Concrete Surface Preparation - Turbo Liner Of Polyurea... · What is Surface Preparation? ... ACI...
Transcript of Concrete Surface Preparation - Turbo Liner Of Polyurea... · What is Surface Preparation? ... ACI...
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Concrete Surface Preparation
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The MOST Important Factor for the Success of Coating and Lining Installations
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What is Surface Preparation?Mechanically or chemically preparing a substrate to an acceptable industry standard prior to the application of a coating or lining system to the substrate.
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The Inspection ProcessDetermine project objectives & requirements
Establish performance priorities
Evaluate surface preparation methods
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Concrete Conditions
Concrete cured to sufficient strength
Surface color, hardness, & continuity
Moisture vapor emissions
Cracking type and severity
Joint layout and design
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Discoloration & Stains
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Blisters
surface finished too soon
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Dusting
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Chemical attack
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Crazing cracks
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Shrinkage cracks
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Scaling
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Spalling
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Spalling
corrosion of steel, lack of cover
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Spalling
corrosion of steel
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Industry Standards
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Industry Associations
American Concrete Institute (ACI). American Society for Testing Materials (ASTM).International Concrete Repair Institute (ICRI).The Society for Protective Coating (SSPC)National Association of Corrosion Engineers (NACE)
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American Concrete Institute
Website: www.concrete.orgPhone: (248)848-3700ACI 350-01 Code Requirements for Environmental Engineering Concrete StructuresACI 302.1 Guide for Concrete Floor and Slab Construction
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American Society for Testing Materials
Website: www.astm.orgPhone: (610) 832-9530ASTM D4258 Cleaning ConcreteASTM D4259 Abrading ConcreteASTM F1869 Measuring Moisture Vapor Emission Rate of Concrete
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International Concrete Repair Institute
Website: www.icri.orgPhone: (847) 827-0830Technical Guideline 03732 Surface PrepTG 03731 Selecting Application MethodsTG 03733 Selecting Materials for Repair
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The Society for Protective Coatings
Website: www.sspc.orgPhone: (412) 281-2331NACE 6/SSPC SP-13 Surface Prep of Concrete
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National Association of Corrosion Engineers
Website: www.nace.orgPhone: (281) 228-6200NACE 6/SSPC SP-13 Surface Prep of Concrete
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ICRI Technical Guideline No. 03732
“Selecting and Specifying Concrete Surface Preparation for Sealers, Coatings, and Polymer Overlays.”
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Coating Requirements For Concrete Surface Profile (CSP)
CSP 4-6Self-Leveling(50 mils- 1/8”)
CSP 5-9Polymer Overlay(1/8” –1/4”)
CSP 3-5High Build (10-40 mils)
CSP 1-3Thin-Film (4-10 mils)
CSP 1-3Sealers (0-3 mils)
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Types of Surface Preparation
Detergent ScrubbingLow-Pressure Water CleaningGrindingAbrasive (Sand) BlastingSteel ShotblastingScarifying
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CSP-1Detergent Scrubbing
No change in surface profile
Low Pressure Water Cleaning <5,000 psi
Slight change in surface profile
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CSP 1 - 3 Grinding
Produces Smooth SurfaceCan Remove Rigid CoatingsVarious Discs
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CSP 2 - 5Abrasive (Sand) Blasting
Wide profile rangeRemoves resilient or rigid coatingsRequires Containment and Clean-upNoise levels = > 85 dB
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CSP 3 - 8
Steel Shotblasting
Cleans & Profiles
Coating Removal varies with thickness and resin
Shot varies Profile
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Steel Shotblasting
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Steel Shotblasting
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CSP 4 - 9Scarifying
Medium to Heavy Profile Remove Toppings (<1/8”)Will “Bruise” Concrete
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Scarifier
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CSP 7 - 9Scabbling
Removes Coatings and Toppings (1/4”)Heavy Profile Will “Bruise” ConcreteDust and Debris
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BRUISING
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CSP 6 - 9High Pressure Water Jetting
15,000 to 45,000 psi waterCan remove in excess of ¼” of surface
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What tests can be done to assure proper surface preparation is complete?
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Visual Test – Compare area to set industry standards, i.e. ICRI Surface Profile Chips.Water Absorption Test – Verify surface is open porous.Moisture Vapor Transmission – Calcium Chloride
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Testing for Moisture Vapor Emission from concrete
ASTM F 1869 –Standard Test Method for Measuring Moisture Vapor Emission Rate of Concrete Using Anhydrous Calcium Chloride Moisture Emissions TestVaprecision 1-800-449-6194www.vaportest.com
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Adhesion Testing
ASTM D 4541 (tensile adhesion)Location of detachment recorded as:
Adhesion breakCohesion breakGlue failure
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Chemical Contamination Tests
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CSP Summary
Clean SurfaceAbrasive Blast or Shot blastCheck for MoistureCheck for Chemical ContaminantsRepair as Required
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GOOD Surface Preparation?
Defined as the process by which sound, clean and properly profiled surfaces are produced on concrete substratesDoes not damage the surface to be toppedDoes not damage or loosen the reinforcing steel
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BAD Surface Preparation !
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Final Thought
The more attention you pay to concrete surface preparation requirements the more successful you will be in long term performance of polyurea systems.
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Questions?
Thank you!