self-consolidating concrete applications celik ozyildirim, phd, pe virginia concrete conference 2011
TRANSCRIPT
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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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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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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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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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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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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Pile Repair with SCC
• Colonial Parkway, Jamestown
• October 2009
• Barge damaged a pile
• Repaired with SCC
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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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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.