1. Municipal Wastewater Infrastructure Rehabilitation

2. Sherwin Williams
Murray Heywood – Water & Wastewater Business Development Manager Eastern North America
34 Years Coating Industry Experience
NACE Level 3 Coating Inspector
SSPC- Protective Coating Specialist
NACE CIP Instructor
MPI- Architectural Coating Specialist
Chair- SSPC Ontario Chapter

3. Learning Objectives
Causes of Deterioration of Concrete in Municipal Infrastructure
Stopping Inflow & Infiltration
Structural Rehabilitation Materials
Chemical Resistant Coatings and Linings

4. Causes of Deterioration
Structural Fatigue
Corrosive Gases
Microbial Induced Corrosion (MIC)
Old Age

5. Causes of Deterioration
Infrastructure Now Reaching Its Intended Life Cycle Of 50 Years
Sewage Has Become More Septic Due to Longer Dwell Times
Poor or Poorly Placed Concrete
More Industrial Waste Entering Stream
Different Organic Components

6. Structural Fatigue Manholes Caused by: Traffic Loading
Freeze/Thaw Cycling
Soil Movement
Erosion or Cavitation

7. Corrosive Gases Hydrogen Sulfide – H2S Corrosive to metal and concrete
Reduces the pH level
Converts to sulfuric acid when it comes in contact with Sulfur Reducing Bacteria (SRB’s)

8. Corrosive Gases Carbon Dioxide Slow deterioration of the substrate
Naturally occurring
Acts to reduce pH of the substrate
Carbonated concrete

9. Microbial Induced Corrosion
Sulfur reducing bacteria (SRB) break down sulfates in the waste stream and produce hydrogen sulfide (H2 S) and carbon dioxide CO2.
The acidic gases H2S and CO2 act to reduce the pH of concrete from approximately 12 to as low as 9.

10. Microbial Induced Corrosion
Sulfur oxidizing bacteria (SOB’s) attach to the surface as sulfates are produced.
The SOB’s are known as Thiobacillus Thioxidans. They consume H2S and discharge sulfuric acid H2SO4
The pH continues to drop and microbial growth accelerates creating more H2SO4
Eventual structural failure

12. Stopping Inflow & Infiltration
Purpose:
Lower the cost of wastewater being treated at the plant.
Lower the cost of equipment maintenance associated with abrasive soils in the waste stream.
Protect the environment for Sanitary Sewer Overflows (SSO’s)

13. Stopping Inflow & Infiltration
Process
Treated through trenchless technology applications
Utilizing polyurethane grout injection
Sherwin Williams Partners with Avanti International for all grouting products

14. Typical Manhole Rehabilitation Program
1- Correct All I&I Issues
2- Determine Level Of Deterioration of Concrete
3- Determine Areas of High H2S
4- Develop a Budget
5- Develop a Rehabilitation Plan

15. Typical Manhole Rehabilitation Program
Rehabilitation Plan
While manholes properly repaired with mortar and properly lined with Epoxy will typically have a 50 year life span not all municipalities have the budget to use a full mortar and lining system for all manholes.
Sherwin Williams Can Help Develop a Manhole Rehabilitation Plan

16. Typical Manhole Rehabilitation Program
Rehabilitation Plan (After All I&I Stopped)
Lift Station/Force Main and next 4-5 Holes- Repair Mortar Lined With 125 mils of Epoxy
Next Consecutive 4-5 Holes - Calcium Aluminate Mortar Lining – ½”-4” Nominal Thickness.
Next Consecutive Holes to Next Lift Station- Microsilica Mortar Lining - ½”-4” Nominal Thickness
Then Re-Start Process at Next Lift Station.
* Approximate Plan Must Be Customized

17. Structural Rehabilitation Materials
Cementitious Repair Mortars
Portland Cement with Admixtures or Calcium Aluminates
Sprayed or trowel applied
New product mixes allow radial spray with no entry into manhole
Will degrade as the original surface did

18. Structural Rehabilitation Materials
Portland Cement
This is the most commonly used cement during the precasting and/or cast-in-place production of today’s wastewater components.
Relatively Inexpensive
Easily Located
Susceptible to MIC
Long cure times before top coating

19. Structural Rehabilitation Materials
Microsilica Repair Mortars
Microsilica repair mortars utilize Portland cement to create the cement paste but also contain a fumed silica admixture to create a more dense substrate.
Chemical Resistant / Lower Permeability
Can be used as a stand-alone liner in a mild H2S environments.
Faster cure times for top coating
Susceptible to MIC
Lower cost than Calcium Aluminate Mortars

20. Structural Rehabilitation Materials
Calcium Aluminate Repair Mortars
The principle behind Calcium Aluminates is that they maintain a higher pH that prevents they colonization of the Thiobacillus bacteria.
Offer an improved life cycle over other repair mortars
Susceptible to MIC but a reduced rate
Can be used as a stand-alone liner in moderate H2S environments.

23. Chemical Resistant Coatings & Linings
Protect the surrounding environment
Provide a longer life cycle for the substrate they are protecting
Provide an excellent infiltration barrier
Available chemistries include:
Epoxy
Polyurethane
Polyurea

24. Chemical Resistant Coatings & Linings
All 3 Chemistries (Epoxy, Polyurethane & Polyurea) have a place in Lining Wastewater Structures and Tanks
Sherwin Williams Has Developed Our Manhole Rehabilitation Program Around Epoxy Technology

25. Manhole Rehabilitation Chemical Resistant Linings
Competitive Manhole Lining Products in the market Include;
Epoxy Technology
Polyurethane Technology
Polyurea Technology
What's The Difference ????

26. Manhole Rehabilitation Chemical Resistant Linings
Polyurethane Products
Require a Primer For SSD Conditions
Isocyanate Will Blister In The Presence of Moisture During Application
Very Poor Bond When Directly Applied To Concrete
Most Products Are Actually Free Floating In the Manhole and Not Physically Attached to Walls
I&I Can Occur Between Lining an Wall and No One Would Know.
Mostly Small to Medium Sized Regional Manufacturers with Protected Territories.

27. Manhole Rehabilitation Chemical Resistant Linings
Polyurea Products
Require a Primer For SSD Conditions
Isocyanate Will Blister In The Presence of Moisture During Application
Very Poor Bond When Directly Applied To Concrete
Often Applied Over Foam Which Has Little To No Structural Integrity.
Application Equipment Very Bulky
Surface Preparation Must Be Perfect for Success.
Mostly Small to Medium Sized Regional Manufacturers with Protected Territories.

28. Manhole Rehabilitation Chemical Resistant Linings
Epoxy Products
High Bond Strength to Prepared Concrete
Most Can Be Applied to SSD Substrate
Amine Epoxy provides High Chemical Resistance
High Build Characteristics
Ease of Application
Beware of Claims that Epoxy Can be Directly Applied To Brick Manholes Without Mortar Repairs.
Mostly Small to Medium Sized Regional Manufacturers Some Have Protected Territories.

29. Manhole Rehabilitation Chemical Resistant Linings
Why The Sherwin Williams Manhole Program?
Tried and True Technology- SW Chose Epoxy As The Liner of Choice Because It Makes Sense!!
Only True National Company in The Manhole Market
Single Source Supplier-Partnerships with Avanti (Chemical Grouts) A.W Cook (Repair Mortars) With All Testing Completed Allowing Sherwin Williams to Offer Complete Warranty.
On Site Technical Support

30. Manhole Rehabilitation Chemical Resistant Linings
Why The Sherwin Williams Manhole Program?
Multiple Levels of Support for Contractors & Owners
Local Representatives & Project Development Managers
Support of National Wastewater Specialists
Largest Manufacturer of Protective Coatings in North America
4000 Stores Across North America
ISO Quality Control

31. Manhole Rehabilitation Chemical Resistant Linings
Sherwin-Williams Duraplate 5900 Epoxy Corrosion Protection Coating
100% Solids, Amine Cured Epoxy, Capable of being applied @ 60 – 125 mils DFT in a single coat.
Maybe applied to a Surface Saturated Dry (SSD) Substrate.
The product offers well balanced physical performance characteristics for use in municipal wastewater streams and wastewater treatment facilities.
Also Available In An Epoxy Mortar
Abrasion Resistance – 5 mg loss; Tensile Strength – 2,440 psi; Elongation – 530%; Tear Strength 52 pli; 20% Sulfuric Acid – No Effect
Application – Packaged by V.O. Baker into 600 ml X 600 ml cartridges

32. Manhole Rehabilitation Chemical Resistant Linings
Sherwin-Williams Duraplate 6100 Epoxy Corrosion Protection Coating
100% Solids, Amine Cured Epoxy, Capable of being applied @ 125 – 250 mils DFT in a single coat.
Maybe applied to a Surface Saturated Dry (SSD) Substrate.
“Next Generation” of Epoxy- Higher Build and Higher Chemical Resistance
Dry to Touch in 2 Hrs
Put Back in Service in 5-6 Hrs (Temperature & RH Dependent)
Abrasion Resistance – 5 mg loss; Tensile Strength – 2,440 psi; Elongation – 530%; Tear Strength 52 pli; 20% Sulfuric Acid – No Effect
Application – Packaged by V.O. Baker into 600 ml X 600 ml cartridges

33. Chemical Resistant Coatings & Linings
Sherwin-Williams Envirolastic AR 530 Brush Grade Polyurea Chimney Seal
100% Solids, Aromatic, Pure Polyurea, Capable of being applied up to 250 Mils DFT in a single coat.
Primer required for application to concrete and steel and application to a Surface Saturated Dry (SSD) substrate.
The product offers a flexible liner capable of bridging a 1/8” crack. It will withstand severe traffic loading and is packaged in a side by side plural component cartridges for pneumatic application.
Abrasion Resistance – 5 mg loss; Tensile Strength – 2,440 psi; Elongation – 530%; Tear Strength 52 pli; 20% Sulfuric Acid – No Effect
Application – Packaged by V.O. Baker into 600 ml X 600 ml cartridges

34. Municipal Wastewater Infrastructure Rehabilitation
Sherwin-Williams offers a complete line of products through our manufacture and distribution for the rehabilitation of all of your municipal wastewater infrastructure rehabilitation.

35. Thank You Questions?

36. Sherwin Williams Contacts
Murray Heywood – Water & Wastewater Business Development Manager Eastern North America
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Chris Hamilton – Protective & Marine Coating Specialist
Eastern PA
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Tim Bauman- Project Development Manager – PA
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