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Toine Dinnissen / March 28th 2007 Page 1 NEO Chemical Seminar 2007 Epoxy Resins for Civil Engineering Applications
Toine Dinnissen / March 28th 2007 Page 1
NEO Chemical Seminar 2007
Epoxy Resins for
Civil Engineering Applications
Toine Dinnissen / March 28th 2007 Page 2
NEO Chemical Seminar 2007
What is Civil Engineering ????
Floorings– Self-leveling
– Trowelable
– Decorative Floorings [ Stone Carpets ]
Concrete Repair– Mortars / Grouting
– Bonding Systems
– Crack Injection
Concrete Protection and Repair
Toine Dinnissen / March 28th 2007 Page 3
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)
Corrosion of steel rebars
• Water absorptionof concrete
Frost
Degradation of Concrete
Toine Dinnissen / March 28th 2007 Page 4
NEO Chemical Seminar 2007
Desired properties
Protection and repair of concrete
• 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
Toine Dinnissen / March 28th 2007 Page 5
NEO Chemical Seminar 2007
Features of Epoxy resins for CE
• 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 Page 6
NEO Chemical Seminar 2007
Typical Flooring Composition
• 2 Pack system [ or 3 pack ]
Component A Component B
Epoxy Resin Curing Agent
Pigments Pigments
Quartz sand
Additives Additives
mix prior to use, pot-life of 30 minutes to 2 hours
• Ambient Cure
Toine Dinnissen / March 28th 2007 Page 7
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.
Toine Dinnissen / March 28th 2007 Page 8
NEO Chemical Seminar 2007
Crack Bridging Self-leveling Flooring System
Typical three layer (3 days operation) build-up
Concrete Substrate
4 mm
Concrete Inspection and Preparation
Impregnation– 300 - 500 g/m2
– viscosity below 500 mPa.s
– cover with 1000 g/m2 Quartz-sand 0.2 - 0.7 mm
Functional Layer– 2700 g/m2 to 2 mm thickness
– viscosity below 2000 mPa.s
Finishing Layer– 2700 g/mm2 to 2 mm thickness
– viscosity below 2000 mPa.s
Toine Dinnissen / March 28th 2007 Page 9
NEO Chemical Seminar 2007
Dow Epoxy resins for Civil Engineering
• D.E.R.™ 331™ / D.E.R. 336 Epoxy Resin
– Liquid Bisphenol-A based Epoxy Resin
• D.E.R. 354 Epoxy Resin– Liquid Bisphenol-F based Epoxy Resin
• D.E.R. 352 / D.E.R. 356 Epoxy Resin– 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
™ Trademark of The Dow Chemical Company
• D.E.R. 671-X75 and 684-EK40 Epoxy Resin Solutions
– Primer - Surface Impregnation
Toine Dinnissen / March 28th 2007 Page 10
NEO Chemical Seminar 2007
Self-leveling Flooring System
Typical formulation:Binder [ % ] 40
• D.E.R.™324 Liquid Epoxy Resin 25.2• Quartz-sand [ 0.1 - 0.3 mm ] 35.2• Quartz-powder [ < 0.06 mm ] 22.5• Titanium-dioxide [ Color ] 1.7• Air-release agent 0.4
– e.g. BYK A-525
• Amine - Epoxy Adduct Curing Agent 15.1(e.g. Polypox H 043 ex. UPPC )
™ Trademark of The Dow Chemical Company
{Concrete}Compressive Strength = 50 N/mm2 { 40 }Flexural Strength = 60 N/mm2 { 4 }Tensile Strength = 43 N/mm2 { 2 }
STRONGER THAN CONCRETE !!!
Toine Dinnissen / March 28th 2007 Page 11
NEO Chemical Seminar 2007
D.E.R.™ 324 Liquid Epoxy Resin
Toine Dinnissen / March 28th 2007 Page 12
NEO Chemical Seminar 2007
Regulatory Trends
• ground water protection» secondary containment
• VOC reduction and regulation
• elimination of aromatic amines
• use of safer reactive diluents
Toine Dinnissen / March 28th 2007 Page 13
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
Toine Dinnissen / March 28th 2007 Page 14
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 BrochureDow Epoxy Resin Product Stewardship Manual
Dow Epoxy Curing Agents Product Stewardship Manual
