repairing concrete with composites final (1)
TRANSCRIPT
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Best Practices Utilizing FRP in Repairing Concrete Infrastructure
RTCONSULTS PLLC
ICRI 2015 FALL CONFERENCE OCTOBER 14-16, 2015
MICHAEL P. [email protected]
NACE COATING INSPECTOR LEVEL 3 #50795
RICHARD TARABORELLI [email protected]
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Table of ContentsThe Main Issues
Lessons Learned from Projects
Surface Preparation Methods
Application Methods
Issues to Correct and Test
Inspection and Quality
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The Main IssuesConcrete degrading from weathering or atmospheric conditions
Chemical attack from containing waste or chemical solutions
Rebar corrosion resulting in concrete spalling
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The Typical Composite
Hand Lay-up Laminate(Ex. Pipe, Tank, Ducting, etc.)
Interior
Corrosion FRP Barrier
Veil andMat layer
Exterior
Substrate: Concrete(Provides the Strength)
Different ratios of resin/glass depending on design
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Coating and Linings
In the realistic world:
Surface Preparation Issues (+50% failures easily)
Ambient Conditions/Application
Wrong specification for environment
50%
20%
30%30%
Failures
Surface Prep. Wrong Spec. Bad Application
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Lessons Learned from ProjectsKnow the environmental conditions
Understand the service conditions and life cycle cost
Maintenance and Inspections
Quality Control
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Surface Preparation Measurements
ICRI concrete pads
Roughness consistency
Moisture testing
Water Sealer and mix design
ICRI CSP 3 (Mech)
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ASTM D 4258- Solvent/Detergent Cleaning
ASTM D 4259- Removing Laitance
ICRI No. 310.1R-2008 Rebar Corrosion Repair
ICRI No. 310.2R-2013 Concrete Surface Prep.
ACI 311.1R Concrete Inspection
ACI 440.2R-08 Externally Bonded FRP Systems
SSPC SP13/ NACE 6 Surface Preparation of Concrete
General Cleaning Requirements
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Application MethodsHand Lay-up with mat and resin
Preformed systems and molds
Wraps and reinforced system layers
Chopped glass with resin (not recommended)
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Issues to Correct and TestFRP’s strength comes from the crosslinking of the resin and also the glass combined with it.
Applying FRP or any coatings on questionable concrete will not have a reliable service life.
Coatings/FRP over existing concrete will likely result in a few localized areas of failures.
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Moisture issues
Surface preparation issues (blast vs mechanical)
Type and quality of concrete issues (4000 psi)
Testing with different profiles on the surface
Lack of knowledge of concrete itself in regard to inspectors
Coating/FRP Adhesion with Concrete
ICRI CSP 5 (Abrasive Blasted)
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Our lab ran seven peel tests and pull off tests on the adhesion of concrete.
Adhesion was seen to go up to a certain surface profile and then back down.
Very difficult to get consistent adhesion to subgrade due to mixture quality.
Surface Preparation Issues
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Instruments Used
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Average DFTs: 123.6 mils, 3 mat (1.5oz) and 2 C- glass veil FRP System
Lab Results
Method of Surface Preparation Adhesion rate (psig) ICRI Standard
Mechanical Abrasion 542 3
Mechanical Abrasion 515 3
Mechanical Abrasion 592 3
Mechanical Abrasion 425 2
Abrasive Blasted 724 4
Abrasive Blasted 700 5
Waterproofing Added on Surface 363 3
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The use of water blocking agents lowered adhesion rate
Abrasive blast is superior to mechanically prepared surfaces in all scenarios
Over numerous moisture cycles, laminate loses adhesion depending on location.
Surface Preparation Lab Results
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Osmotic pressure from water table or source
Expansion joints
Install drainage pipes for water to exit
Reinforcement is required for successful longevity
FRP linings are secondary walls
Modification and Installation
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“You can expect what you inspect- nothing more.”
-John H. Mallinson
You must know what you require and know how to identify it. Quality Inspections are needed.
Let the Results Speak for Themselves
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Issues Affecting Laminate Performance
In the realistic world:
Poor curing (initial)
Diffusion
Applied stress
Embrittlement
Micro-cracking
Swelling
Impact
Environmental cycling
Aging (Time) Lack of Fusion and Poor Fit
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Air Voids Defects
More Issues
Blisters Delamination from Substrate
Dry Spots
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Compliance
Drawings
Design Specifications
Materials (lot numbers)
Ambient Conditions
Standards (ASME RTP-1)
Verify Quality Control
Pass/Fail Criteria
Quality Assurance Through Inspections
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FINAL INSPECTION
Documents Review
Non Conformance
Reports
Cutouts
Resin Cure
Peel Adhesion Test (picture)
Dimensions and thickness
Physical properties
Quality is What Will Last
What 99.5% adhesion looks like : Use Crowbar
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Proper Material Selection for Service
Comprehensive and descriptive specifications
Qualify experienced GRP manufacturer
Know the limitations of the composite
Quality assurance throughout the process
Inspect, Inspect, Inspect…
Lessons Learned Keys to a Successful Project