Self-Consolidating Concrete
Applications
Celik Ozyildirim, PhD, PE
Virginia Concrete Conference 2011
Outline
• Why SCC
• Applications
– Precast and Prestressed
• Precast: Bebo arch
• Precast Prestressed: Bulb-T beams
– Cast-in place applications
• Drilled shaft
• Repair
• Future
2
Smart Road Bridge
regular HPC column
exhibits poor
consolidation
3
Regular HPC Beam
poor consolidation
4
Corrosion
Poor consolidation
5
SCC
Self-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
6
High Workability
Conventional
SCC
7
Regular Concrete
8
SCC Arch Bridge (2001)
9
Smooth Surface Finish
10
Segregation
11
No Segregation
Tube of SCC 4 ft long
12
Formwork
13
Air Loss in Unstable SCC
14
Precast Applications
• Arch Bridge, 2001
• Test Beams, 2003
• Rte 33 Beams, 2005
15
SCC Arch Bridge – 2001
• First SCC application
• Arch length of 45 ft
• 5,000 psi
• 2500 coulombs
16
Arch Bridge Properties at 28 Days
Comp. Strength (psi)
Unrodded
Rodded
Avg. Perm.
(coul)
Slag #1
7390
----
900
Slag #2
7670
8020
1724
Batch
17
Route 33 over Pamunkey River
18
SCC Beams – Rte 33 (2005)
19
Rte 33 Properties at 28 Days
Property
B1
(SCC)
B2
B3
B4
(SCC) (Regular) (Regular)
Comp. (psi)
10,110 10,700
E (106 psi)
4.86
5.35
Splitting (psi)
820
755
7,960
5.26
675
7,610
4.98
565
Perm (coul)
1,011
985
869
996
20
Bugholes – Rte 33
• SC
C
Regular
SCC
Control
21
SCC Beams – Rte 33
High slump flow
Low slump flow
22
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
23
LW SCC Test Beam
53 in Bulb-T, 65-ft long
Min. 8000 psi
Max. 120 lb/ft3
24
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
25
Drilled Shaft – Route 28
SCC
Control
26
Drilled Shaft – Route 28
27
Drilled Shaft – Route 28
28
Drilled Shaft – Route 28
29
Pile Repair with SCC
•
•
•
•
Colonial Parkway, Jamestown
October 2009
Barge damaged a pile
Repaired with SCC
30
Colonial Parkway
31
Colonial Parkway
32
Colonial Parkway
33
Colonial Parkway
34
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
35
Route 699
36
Route 699
37
Route 699
38
Route 699
39
Route 712 over Route 29 Bypass
40
Route 712
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Route 712
42
Route 712
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Route 712
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Route 712
45
FUTURE
• SCC in beams
• SCC in piers and pier caps at
Nimmo Parkway over West
Neck Creek .
• SCC drilled shafts
• SCC in repairs
46
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.
47
Thank you.
Celik Ozyildirim, PhD, PE
Virginia Concrete Conference 2011
Virginia Concrete Conference 2011