SELF-COMPACTING CONCRETE (SCC)

SELF-COMPACTING CONCRETE (SCC)

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Dr. ShrishailB. Anadinni
Associate Dean(Core Branches)
School of Engineering
Presidency University,
Bengaluru
SELF-COMPACTING CONCRETE (SCC)

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What is SCC(Self-Compacting Concrete)?
Itisflowingconcretemixthatdoes
not require additional
(external)workforconsolidation.
Consolidatesunderitsownweight.

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Performanc
e
of Concrete
Properties of
Fresh Concrete
Cement
Aggregates: F.A. & C.A.
Chemical Admixtures
Mineral Admixtures
Quantity of Water
Properties of
Hardened Concrete
Mixing
Transportation
Placing
Compaction
Curing
Introduction –Conventional Concrete and SCC

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•In1983theproblemofthedurabilityofconcretestructurewasmajortopicofinterestin
Japan
•Thecreationofdurableconcretestructuresrequiresadequatecompactionbyskilled
workers
•ThenecessaryofthistypeofconcretewasproposedbyOkamurain1986
•Bytheearly1990’sJapanhasdevelopedandusedSCC
•StudiestodevelopSCChavebeencarriedbyOzawaandMelawiattheUniversityofTokyo
•Asoftheyear2000,SCCusedforPrefabricatedproducts(Precastmembers)andready
mixedconcrete(cast-in-situ)inJapan,USAandlateronIndia
•PresentdaySCCcanbeclassifiedasanadvancedconstructionmaterialorSpecialConcrete
DevelopmentOfSCC

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Fillingability:TheabilityofSCCtoflowintoandfillcompletelyallspaceswithinthe
formwork,underitsownweight.
Passingability:TheabilityofSCCtoflowthroughtightopeningsuchasspacesbetweensteel
reinforcingbarswithoutsegregationorblocking.
Segregationresistance:Thedistributionofaggregateparticlesremainshomogeneousinboth
verticalandhorizontaldirection.
Staticsegregation:duetogravity,verticaldirection
DynamicSegregation:duetoflow,horizontaldirection
BasicPropertiesofSCC

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Theory behind SCC or High workable Concrete
Paste ------Water + cement
Mortar -----Paste + Fine Aggregate
Concrete ----Mortar + Coarse Aggregate
Concrete is a suspension of coarse Aggregate in mortar
Mortar is a suspension of fine Aggregate in paste
Paste is a suspension of fine cement in water

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Adequate Viscosity
Increase the water
powder ratio (w/p ratio)
Use of Super plasticizers
Decrease the water
powder ratio
Use Viscosity Modifying
Agent
To increase the
Deformability of the
paste
Achievement of SCC

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Self Compactabilityof Concrete
High
Deformability
Self
Compactability
High Segregation
Resistance
Use of Super
Plasticizer
Limited Volume of
Aggregate
Reduced Water-
Powder ratio

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Cement
CementitiousMaterials or Mineral Admixture
(Fly ash, GGBS, Silica fume & etc)
Fine Aggregate
Coarse Aggregate
Water
Chemical Admixture
Super Plasticizers
Viscosity modifying admixture
Basic Ingredients of SCC

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Composition of SCC
Coarse Aggregate
A
i
r
Fines
Fine AggregateWaterCement

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Cement:
All types of cement can be used
Typical cement content: 350 to 450 kg/m
3
Higher cement can cause higher shrinkage and thermal stress issues
Lesser cement possible with use of supplementary cementitious
materials
Type and quality of Ingredients

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Supplementary Cementitious Materials:
Fly ash, GGBS, Micro silica can be used
Improves workability and cohesiveness, reduces bleeding and
segregation
Improves durability and overall performance of Concrete
Type and quality of Ingredients

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Aggregates:
All sound aggregate meeting normal requirements
They can be crushed or natural aggregate of any mineral
composition(Lime stone, Dolomite, quartz, Basalt etc)
Minimum size of aggregate is limited to 20mm and aggregate
shape should be round or cubical
Elongated aggregates do not provide satisfactory mix due to
increase in internal friction
Type and quality of Ingredients

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Super Plasticizers:
TheyareessentialcomponentsofSelfCompactingConcrete.
Sulphonatedmelamineformaldehyde,Napthalaneformaldehyde
condensateandPolycarboxyliceitherbasesuperplasticizersare
commonlyused.
Thewaterreductionshouldbemorethan25%allowingfortotal
watercontentof160to180lit/m
3
intheconcretemix.
Type and quality of Ingredients

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Large quantity of fines(500 to 650 kg/m
3
)
Use of High range water reducing admixture (Water reduction :25%)
Viscosity modifying admixture
Limiting the maximum size of coarse aggregate
Higher fraction of Fine Aggregate
Mechanism of SCC

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Faster construction
Reduction in site manpower
Improved filling capacity of highly congested structural member
Better surface finishes
Easier in placing
Improved durability
Greater freedom in design
Thinner concrete section
Reduced noise levels due to absence of vibration
Safer working environment
Advantage of Working with SCC

17. As per the European Guidelines for Self-Compacting Concrete
Equipment's Required to find the Flow Properties of SCC
as per
EFNARC-2005
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Property
Test methods
Laboratory Field
Filling Ability
Slump flow Slump flow
T
50cmSlump flow T
50cmSlump flow
V –Funnel V –Funnel
Orimet
Passing ability
L –Box J -Ring
U –Box
Fill Box
Segregation
Resistance
Wet screen test Wet screen test
V funnel test T
5sec V funnel test T
5sec
Self-Compatibility Evaluation

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Sl. No Method Units Recommended range
Min. Max.
1 Slump Flow mm 650 800
2 T
50cmslump flow sec 2 5
3 V Funnel sec 6 12
4 L Box H2/H1 0.8 1.0
5 U Box H2-H1(mm) 0 30
6 J Ring mm 3 10
7 Orimet sec 0 5
Workability Criteria for SCC

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SCC Mix

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Quantity : 6 Liters
T
50cmslumpFlow:TimeRequiredtoreach
the500mmcircle.
Min: 2 sec & Max: 5 sec
---------------------------------------------------
SlumpFlow:Thediameterofthe
concreteismeasuredtofindthefilling
ability.
Min Dia.: 650mm &
Max Dia.:800 mm
Slump Flow Test

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Slump Flow Test

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Quantity: 14 Liters
Blocking Ratio:H2/H1
Height H1 &H2 are measured and
H2/H1 ratio is calculated.
The test is to be performed in
5minutes.
Min.: 0.8 & Max.:1.0
L-Box Test

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Quantity: 12 Liters
Recordthetimeforthedischargethe
concretecompletelythroughthetrap
door(theflowtime).
Min: 6 sec &
Max:12 sec
V-Funnel Test

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Quantity: 20 Liters
Calculate : (H1 –H2)
H1–Heightoftheconcreteinthe
compartmentthathasbeenfilled.
H2–Heightoftheconcreteintheother
compartment.
Min. : 0 & Max.: 30 mm
•The test is performed within 5 minutes
U-Box Test

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Quantity: 6 Liters
Measurethedifferenceinheightbetween
theconcretejustinsidethebarsandthat
justoutsidethebarsatfourlocations.
Min: 3 mm &
Max: 10mm
J -Ring Test

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J –Ring Test

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Quantity : 8 Liters
Recordthetimeforthedischargeof
theconcretecompletelythroughthe
trapdoor(theflowtime).
Min: 0 sec &
Max: 5 sec
OrimetTest

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Applications of
Self-Compacting Concrete

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Use of SCC in Slab Element

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Use of SCC in Closely Spaced Reinforced Section

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Application SCC in Congested Reinforced Section

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SCC for Beam Section

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Use of SCC in Closely Spaced Reinforced Section

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