Roadware MICRODOWELING Technology Hybrid Urethane Concrete Repair

Roadware MICRODOWELING Technology

Hybrid Urethane Concrete Repair

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

What is MICRODOWELING?

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

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

Surface Tension

• A measurement of the ability of a liquid to overcome its own internal friction and penetrate into a material like concrete.

Surface Tension

• Roadware 10 Minute Concrete Mender™ has a surface tension three times less than water.

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

Viscosity of Concrete Mender

(Time zero = time of ejection from nozzle)

Viscosity of Concrete Mender


Why it Works

• Superior Bond Strength• Ease of Application• Shrinkage• Modulus of Elasticity

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



Why it Works


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

Ease of Application


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.

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

Why it Works


Shrinkage

• International Concrete Repair Institute (ICRI) – Guideline No. 03733

• Shrinkage of 0.05% Is Considered “Low”

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

Shrinkage

Why it Works


Modulus of Elasticity

• 3-point Beam Deflection Test– Tested to Fracture– Nearly Linear Load-Deflection Until

Fracture– Samples Fractured in a Brittle

Manner

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)

Concrete Mender: Summary

• High Quality Bond Achieved• Low Viscosity • Low Surface Tension• Shrinkage Is Low

Concrete Mender: Conclusion

Repairing Cracks With Concrete Mender Largely Restores the Structural Performance of the

Original Concrete


Concrete Mender Job Pics

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.


Roadware 10 Minute Concrete Mender™ is flooded deep into the crack and self-injects into the concrete like water into a sponge.


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.


A core sample of the concrete reveals the level of free penetration of 10 Minute Concrete Mender™ when photographed under filtered UV light.

Job Pics

Crack Repair Movie

QuickTime™ and aSorenson Video 3 decompressorare needed to see this picture.

Job Pics

Crack is Identified Scored and Cleaned out

Mender and Sand is Added

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

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


Hybrid Urethane Concrete Repair

Documents

Roadware MICRODOWELING Technology Hybrid Urethane Concrete Repair