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The Nuisance & Necessity of Placing Concrete Directly on a Plastic Vapor Retarder
Presented By: Peter Craig Rick Smith Scott Tarr Steve Lloyd
Concrete Constructives Structural Services North S. Tarr Concrete Consulting Lloyd Concrete Services
For Many Years the Nuisance Aspects of Placing Concrete Directly on a Plastic Vapor Retarder were the Primary Focus of those in the Concrete Industry Slab Curling (warping) Dominant Joints Blistering & Delamination Longer Finishing Times Surface Crusting Shrinkage Cracking Subsidence Cracking over Reinforcing
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The History and E volution of Vapor Retarder Location
1981
Typical Slab Concrete Mixture w/c: 0.40 to 0.60 Slump: 4” to 6” Nicholson Study O.697 - 0.753 & 0.801 8” & 9”
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1989 The Blotter / Fill Course Layer
Fill layer
Vapor Retarder
The Blotter / Fill Course Concept
Water Table Earth
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1993 1996
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By 1998 the Number of Moisture-related Flooring Problems Directly Related to the Fill Course Detail had Increased Significantly
ACI Committee 302 forms a special Moisture Task Group Earth
Fill layer
C: 100% RH
High RH % Puncture Vapor Retarder Water Table RH% increases
The Problem with the Blotter / Fill Course Concept
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Earth
C:100% RH
Puncture Vapor Retarder Water Table
Vapor Retarder Directly Below Slab By 2001 a shift in thinking began taking place
Concrete International April 2001
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2001
By 2004, ACI 302.1R began to introduce a change in thinking
2004
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By 2006 the directive was clear Today - ACI 302.1R - 15
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Today
Today much has been learned about the Nuisance & Necessity
- f placing concrete directly on a plastic vapor retarder
The necessity is real, and doing so is today the industry standard for the design and construction of concrete slabs-
- n-ground that will receive a moisture sensitive floor
covering or coating. Up next are three of the concrete industry’s finest who will discus further some of the nuisance and benefit aspects of placing concrete directly on a plastic vapor retarder and what is being done to successfully mitigate potential concerns Rick Smith Scott Tarr Steve Lloyd
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Rick Smith
January 1987
My First World of Concrete, Houston, TX Astrohall / Astrodome
December 1987
Graduated Oklahoma State University with BS in Construction Management Technology
May 1988 ‐ 2000
Ribtec Carbon Steel Sales Manager Novocon / SI Concrete Systems Regional Sales Manager, Director of Technical Services
June 2000 – January 2016
Structural Services Inc.
29th Consecutive WOC!
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Subbase Subgrade – 4 to 6” Dense Graded Aggregate (DGA), 3/4” Minus Crusher Run Concrete
< 15’ OCEW
No Mention of a Vapor Retarder
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Concrete Isolation Joint aka - Expansion joint Construction Joint aka - Formed joint Contraction Joint aka - Control Joint Strategic Reinforcement Smooth Dowel Plate Dowel
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Concrete Smooth Dowel Plate Dowel Deformed Reinforcement Fiber Reinforcement
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Drying Shrinkage vs Time Shrinkage & Thermal Expansion / Contraction vs Aggregate Type.
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Slab Warms in Summer and Extrudes Filler out of the Joint Hone Flush and Fill With Semi‐ Rigid Epoxy in Late Winter Floor Expands, Extrudes Filler Lift Truck Shaves it Flush
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Channel Cuts Narrow & Wide Nosing Repairs
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1, 2, 3 or 4 Deep Pallet Riders 1600‐PSI Contact Pressure
4” Unreinforced Slab on Ground Plate Dowels at Construction Joints Joints < 10‐FT OCEW 10‐Mil Vapor Retarder Poured June 2005
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Non Uniform Joint Activation Faulted Joints
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Cut Out Existing Filler Install and Rake Silica Sand Fuse with Modified Structural Urethane Overfill with Semi‐Rigid Polyurea and Shave Flush
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#3 x 36” @ 16 or 18” OC “Hybrid” – Plate Dowels + #3 x 36 @ 24” OC ALTERNATING
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Construction Joint Contraction Joint
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6 & 7‐1/4” Slabs on Ground Reinforcement
#3’s @ 18” OCEW for 6” SOG #3’s @ 16” OCEW for 7‐1/4” SOG
TX‐DOT 247 Flex Base Moisture Conditioned Moisture Injected
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With Vapor Retarder Without Vapor Retarder
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With Vapor Retarder Without Vapor Retarder
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World of Concrete 2016
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To prevent transmitting moisture from the sub grade to the surface of the concrete Radon gas Codes Slip sheet
Finishing operations Curling Dominate joints Cracking Plastic Shrinkage Delamination
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