SELF-COMPACTING CONCRETE (SCC)

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Dr. Shrishail B. 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)?
 It is flowing concrete mix that does
not require additional
(external)work for consolidation.
 Consolidates under its own weight.

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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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• In 1983 the problem of the durability of concrete structure was major topic of interest in
Japan
• The creation of durable concrete structures requires adequate compaction by skilled
workers
• The necessary of this type of concrete was proposed by Okamura in 1986
• By the early 1990’s Japan has developed and used SCC
• Studies to develop SCC have been carried by Ozawa and Melawi at the University of Tokyo
• As of the year 2000, SCC used for Prefabricated products (Precast members) and ready
mixed concrete (cast-in-situ) in Japan, USA and later on India
• Present day SCC can be classified as an advanced construction material or Special Concrete
Development Of SCC

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 Filling ability: The ability of SCC to flow into and fill completely all spaces within the
formwork, under its own weight.
 Passing ability: The ability of SCC to flow through tight opening such as spaces between steel
reinforcing bars without segregation or blocking.
 Segregation resistance: The distribution of aggregate particles remains homogeneous in both
vertical and horizontal direction.
Static segregation: due to gravity, vertical direction
Dynamic Segregation: due to flow, horizontal direction
Basic Properties of SCC

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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 Compactability of 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
 Cementitious Materials 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 Aggregate
Water
Cement

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Cement:
All types of cement can be used
Typical cement content: 350 to 450 kg/m3
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:
They are essential components of Self Compacting Concrete.
Sulphonated melamine formaldehyde, Napthalane formaldehyde
condensate and Polycarboxylic either base superplasticizers are
commonly used.
The water reduction should be more than 25% allowing for total
water content of 160 to 180 lit/m3 in the concrete mix.
Type and quality of Ingredients

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Large quantity of fines(500 to 650 kg/m3)
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
T50cm Slump flow T50cm Slump 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 T5sec V funnel test T5sec
Self-Compatibility Evaluation

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Sl. No Method Units Recommended range
Min. Max.
1 Slump Flow mm 650 800
2 T50cm slump 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
T50cm slump Flow: Time Required to reach
the 500mm circle.
Min: 2 sec & Max: 5 sec
---------------------------------------------------
Slump Flow: The diameter of the
concrete is measured to find the filling
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
Record the time for the discharge the
concrete completely through the trap
door (the flow time).
Min: 6 sec &
Max:12 sec
V- Funnel Test

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Quantity: 20 Liters
Calculate : (H1 – H2)
H1 – Height of the concrete in the
compartment that has been filled.
H2 – Height of the concrete in the other
compartment.
Min. : 0 & Max.: 30 mm
• The test is performed within 5 minutes
U-Box Test

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Quantity: 6 Liters
Measure the difference in height between
the concrete just inside the bars and that
just outside the bars at four locations.
Min: 3 mm &
Max: 10mm
J - Ring Test

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J – Ring Test

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Quantity : 8 Liters
Record the time for the discharge of
the concrete completely through the
trap door (the flow time).
Min: 0 sec &
Max: 5 sec
Orimet Test

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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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YOU