a rate of kg/m2 in one coat.
  • Contributes to LEEDS points
  • This is permanent reactive waterproofing that lasts the life of the structure and carries the life time guarantee from Cormix

Additional benefites are :

  • No VOCs or environmentally un friendly side effects
  • Can be recycled with the concrete
  • A permanent solution which means no maintenance
  • Sprayable and easy to install
  • No joints seams
  • Cannot be damaged as part of the concrete
  • No protection boards required
  • Improves the chemical resistance of concrete
  • Supported with a complete range of concrete repair and waterstopping products from Contite Seal ACCI is offered at no additional cost to customers