roadware microdoweling technology hybrid urethane concrete repair
TRANSCRIPT
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Roadware MICRODOWELING Technology
Hybrid Urethane Concrete Repair
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Roadware History
• Established 1991 in Minnesota• Instrumental in Providing
Performance Based High-speed Concrete Repair Products
• Corporately Over 50 Years Product Development and Field Application In: – Highway– Industrial– Commercial
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What is MICRODOWELING?
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Technical Data Summary
• Hardness @ 72F 72D• Compressive Strength (w/sand)
4500psi• Elongation: 6%• Tensil Strength
4475psi• Bond Strength, Cal-551
1100psi• Viscosity (at application) 9 cps• V.O.C. (Mixed): 5.5 g/l• Solids: 98%• Cured Color (not exposed to sunlight) Gray
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Technical Data Summary
• Hardness @ 72F 72D• Compressive Strength (w/sand)
4500psi• Elongation: 6%• Tensil Strength
4475psi• Bond Strength, Cal-551
1100psi• Viscosity (at application) 9 cps• V.O.C. (Mixed): 5.5 g/l• Solids: 98%• Cured Color (not exposed to sunlight) Gray
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Surface Tension
• A measurement of the ability of a liquid to overcome its own internal friction and penetrate into a material like concrete.
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Surface Tension
• Roadware 10 Minute Concrete Mender™ has a surface tension three times less than water.
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Surface Tension
Fluid Surface Tension (N/m)Water at 20°C 0.0729
Ethanol 0.0223
Benzene 0.0289
Glycerin 0.0634
Mender Part A 0.026
Mender Part B 0.026
Mender 30-40 sec after mixing 0.026
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Viscosity of Concrete Mender
(Time zero = time of ejection from nozzle)
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Viscosity of Concrete Mender
(Time zero = time of ejection from nozzle)
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Why it Works
• Superior Bond Strength• Ease of Application• Shrinkage• Modulus of Elasticity
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Superior Bond Strength
• Mechanical Interlock with Microstructure of the Substrate– Measured with Scanning Electron
Microscope•Concrete Beam Fractured•Realigned with 1/8” Gap•Mender Applied•Specimen Was Sawed to Isolate Small
Samples
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Superior Bond Strength
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Superior Bond Strength
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Why it Works
• Superior Bond Strength• Ease of Application• Shrinkage• Modulus of Elasticity
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Ease of Application
• Viscosity– Related to The Ease of Which
Individual Molecules of the Liquid Can Move With Respect to Each Other
– Measured As a Function of Time•Brookfield Viscometer
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Ease of Application
(Time zero = time of ejection from nozzle)
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Ease of Application
• Concrete Mender Easily Wetted the Surface of Concrete– Mender Is Drawn Into the Concrete
Pore Structure by Capillary Tension
– Significant Penetration Occurs Within Minutes of Contact.
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Ease of Application
Liquid Viscosity at 25C (cP)
Methanol 0.55
Benzene 0.65
Water 1.0
Ethanol 1.2
Concrete Mender 9.0
Ethylene Glycol 16
Glycerin 1490
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Why it Works
• Superior Bond Strength• Ease of Application• Shrinkage• Modulus of Elasticity
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Shrinkage
• International Concrete Repair Institute (ICRI) – Guideline No. 03733
• Shrinkage of 0.05% Is Considered “Low”
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Shrinkage
• 0.10% Between 1 Hour and 7 Days • 0.05% Between 2 Hours and 7 Days
Test Was Completed Without SandAdding Sand Will Proportionately
Reduce Overall Shrinkage
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Shrinkage
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Why it Works
• Superior Bond Strength• Ease of Application• Shrinkage• Modulus of Elasticity
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Modulus of Elasticity
• 3-point Beam Deflection Test– Tested to Fracture– Nearly Linear Load-Deflection Until
Fracture– Samples Fractured in a Brittle
Manner
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Modulus of Elasticity
SampleModulus of Elasticitypsi (Mpa)
Modulus of Rupture psi (Mpa)
Neat Concrete Mender 137,000 (944) 3450 (23.8)
Concrete Mender w/ sand (54% vol% sand)
739,000 (5100) 3990 (27.5)
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Concrete Mender: Summary
• High Quality Bond Achieved• Low Viscosity • Low Surface Tension• Shrinkage Is Low
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Concrete Mender: Conclusion
Repairing Cracks With Concrete Mender Largely Restores the Structural Performance of the
Original Concrete
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Roadware MICRODOWELING Technology
Concrete Mender Job Pics
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Repairs - Parking Decks
Cracks in parking structures and bridge decks can be repaired without destructive cutting and grinding. Only a light scoring with a diamond blade grinder is used to clean out the crack. A wire wheel grinder will work too.
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Repairs - Parking Decks
Roadware 10 Minute Concrete Mender™ is flooded deep into the crack and self-injects into the concrete like water into a sponge.
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Repairs - Parking Decks
Roadware 10 Minute Concrete Mender™ is flooded deep into the crack and self-injects into the concrete like water into a sponge.Silica sand is added to the surface and excess material is wiped away with a trowel or even a piece of cardboard. The brushed finish is retained. The repair is fully traffic ready in 10 minutes.
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Repairs - Parking Decks
A core sample of the concrete reveals the level of free penetration of 10 Minute Concrete Mender™ when photographed under filtered UV light.
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Job Pics
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Crack Repair Movie
QuickTime™ and aSorenson Video 3 decompressorare needed to see this picture.
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Job Pics
Crack is Identified Scored and Cleaned out
Mender and Sand is Added
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Job Pics
Crack Being Repaired at Full Depth, Sand Is Added to Stop
Sinkers
Additional Material Is Added to Fill the
Crack Up
Excess Material is Troweled and
Scraped
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Job Pics
After 10 Min. The concrete is ready. A grinding stone is used to blend the
repair
Mender Blender can be added to
cover the repaired slab
Completed Repair
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Roadware MICRODOWELING Technology
Hybrid Urethane Concrete Repair