protective coating of access chambers...powerpoint presentation author martins silins created date...
TRANSCRIPT
![Page 1: Protective Coating of Access Chambers...PowerPoint Presentation Author Martins Silins Created Date 8/8/2010 2:08:39 PM](https://reader031.vdocuments.mx/reader031/viewer/2022011912/5f97b5fbfdd2f46b2d7c6744/html5/thumbnails/1.jpg)
Protective Coating of Access Chambers
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•Manholes
•Maintenance Holes
•Utility Holes
•Access Chambers
•Utility Vaults
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Manhole as % of Total Sewer Area
Pipeline Diameter
150mm 225mm 300mm
Distance between manholes
50m 30% 22% 17%
60m 26% 19% 15%
70m 23% 17% 13%
Manhole Diameter:1050mm
Manhole Depth:2.5m
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Manhole Infiltration
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Potential Reasons for Manhole Deterioration
• Leaking joints
• Infiltration through loose mortar and pre-cast joints
• Leaks around pipe ends
• Cracks in the structure
• Corrosion
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Potential Reasons for Deterioration
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Potential Reasons for Deterioration
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Manholes are becoming plastic
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Manhole Rehabilitation Contract
•Investigation / Assessment•Recommendations•Do the Work
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Classes of Manhole Rehabilitation
• Sacrificial Protective Coating– Cementitious Products
• Permanent Protective Coating– Polyurea / Epoxy / Polyurethanes
• Re-Build Coating– Epoxy Mortar
• Reconstruction
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Determining the Appropriate Solution
Depth of Loose Material Removed Solution
0 – 20mmStructural integrity of the access chamber is still intact.Protective Coating
20mm – up to steel reinforcing
Structural integrity is compromised and structural repair is necessary.Rebuild Coating:
Beyond steel reinforcing Complete Rebuild or replacement.
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Restore before its too late …
0200400600800
100012001400160018002000
Cost ($/m2)
Nothing ProtectiveCoating
RebuildCoating
CompleteStructuralRebuild
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Determining the Appropriate Solution
Opportunity for person access to determine the extent of
the deterioration
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Condition Assessment
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Manhole Assessment Report
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Condition Assessment Report
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Condition Assessment Report
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Condition Assessment
S604
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Condition Assessment Report – Core Samples
S604
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Condition Assessment
S601
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Condition Assessment Report – Core Samples
S601
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Condition Assessment
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Condition Assessment
S807 Wall
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Condition Assessment
S807 Base
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Condition Assessment Report – Core Samples
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Preparing the Surface
Remove the deteriorated concrete
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Surface Preparation
g
1
32 4
FIGURE 1
200mm
Concrete surface must be hard
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Surface Preparation
Concrete surface must be clean
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Surface Preparation
Concrete surface must be acid neutralised
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Application Conditions
Substrate surface moisture measurement
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Application Conditions
Ambient Humidity and Temperature
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Application Conditions
Surface Temperature
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Protective Coating – Polyurea
• Spray applied
• Ultra fast curing resin
• Tough and hard wearing
• Water tight
• Chemically resistant
• Flexible – can handle vibrations
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Polyurea Application
Stage 1:Apply Epoxy Primer
Apply to test piece to be left in manhole
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Polyurea Application
Primer Cure Test
Durometer measures surface hardness in 5 places
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Polyurea Application
Spray polyurea coating at 3mm thickness
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Polyurea Application
Has it cured?
Measure hardness
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Polyurea Application
Has it adhered?
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Polyurea Application
Inspect for pinholes, bubbles
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Polyurea Properties
• Chemical Resistance: High (pH 2 to 12): ISO175
• Abrasion Resistance: ASTM D460 1,000 cycles– Polyurea: <6mg– PVC: 25mg– Epoxy: 50mg
• Elongation: 425%: ASTM D412
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Polyurea Properties
• Hardness: (Shore D) 60: ASTM D2240
• Impact Resistance: (high): ASTM G14
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Polyurea
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Rebuild Coating : Epoxy Mortar
• General purpose epoxy based rebuild
• 20mm standard thickness
• Applied by hand / spray
• Tough and hard wearing
• Water tight
• Chemically resistant
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Rebuild Coating : Epoxy Mortar
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Example: Original Condition
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Example: After Jetting
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Example: Completed
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Epoxy Mortar Properties
• Compressive Strength: 60MPa
• Chemical Resistance: pH 2 to pH 12 ISO 175
• Hardness : (similar to concrete)
• Adhesion to concrete: 3.5MPa (concrete fails)
• Abrasion Resistance: many times higher than concrete
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Epoxy Mortar Properties
• Yield Strength– Epoxy Mortar: 22MPa– PVC: 45MPa– Concrete: 3 – 5MPa
• Short Term Modulus– Epoxy Mortar: 4,200MPa– PVC: 3,200MPa
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Summary
• An important component of complete sewer rehabilitation
• Separate Protection and Repair Solutions are available. Early intervention leads to $ savings
• Proper condition evaluation needed
• Proper surface preparation needed for success
• These systems offer permanent protection
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