3/10/2016 The Nuisance & Necessity of Placing Concrete Directly - PDF document

3/10/2016 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 1

3/10/2016 The History and E volution of Vapor Retarder Location 1981 Typical Slab Concrete Mixture Nicholson Study w/c: 0.40 to 0.60 O.697 - 0.753 & 0.801 Slump: 4” to 6” 8” & 9” 2

3/10/2016 1989 The Blotter / Fill Course Layer The Blotter / Fill Course Concept Fill layer Vapor Retarder Earth Water Table 3

3/10/2016 1993 1996 4

3/10/2016 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 The Problem with the Blotter / Fill Course Concept Fill layer Vapor Retarder RH% increases High RH % Puncture C: 100% RH Earth Water Table 5

3/10/2016 Vapor Retarder Directly Below Slab Vapor Retarder Puncture C: 100% RH Earth Water Table By 2001 a shift in thinking began taking place Concrete International April 2001 6

3/10/2016 2001 By 2004, ACI 302.1R began to introduce a change in thinking 2004 7

3/10/2016 By 2006 the directive was clear Today - ACI 302.1R - 15 8

3/10/2016 Today Today much has been learned about the Nuisance & Necessity of 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- on-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 9

3/10/2016 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. 29 th Consecutive WOC! 10

3/10/2016 No Mention of a Vapor Retarder < 15’ OCEW Concrete Subgrade – 4 to 6” Dense Graded Aggregate (DGA), 3/4” Minus Crusher Run Subbase 11

3/10/2016 Smooth Dowel Plate Dowel Strategic Reinforcement Contraction Joint Construction Joint Isolation Joint aka - Control Joint aka - Formed joint aka - Expansion joint Concrete 12

3/10/2016 Fiber Deformed Reinforcement Smooth Dowel Reinforcement Plate Dowel Concrete 13

3/10/2016 Shrinkage & Thermal Expansion / Contraction vs Drying Shrinkage vs Time Aggregate Type. 14

3/10/2016 Hone Flush and Fill With Semi‐ Slab Warms in Summer and Rigid Epoxy in Late Winter Extrudes Filler out of the Joint Floor Expands, Extrudes Filler Lift Truck Shaves it Flush 15

3/10/2016 Channel Cuts Narrow & Wide Nosing Repairs 16

3/10/2016 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 17

3/10/2016 Non Uniform Joint Activation Faulted Joints 18

3/10/2016 Cut Out Existing Filler Install and Rake Silica Sand Fuse with Modified Structural Overfill with Semi‐Rigid Urethane Polyurea and Shave Flush 19

3/10/2016 “Hybrid” – Plate Dowels + #3 x #3 x 36” @ 16 or 18” OC 36 @ 24” OC ALTERNATING 20

3/10/2016 Construction Joint Contraction Joint 21

3/10/2016 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 22

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3/10/2016 With Vapor Retarder Without Vapor Retarder 26

3/10/2016 With Vapor Retarder Without Vapor Retarder 27

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3/10/2016 World of Concrete 2016 32

3/10/2016 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 33

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