Shrinkage Compensating Shrinkage Compensating Concrete FloorsConcrete Floors

Thessen Concrete Contracting, Inc.Thessen Concrete Contracting, Inc.

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Are You In Search Of A Are You In Search Of A Better Method Of Better Method Of Concrete Floor Concrete Floor Construction?Construction?

Shrinkage Compensating Shrinkage Compensating Concrete Will Meet Your Concrete Will Meet Your Needs.....Needs.....

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Shrinkage Compensating ConcreteShrinkage Compensating Concrete

ACI Definitions:ACI Definitions:

“SCC As Defined By ACI (American Concrete Institute) “SCC As Defined By ACI (American Concrete Institute) Committee 223”…Committee 223”…

“Shrinkage-compensating Concrete Is An Expansive “Shrinkage-compensating Concrete Is An Expansive Cement Concrete Which Is Used To Minimize Cracking Cement Concrete Which Is Used To Minimize Cracking Caused By Drying Shrinkage In Concrete Slabs, Caused By Drying Shrinkage In Concrete Slabs, Pavements, And Structures.”Pavements, And Structures.” “Shrinkage-compensating Cement Is Constituted And “Shrinkage-compensating Cement Is Constituted And Proportioned Such That The Concrete Will Increase In Proportioned Such That The Concrete Will Increase In Volume After Setting And During Hardening. When Volume After Setting And During Hardening. When Properly Restrained By Reinforcement, Expansion Will Properly Restrained By Reinforcement, Expansion Will Induce Tension In The Reinforcement And Compression In Induce Tension In The Reinforcement And Compression In The Concrete. On Subsequent Drying, The Shrinkage So The Concrete. On Subsequent Drying, The Shrinkage So Produced, Instead Of Causing A Tensile Stress To Develop Produced, Instead Of Causing A Tensile Stress To Develop Which Might Result In Cracking, Merely Reduces Or Which Might Result In Cracking, Merely Reduces Or Relieves The Expansive Strains Caused By The Initial Relieves The Expansive Strains Caused By The Initial Expansion.” Expansion.”

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Advantages:Advantages:

No loss of load transfer due to No loss of load transfer due to continuous reinforcementcontinuous reinforcement

Floor flatness will not decline due to the Floor flatness will not decline due to the effects of curling during the curing effects of curling during the curing processprocess

Minimize: Minimize:

CaulkingCaulking CrackingCracking CurlingCurling Joint maintenanceJoint maintenance

Eliminate all control jointsEliminate all control joints ( Compare samples on slide # 5 )( Compare samples on slide # 5 )

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Both samples are 150’ X 150’/22,500 SFBoth samples are 150’ X 150’/22,500 SF

Sample # 1

6” non-reinforced Portland Cement Concrete floor slab with 3,300 linear feet of control joints,

and 144 independent panels.

This slab will experience curling at the control joints, panel

movement, and joint deterioration due to movement.

Sample # 2

6” Shrinkage-Compensating Concrete with NO control joints. There will be no slab movement because control joints have been

eliminated.

The slab will function as a single unit and provide positive load

transfer across the slab. 5

Steps And ProceduresSteps And ProceduresFor Producing A For Producing A

Shrinkage Compensating Shrinkage Compensating Concrete Floor SlabConcrete Floor Slab

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Step # 1Step # 1

““ASTM 878” Lab ASTM 878” Lab Testing To Determine Testing To Determine

The Amount Of The Amount Of Expansive Component Expansive Component Required In Mix DesignRequired In Mix Design

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Mixing SCC component with materials from the concrete supplier

Placing SCC mix in removable molds

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Consolidating SCC Concrete

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Measuring expansion in SCC samples

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Step # 2 Step # 2 Expansive Component Is Expansive Component Is

Added At The Concrete Batch Added At The Concrete Batch Plant During Truck Loading And Plant During Truck Loading And

MixingMixing

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Step # 3Step # 3

Preparing The Building Preparing The Building Pad For Concrete Floor Pad For Concrete Floor

Slab PlacementSlab Placement

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Construction joints Construction joints are formed with a are formed with a steel armored edge steel armored edge and diamond dowels and diamond dowels (by PNA) see details (by PNA) see details on slide #15on slide #15

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Compressible expansion joint material is used to isolate fixed objects, building columns, walls, etc. Additional reinforcement is also used at these locations.

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Step # 4Step # 4Rebar Reinforcement Is Rebar Reinforcement Is Positioned For Proper Positioned For Proper Restrained ExpansionRestrained Expansion

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Step # 5Step # 5SCC Placing And Finishing SCC Placing And Finishing

Procedures Are The Same As Procedures Are The Same As Portland Cement ConcretePortland Cement Concrete

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Step # 6Step # 6Water Cure Surface For Complete Water Cure Surface For Complete Cement Hydration And Maximum Cement Hydration And Maximum

Strength Gain Of ConcreteStrength Gain Of Concrete

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Benefits Of Shrinkage Benefits Of Shrinkage Compensating ConcreteCompensating Concrete

Reduce facility down time for costly slab Reduce facility down time for costly slab repairrepair

No control joints to maintain or re-caulkNo control joints to maintain or re-caulk

Floor flatness will remain unchanged after Floor flatness will remain unchanged after building is in servicebuilding is in service

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Completed SCC Warehouse Facility In ServiceCompleted SCC Warehouse Facility In Service

Please contact me Please contact me to schedule a visit to schedule a visit

to a Shrinkage to a Shrinkage Compensating Compensating

Concrete facility in Concrete facility in serviceservice

Perry ThessenPerry ThessenPhone: 270-842-Phone: 270-842-

85508550

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