Self-Consolidating Concrete Applications Celik Ozyildirim, PhD, PE Virginia Concrete Conference 2011.

Self-Consolidating Concrete Applications

Celik Ozyildirim, PhD, PE

Virginia Concrete Conference 2011

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Outline• Why SCC• Applications

– Precast and Prestressed• Precast: Bebo arch• Precast Prestressed: Bulb-T beams

– Cast-in place applications• Drilled shaft• Repair

• Future

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Smart Road Bridge

regular HPC columnexhibits poorconsolidation

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Regular HPC Beampoor consolidation

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Corrosion

Poor consolidation

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SCCSelf-Consolidating Concrete — fresh concrete that can flow around reinforcement and consolidate within formwork under its own weight without vibration and that exhibits no defect due to segregation or bleeding.

ACI ConcreteTerminology

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High Workability

Conventional

SCC

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Regular Concrete

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SCC Arch Bridge (2001)

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Smooth Surface Finish

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Segregation

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No Segregation

Tube of SCC 4 ft long

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Formwork

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Air Loss in Unstable SCC

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Precast Applications

• Arch Bridge, 2001

• Test Beams, 2003

• Rte 33 Beams, 2005

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SCC Arch Bridge – 2001

• Arch length of 45 ft

• First SCC application

• 5,000 psi • 2500 coulombs

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Arch Bridge Properties at 28 Days

Batch

Comp. Strength (psi)Avg. Perm.

(coul)Unrodded Rodded

Slag #1 7390 ---- 900

Slag #2 7670 8020 1724

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Route 33 over Pamunkey River

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SCC Beams – Rte 33 (2005)

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Rte 33 Properties at 28 Days

PropertyB1

(SCC)B2

(SCC)B3

(Regular)B4

(Regular)

Comp. (psi) 10,110 10,700 7,960 7,610

E (106 psi) 4.86 5.35 5.26 4.98

Splitting (psi) 820 755 675 565

Perm (coul) 869 996 1,011 985

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Bugholes – Rte 33

• SCC

Regular

SCC

Control

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SCC Beams – Rte 33

High slump flow

Low slump flow

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Lightweight SCC

• Bridge: Rte 17 over Rte 15/29 in Fauquier County

• Two spans, each 97 ft 7 in.• 53 in Bulb-T beams• Minimum 8,000 psi and maximum 1500

coulombs

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LW SCC Test Beam

53 in Bulb-T, 65-ft long

Min. 8000 psi

Max. 120 lb/ft3

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Drilled Shafts

• Route 28 over the Broad Run• Two Bridges, 2006-2007• Each bridge has two abutments, two

piers for a total of 24 drilled shafts. • In one bridge, 12 drilled shafts has SCC

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Drilled Shaft – Route 28

SCC

Control

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Drilled Shaft – Route 28

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Drilled Shaft – Route 28

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Drilled Shaft – Route 28

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Pile Repair with SCC

• Colonial Parkway, Jamestown

• October 2009

• Barge damaged a pile

• Repaired with SCC

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Colonial Parkway

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Colonial Parkway

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Colonial Parkway

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Colonial Parkway

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Substructure Repair, 2010

• Two bridge substructures at Altavista repaired with SCC

• Route 699 bridge backwalls

• Route 712 over Route 29 bypass• Columns and pier caps repaired using

SCC instead of shotcrete• Anodes placed

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Route 699

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Route 699

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Route 699

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Route 699

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Route 712 over Route 29 Bypass

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Route 712

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Route 712

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Route 712

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Route 712

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Route 712

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FUTURE

• SCC in beams

• SCC in piers and pier caps at Nimmo Parkway over West Neck Creek .

• SCC drilled shafts

• SCC in repairs

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Conclusions

• SCC with high workability, proper strength, and adequate durability can be produced using locally available materials.

• Attention must be paid to formwork, segregation, the air-void system, and shrinkage.

Thank you.

Celik Ozyildirim, PhD, PE

Virginia Concrete Conference 2011

Virginia Concrete Conference 2011