Transcript Civil Engineering

NEO Chemical Seminar 2007
Epoxy Resins for
Civil Engineering Applications
Toine Dinnissen / March 28th 2007
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NEO Chemical Seminar 2007
What is Civil Engineering ????
Concrete Protection and Repair
Floorings
– Self-leveling
– Trowelable
– Decorative Floorings [ Stone Carpets ]
Concrete Repair
– Mortars / Grouting
– Bonding Systems
– Crack Injection
Toine Dinnissen / March 28th 2007
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NEO Chemical Seminar 2007
Why Protect and Repair Concrete ?
• pH of concrete decreases due to acid attack
(CO2 , SO2 , acid rain etc.)
• pH decrease
• Chloride salts
(e.g. de-icing)
• Water
absorption
of concrete
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Corrosion of steel rebars
Frost
Degradation of Concrete
Toine Dinnissen / March 28th 2007
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NEO Chemical Seminar 2007
Desired properties
Protection and repair of concrete
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Toine Dinnissen / March 28th 2007
ambient cure application window
easy to apply
workable pot-life
quick dry to enable to walk on it after 1 day
impact strength
flexural strength
resistance against mechanical stresses
crack bridging properties
ground water protection
chemical resistance
self-leveling and seamless flooring systems
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NEO Chemical Seminar 2007
Features of Epoxy resins for CE
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adjustable curing speed at RT
low sensitivity to moisture during curing
very good adhesion on concrete and “green-concrete”
very low linear shrinkage and corresponding tension
very good chemical resistance
very high durability
BUT
• limited weatherability (UV-light)
Toine Dinnissen / March 28th 2007
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NEO Chemical Seminar 2007
Typical Flooring Composition
• 2 Pack system [ or 3 pack ]
Component A
Component B
Epoxy Resin
Pigments
Quartz sand
Additives
Curing Agent
Pigments
Additives
mix prior to use, pot-life of 30 minutes to 2 hours
• Ambient Cure
Toine Dinnissen / March 28th 2007
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NEO Chemical Seminar 2007
Surface Preparation
Surface must be clean and sound.
All dirt, laitance, grease, curing compounds
and other foreign matter must be removed
by sandblasting, abrasion, or acid etching.
Water and dust must be removed from all
surfaces immediately prior to application.
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NEO Chemical Seminar 2007
Crack Bridging Self-leveling Flooring System
Typical three layer (3 days operation) build-up
Concrete Inspection and Preparation
Finishing Layer
4 mm
– 2700 g/mm2 to 2 mm thickness
– viscosity below 2000 mPa.s
Functional Layer
– 2700 g/m2 to 2 mm thickness
– viscosity below 2000 mPa.s
Concrete Substrate
Impregnation
– 300 - 500 g/m2
– viscosity below 500 mPa.s
– cover with 1000 g/m2 Quartz-sand 0.2 - 0.7 mm
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NEO Chemical Seminar 2007
Dow Epoxy resins for Civil Engineering
• D.E.R.™ 331™ / D.E.R. 336 Epoxy Resin
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Liquid Bisphenol-A based Epoxy Resin
• D.E.R. 354 Epoxy Resin
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Liquid Bisphenol-F based Epoxy Resin
• D.E.R. 352 / D.E.R. 356 Epoxy Resin
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Liquid Bisphenol-A/F Epoxy Resin
{ to prevent crystallization }
• Reactive Diluent Blends
{ reduced viscosity }
D.E.R. 321 / D.E.R. 324 Epoxy Resin
– Bisphenol-A type
D.E.R. 353 / D.E.R. 358 Epoxy Resin
– Bisphenol-A/F type
• D.E.R. 671-X75 and 684-EK40 Epoxy Resin Solutions
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Toine Dinnissen / March 28th 2007
Primer - Surface Impregnation
™ Trademark of The Dow Chemical Company
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NEO Chemical Seminar 2007
Self-leveling Flooring System
Typical formulation:
Binder [ % ]
40
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25.2
35.2
22.5
1.7
0.4
D.E.R.™324 Liquid Epoxy Resin
Quartz-sand [ 0.1 - 0.3 mm ]
Quartz-powder [ < 0.06 mm ]
Titanium-dioxide [ Color ]
Air-release agent
– e.g. BYK A-525
• Amine - Epoxy Adduct Curing Agent15.1
(e.g. Polypox H 043 ex. UPPC )
Compressive Strength
Flexural Strength
Tensile Strength
= 50 N/mm2
= 60 N/mm2
= 43 N/mm2
{Concrete}
{ 40 }
{4}
{2}
STRONGER THAN CONCRETE !!!
Toine Dinnissen / March 28th 2007
™ Trademark of The Dow Chemical Company
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NEO Chemical Seminar 2007
D.E.R.™ 324 Liquid Epoxy Resin
Toine Dinnissen / March 28th 2007
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NEO Chemical Seminar 2007
Regulatory Trends
• ground water protection
» secondary containment
• VOC reduction and regulation
• elimination of aromatic amines
• use of safer reactive diluents
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NEO Chemical Seminar 2007
Technology Trends
– lower temperature cure
» curing down to, below, 0 °C
» mainly driven by curing agent
– lower viscosity { Bisphenol-A/F and RD blends }
» 500 - 6000 mPa.s @ 25 °C
– aqueous systems
» coatings on concrete
» polymer concrete
» Epoxy Cement Concrete
– flexible epoxy resins
» 50 - 200 % Elongation
» crack-bridging concrete
– non crystallizing Resins
» stable on filler addition
» winter time outside storage stable
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NEO Chemical Seminar 2007
End of the Civil Engineering Part !!!
Further Technical as well as Product Stewardship related information can be
found on www.Dowepoxy.com.
e.g.
Dow Epoxy Products Portfolio incl. Corresponding technical datasheets,
Dow Liquid Epoxy Resin Brochure
Dow Epoxy Novolac Brochure
Dow Epoxy Resin Product Stewardship Manual
Dow Epoxy Curing Agents Product Stewardship Manual
Toine Dinnissen / March 28th 2007
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