an experimental study for improving the durability of concrete bridge decks
TRANSCRIPT
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An Experimental Study for Improving the Durability
of Concrete Bridge Decks
2009. 9. 25
Expressway & Transportation Research Institute, Korea Expressway Corporation
Jinwon Suh
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Damage in Bridge Decks1
Phase I Study : HPC for Deck 2
Field Application of HPC Deck4
Phase Study : HPC for DeckⅡ3
Conclusions5
Presentation Outline
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1 Damage in Bridge Decks
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Concrete Bridge Deck
- Exposure to vehicle loads and environmental attacks
- Frequent failure compared with other bridge members
- Bridge deck deterioration is major bridge maintenance problem
Deck Failure
TV Newspaper
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Damages in Concrete Bridge Deck
Water & Salt Infiltration
Top PartDamage
Overlay Defi-ciency
Deep Dam-age Failure
Crack
Pothole
Leakage
Efflorescence on Bottom
Efflorescence on Overlay
Scaling under Overlay
Segregation
Damage un-der Rebar
Punching Out
Staying Water
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2 Phase I Study : HPC for Deck
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Concrete Mix Design
Classifica-tion
Ratio of Binder (%)Note
Cement Fly Ash Silica Fume
Granulated Blast Furnace
SlagOPC 100% - - -
FA 80% 20% - -
FS 76% 20% 4% -
BS 60% - - 40%
CompressiveStrength
Gmax
(mm)Slump(cm)
Air Content(%) Note
27 MPa35 MPa 25 13±2.5 6.5±1.0
Parameter for HPC Mix
Binder Proportions
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Classification W/B(%)
S/A(%)
Water(kg/m3)
Binder(kg/m3)
FineAgg.
(kg/m3)
Coarse Agg.
(kg/m3)
SuperPlasticizer
(kg/m3)Cement FlyAsh
SilicaFume
Blast-furnace
Slag
27MPa
OPC 42.2 42.5 154 365 - - - 774 1059 2.19
FA 41.4 42.4 151 292 73 - - 766 1044 2.19
FS 42.2 42.5 152 272 72 14 - 765 1043 2.15
BS 42.3 42.5 150 213 - - 142 777 1060 2.13
35MPa
OPC 35.6 38.9 155 436 - - - 684 1083 2.62
FA 35.1 38.9 153 349 87 - - 674 1067 2.62
FS 35.8 38.9 154 327 86 17 - 672 1064 2.58
BS 34.1 38.7 151 252 - - 168 689 1091 2.52
Concrete Mix Design
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Test Items and Methods
Items Standard Age Note
FRESH
Slump KS F 2402 After mixing
Air Content KS F 2401 After mixing
Cracking Tendency AASHTO DesignationPP. 34-99 28 days O-Ring Test
Length Change KS F 2424 12 weeks
HARDENED
Compressive Strength KS F 2405 3,7,28,56,90 days
Freezing-ThawingResistance KS F 2456 Every 30 cycles 300cycles
Type A
Chloride PenetrationResistance
KS F 2711 28, 56, 90 days RCPT
KS F 4930 for 40 days Ponding Test
Scaling Resistance ASTM C 672 50 cycles Visual Inspection
Abrasion Test JIS K 7204 28 days
Air Void of Hardened Con-crete ASTM C 642 After 28 days
Absorption Ratio KS F 2518 After 28 days
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Compressive Strength
• The long-term compressive strength of mixes with admixtures were higher than that of OPC
27MPa 35MPa
3days 7days 28days 56days0
10
20
30
40
50
60
OPC FA FS BS
Com
pres
sive
Str
engt
h (M
Pa)
3days 7days 28days 56days0
10
20
30
40
50
60
OPC FA FS BS
Com
pres
sive
Str
engt
h (M
Pa)
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Free Shrinkage (Length Change)
• Length changes of 35MPa mixes were larger than those of 27MPa.• FA and FS Mixes with fly ash were less than OPC and BS Mixes.
27MPa 35MPa
1 2 3 4 6 812
weeks
-7
-6
-5
-4
-3
-2
-1
0
OPC FA FS BS
Leng
th C
hang
e ra
tio (×
10-
4)
1 2 3 4 6 8 12 weeks
-7
-6
-5
-4
-3
-2
-1
0
OPC FA FS BSLe
ngth
Cha
nge
ratio
(× 1
0-4)
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Crack Resistance (O-Ring Test)
< Cracks occur >
27MPa : BS(10.4day)
35MPa : OPC(17.6day), BS(8.7day)
<No crack until 28day>
27MPa : OPC, FA,FS
35MPa : FA, FS
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Freezing-Thawing Resistance
• The higher compressive strength increased the freezing-thawing resistance • The admixture type did not have significant effect on the freezing-thawing resistance
0 30 60 90 120 150 180 210 240 270 300 33075
80
85
90
95
100
OPCFAFSBS
Freezing-thawing cycles
Rel
ativ
e dy
nam
icm
odul
us o
f ela
stic
ity(%
)
0 30 60 90 120 150 180 210 240 270 300 33075
80
85
90
95
100
OPCFAFSBS
Freezing-thawing cyclesR
elat
ive
dyna
mic
mod
ulus
of e
last
icity
(%)
27MPa 35MPa
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Scaling Resistance
• The strength of con-
cretes did not have signif-
icant effect on the scaling
resistance .
• Mixes with ground gradu-
ated blast furnace slag
were better than other
mixes.
Classification Survey Result Rating
27
MPa
OPC overall scaling, aggregate exposing III
FA scaling in the center, aggregate exposing II
FS aggregate exposing at the center, partially scaling II
BS partially scaling and exposing aggregate I
35
MPa
OPC overall scaling and exposing aggregate III
FA overall scaling and exposing aggregate III
FS aggregate exposing at the center, partially scaling II
BS partially scaling and exposing aggregate II
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Rapid Chloride Permeability Test• Compressive strength did
not have much effect on the
chloride ion penetration re-
sistance.
• Ground graduated blast fur-
nace slag and silica fume
improved the chloride ion
penetration resistance.
• Using admixtures was more
effective than increasing
strength.
28 56 90 days0
500
1,000
1,500
2,000
2,500
3,000OPC FA FS BS
Char
ge P
asse
d (C
)
Low
VeryLow
Negligible
Moderate
28 56 90 days0
500
1,000
1,500
2,000
2,500
3,000OPC FA FS BS
Char
ge P
asse
d (C
)
Low
VeryLow
Negligible
Moderate
27MPa
35MPa
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Chloride Ponding Test
OPC-27 8.2mm
FA-275.4mm
FS-274.1mm
BS-273.5mm
OPC-355.1mm
FA- 354.2mm
FS- 354.0mm
BS- 353.2mm
Penetration Depth of Chloride
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Summary of Phase I Study
ClassificationCom-
pressive Strength
Length Change
Freeze-Thaw Resis-tance
Chloride Ion
Penetra-tion
Scaling Resis-tance
Penetra-tion
depth
Abra-sion Test
Crack-ing Ten-dency
27Mpa
OPC O △ O △ △ △ O O
FA O O O △ O △ O O
FS O O O O O O O O
BS O △ O O O O O ×
35MPa
OPC O △ O O O △ O ×
FA O △ O O O O O O
FS O △ O O O O O O
BS O △ O O O O O ×
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Conclusions of Phase I Study
In order to improve the durability of concrete ,
Increasing compressive strength of concrete
by using the more amount of cement did not
have significant effect
Using admixtures were even more effective
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Ground granulated blast furnace slag : improve the chloride ion penetration resistance and scaling
resistance performance reduce the crack resistance performance
Fly ash : increase the crack resistance performance did not much affect the chloride ion penetration resistance
and scaling resistance performance
In order to improve the durability and the crack resistance,
using ternary based binder is desirable.
Conclusions of Phase I Study
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3 Phase StudyⅡ3 Phase II Study : HPC for Deck
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Description of the Mixes in Phase Ⅱ
In Phase II Study, the following three binder proportion were
tested
OPC : only cement as binder
HPC(KR) : 60% cement, 30% ground granulated blast fur-
nace slag, and 10% fly ash
HPC(NY) : 74% cement, 20% fly ash, and 6% micro silica
fume (similar to concrete deck of NYDOT, USA.)
The compressive strength : 30MPa
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Concrete Mix Design
Design Strength(MPa)
Gmax.
(mm) W/B Slump(cm) Air Content(%) Note
30 25 Less than 0.4 13±2.5 6.5±1.0 -
Classifica-tion
Ratio of Binder (%)Note
OPC Fly Ash Silica Fume
Granulated Blast Furnace
SlagOPC 100% - - -
HPC(KR) 60% 10% - 30%
HPC(NY) 74% 20% 6% - NY-DOT
Parameter for HPC
Binder Proportions
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Classification W/B(%)
S/A(%)
Water(kg)
Unit Content of Binder(kg/m3)FineAgg.
(kg/m3)
Coarse Agg.
(kg/m3)
SuperPlasticizer
(kg/m3)Cement FlyAsh
Blast-furnace
SlagSilicaFume
30MPa
OPC 40.0 42.6 158 395 - - - 746 1037 2.37
HPC(KR) 38.4 40.4 159 249 41 124 - 691 1051 2.48
HPC(NY) 40.0 40.4 164 301 81 - 24 683 1038 2.44
Concrete Mix Design
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Compressive Strength
3 7 28 56 90 days0
10
20
30
40
50
60OPC HPC(KR) HPC(NY)
Com
pres
sive
Stre
ngth
(MPa
)
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Crack Resistance
OPC HPC(KR), HPC(NY)
Age 10days -> 1st crack occurred
Age 28days -> Total 8 hair-cracks occurred
No crack until 28days
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0 30 60 90 120 150 180 210 240 270 300 330 75
80
85
90
95
100OPC HPC(KR) HPC(NY)
Freezing-thawing cycles
Rel
ativ
e dy
nam
icm
odul
us o
f ela
stic
ity(%
)
Freezing-Thawing Resistance
80
79
76
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Scaling Resistance
Rate 2
Rate 1
OPC
50cycles : 0.217kg/m2
100cycles : 0.339kg/m2
HPC(KR)
50cycles Weight Losses : 0.176kg/m2
100cycles Weight Losses : 0.326kg/m2
Rate 2
HPC(NY)
50cycles : 0.273kg/m2
100cycles : 0.367kg/m2
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28 56 90 days0
500
1,000
1,500
2,000
2,500
3,000
OPC HPC(KR) HPC(NY)
Cha
rge
Pass
ed (C
)
Rapid Chloride Permeability Testing
Low
VeryLow
Negligible
Moderate
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Penetration Depth of Chloride
OPC
7.3mm
3.6mm
HPC(KR)
4.5mm
HPC(NY)
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To improve the durability of concrete, The ternary binders(HPC(KR), HPC(NY)) were very effective in
Improving the durability of concrete . The durability performance of HPC(KR) mix was similar to that
of HPC(NY) Micro silica fume is very expensive because it is not produced in
Korea. Ground granulated blast furnace slag and fly ash are not expen-
sive The HPC(KR) was selected the best mixture for bridge deck
Conclusions of the Phase Ⅱ Study
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4 Field Application
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Field Application
Test Bridge
Lane Name SuperStructure
Length(m) Width(m) Deck
Area(m2) Note
HonamExpressway Pre-flex Girder 30.0 13.0 390 -
Classification W/B(%)
S/A(%)
Water(kg)
Unit Content of Binder(kg/m3)FineAgg.
(kg/m3)
Coarse Agg.
(kg/m3)
SuperPlasticizer
(kg/m3)Cement FlyAsh
Blast-furnace Slag
30MPa
HPC37.7 39.0 154 245 41 123 666 1050 2.6
Concrete Mix Design
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Construction Process
Concrete Placement
Waterproof by Sealer
Wet Curing
Follow-up Survey (after 8 months)
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Compressive Strength
28days 56days 90days0
10
20
30
40
50
60OPC(lab) HPC(lab) HPC(site)
Com
pres
sive
Stre
ngth
(MPa
)
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Crack Resistance
HPC(lab) : No Crack until age 56days
OPC(lab) : 1st Crack age 10days
HPC(site) : No Crack until age 56days
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Freezing-thawing Resistance
0 30 60 90 120 150 180 210 240 270 300 330 75.0
80.0
85.0
90.0
95.0
100.0
OPC(lab) HPC(lab) HPC(site)
Freezing-thawing cycles
Rel
ativ
e dy
nam
icm
odul
us o
f ela
stic
ity(%
)
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Rapid Chloride Permeability Test
28days 56days 90days0
500
1,000
1,500
2,000
2,500
3,000OPC(lab) HPC(lab) HPC(site)
Cha
rge
Pass
ed (C
)
Low
VeryLow
Negligible
Moderate
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Comparison of Test Results
Test Items Standard OPC(lab) HPC(lab) HPC(site) Note
Air Content(%) KS F 2402 5.4 5.9 5 6∼
Compressive Strength(MPa) KS F 2405 34.5/42.0/49.2 35.0/47.9/52.5 42.7/47.1/50.1 Age
28/56/90days
Cracking Tendency ASTM A 501 1st Crack at Age 10 days No Crack No Crack Age 56days
Freeze-Thaw Resistance(%) KS F 2456 78.7 80.4 81 84∼ Type A
300cycles
Scaling Resistance ASTM C 672 1 1 0 1∼
RCPT ASTM C 1202AASHTO T259
Moderate Very Law Very Law Age 28days
Law Very Law Very Law Age 56days
Law Very Law Very Law Age 90days
Air SpacingFactor(mm) ASTM C 642 0.26 0.23 0.29
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5 Conclusions
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Conclusions
In order to improve the durability of concrete ,
Increasing compressive strength of concrete
by using the more amount of cement did not
have significant effect
Using admixtures were even more effective
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Ground granulated blast furnace slag : improve the chloride ion penetration resistance and scaling
resistance performance reduce the crack resistance performance
Fly ash : increase the crack resistance performance did not much affect the chloride ion penetration resistance
and scaling resistance performance
In order to improve the durability and the crack resistance,
using ternary based binder is desirable.
Conclusions of Phase I Study
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Conclusions
The developed HPC with ternary based binder for bridge deck,
The binder proportion was composed of 60% cement, 30%
ground granulated blast furnace slag, and 10% fly ash.
No problem was found under the experimental field construction
and in follow-up survey until 8 months from the placement of
HPC bridge deck.
The compressive strength and durable characteristics were
equal or better than the laboratory test results.
In other to reduce the Life Cycle Cost, the developed HPC could
be used in Korea.
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Thank You!!