watertight integrity dampproof vs. waterproof - shea concrete
TRANSCRIPT
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Watertight INTEGRITYDampproof vs. Waterproof
Sam LinesConcrete Sealants, Inc.
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Course Outline
• Precast Concrete Joints• Rubber gaskets• Butyl sealants• Joint wrap
• Concrete Porosity• Sealers• Coatings
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Precast Concrete JointsMaking watertight connections
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About ASTM International
• One of the world’s largest international standards developing organization.
• 30,000 Global Members
• >12,500 Int. Standards
• >140 Countries
• 145 Tech Committees
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Committee Structure
The Technical Committees are divided into seven families
• (A)Ferrous Metals
• (B) Non-Ferrous Metals
• (C) Cementitious, Ceramic, Concrete and Masonry Materials
• (D) Miscellaneous Materials
• (E) Miscellaneous Subjects
• (F) Materials for Specific Applications
• (G) Corrosion, Deterioration and Degradation of Materials
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ASTM C443 Joints for Pipe and Manholes
• Rubber Gasket Specification
• 13 psi / 10 minutes in straight alignment
• 10 psi / 10 minutes deflected
• Specific joint designs
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ASTM C990 Preformed Butyl Tape
• 10 psi / 10 minutes
• Self-Adhesive
• Fills irregular joints
• Testing to meet the ASTM C443 requirements
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Hydrostatic Testing
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13 psi for 10 minutes
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ASTM C877 External Sealing Band
• Positive side water resistance to 13 psi
• Prevents “silting” of fines in the soil
• Available in Type I, Type II, and Type III
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Type I
From ASTM C877-16
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Type II
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Type III
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Placement of Preformed Butyl Sealant in a Precast Joint
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Preformed Butyl Sealant Installation
• Sealant Characteristics
• size
• placement
• compression
• Joint quality
• Honeycomb/Spalls in joint
• Dirt and debris
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Sealant Placement
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Watertight System
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Concrete Porosity
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Concrete is Porous
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Waterproof or Dampproof
• Hydrostatic condition
• Below/Above grade
• Coating thickness
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Waterproof Definitions
• “Building codes typically require that basement walls be dampproofed for conditions where hydrostatic pressure will not occur, and waterproofed where hydrostatic pressures may exist.”
- National Concrete Masonry Association
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Waterproof Definitions
• Waterproofing coatings are typically 40 mils or greater in thickness.
• Dampproofing coatings are generally thin: around 12 mils or less.
• Resistant to hydrostatic pressure.
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Assessment Question
• Can anything truly be watertight? What about steel? Glass? Plastic?
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A Variety of Technologies
• Coatings/paints• Acrylics• Epoxies• Urethanes• Asphalt
• Cementitious coatings• Portland based• Special
materials
• Sealers• Silane• Siloxane• Siliconates• Silicas• Combinations
• Admixtures• Crystalline
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Coatings vs. Sealers
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Coatings Challenges
• Delamination• Excessive Concrete moisture• Concrete dirty or dusty• Form release agent on the concrete• Forming surface
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The “X” Adhesion Test
Good AdhesionBad Adhesion
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Coating Problems
• Outgassing• Air escapes from
concrete• Leaves pinholes,
typically in thin coatings
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Cementitious Coatings
Cement based coatings bond well to concrete. They often fill the small voids in the concrete. They offer a thicker coating than some paints.
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Cold Applied Waterproofing Membrane
• ASTM C836
• Elastomeric (flexible)
• Resists Hydrostatic Pressure
• 40 – 60 Mils Typical
• Single and Two Component Systems
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Sealers for Concrete
Penetrating sealers come in different sizes. Smaller molecules penetrate deeper, some are reactive, and some create hydrophobicity.
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Crystalline Waterproofing
•Concrete admixture (powder/liquid)
•Works internally, reacts chemically
•Crystals created to block the pores
•Waterproof [CRD C48]
• Low Permeability [ASTM C1585]
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Waterproofing from the inside
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Questions?
Thank you!
Sam Lines, Engineering Manager
Concrete Sealants, Inc.
800-332-7325