Design Of M30 Grade Self Compacting Concrete Mix With Different Sizes Of Coarse Aggregate

1. DESIGN OF M30 GRADE SCC MIX WITH
DIFFERENT SIZES OF COARSE AGGREGATE
Presented by
K. SURESH
P. PAVAN KUMAR
P. VENUGOPALA RAO
D. SAINATH BABU
G.PRASANTH
E. RAMU

2. Introduction:
 Recent remarkable changes in the construction
environment are demanding improved technology
for the production of high performance concrete with
far greater workability, high strength and long
durability.
 Okamura proposed the concept of self-compacting
concrete in 1986 and the prototype was first
completed in the word in 1988.
 The motive for development of self-compacting
concrete was the social problem on durability of
concrete structures that arose around 1983.

3. Definition Of SCC
Self-compacting concrete is a concrete
that can be compacted into every corner of
a formwork purely by means of its own
weight, with out using any vibrators.
SCC must have the following
characteristics in fresh state:
1. Deformability: The ability of concrete to pass
around and between reinforcement without
blocking, while completely filling the form,

4. 2. Flowability: The ability of concrete to
flow without the use of external
assistance.
3. Segregation resistance: The concrete
must possess enough viscosity to keep all
particles in a unified suspension as to
avoid separation of materials (e.g. avoid
heavy “bleeding”, avoid sinking of coarse
aggregate).

5. Benefits from
SCC:
 Less noise from vibrators and reduced
danger from hand-arm vibration syndrome
(HAVS).
 Speed of placement, resulting in increased
production efficiency.
 Ease of placement, requiring fewer workers
for a particular pour.

6.  Better assurances of adequate consolidation.
 Reduced wear and tear on forms from vibration.
 Reduced wear on mixers due to reduced
shearing action.
 Improved surface quality and fewer bug holes,
requiring fewer patching or "beautification" efforts
can be used in exposed aggregate finishes
increased early strengths.

7.  Reduced energy consumption from
vibration equipment (although the energy
required for longer mix times will offset this
somewhat).
 Reduced permeability.

8. Materials:
 Coarse aggregate
 Fine aggregate
 Cement
 Fly ash
 Super plasticizer
 Water

9. Tests On Fresh SCC:
 Slump flow & T50 test
 L-box test
 V-funnel test & V-funnel at T5minuts

10. Slump Flow & T50 test:
1. Slump flow test is used to find the filling
ability of the SCC.
2. The SCC sample is poured in to the
slump cone then the slump flow diameter
is measured.
3. The flow time is measured & that is know
as T50 slump time.

11. Test Procedure:

12. Acceptability of slump flow:

13. L-box test:
 The L-Box test is used to find the passing
ability of SCC.
 The SCC sample is poured in to the L-Box
apparatus,now the plate is removed to
allow flow.
 The L-box ratio is calculated as H2/ H1.

14. L-Box Test Procedure:

15. V-funnel test and V-funnel test at
T 5minutes:
 The V-Funnel test is used to find the
Segregation Resistance of SCC.
 The SCC sample is poured in to the V-
Funnel apparatus, now its allowed to flow
by its weight.
 The emptying time of V-Funnel is noted.

16. V-Funnel Apparatus:

17. reparation of SCC specimens:
 All the materials are placed in the mixer &
mixed well
 The sample is taken out and poured in to
the moulds.
 The moulds are socked in water & allowed
for curing .

18. Tests on SCC specimens:
 Compressive strength test
 Tensile strength test
• Split cylinder test
• Standard Beam test

19. Acceptance criteria for SCC:
S. No Method Unit Typical Range of Values
Minimum Maximum
1 Slump Flow Test mm 650 800
2 T50cm Slump Flow Sec 2 5
3 V-Funnel Test Sec 6 12
4 V-Funnel at T5minuts Sec 6 15
5 L-Box Test h2/h1 0.8 1.0

20. List Of Workability values:
S.no Size of Slump T50 V-Funnel V-Funnel at L-Box
Aggregate value T5 Minutes H2/H1
1. 20 mm 650 mm 3 Sec 4 Sec 5 Sec 0.79
2. 16 mm 640 mm 4 Sec 4 Sec 5 Sec 0.805
3. 12.5 mm 660 mm 3 Sec 4 Sec 4 Sec 0.82
4. 10 mm 660 mm 4 Sec 3 Sec 4 Sec 0.81

21. Test results of cubes:
S.no Size of Compressive Strength
Aggregate (N/mm2)
3 Days 7 Days
1. 20 mm 14.46 17.47
2. 16 mm 13.22 18.36
3. 12.5 mm 13.45 18.46
4. 10 mm 13.75 19.25

22. Test results of Beams:
S.no Size of Flexural Strength
Aggregate (N/mm2)
3 Days 7 Days
1. 20 mm 2.46 2.90
2. 16 mm 2.84 3.16
3. 12.5 mm 2.95 4.25
4. 10 mm 3.33 4.20

23. Test results of cylinders:
S.no Size of Split Tensile Strength
Aggregate (N/mm2)
3 Days 7 Days
1. 20 mm 1.13 1.125
2. 16 mm 0.99 1.125
3. 12.5 mm 0.85 1.132
4. 10 mm 0.92 1.132

24. Conclusions:
1. After committing various trail tests, we have finally achieved M30
grade self compacting concrete for different sizes of coarse
aggregates which could satisfy all the SCC characteristics such
as flowability, passing ability and segregation resistance given by
European standards. As there are no Indian standards,
comparison could not be made.
2. From the observations it was found that nearly half of the
compressive strength is gained in 3 days and 2/3 rd of the
strength in 7 days curing which satisfies IS: 456-2000.
3. It was also observed that flexural strength of SCC has attained
the permissible values for 3 days and 7 days as per IS: 456-2000.
4. Finally we conclude that with the help of workability and strength
characters we got M30 grade mix proportion for different sizes of
coarse aggregate.

25. Bibliography:
1. Brain Paulson. EFNARC, Secretary General, ‘Specifications and
Guidelines for Self-Compacting Concrete”, February 2002.
2. Nan Su, K.C. Hsu, H.W. Chai. A Simple mix design method for
self-compacting concrete, cement and concrete Research 2001.
3. 3.Okamura.H.‘Self-Compacting High Performance Concrete’,
Concrete International, Vol. 19, No.7, pp. 50-54, July 1997
4. 4. M.S. Shetty. “Concrete technology (theory and practice), S.
Chand & Company LTD. 2002
5. IS 456-2000 Code of practice for plain and reinforced concrete (3 rd
revision)
6. 16. IS 516-1959 Method of test for strength of concrete

26. Thanque
[ksnvarma@yahoo.com (or)
ksnvarma@gmail.com ]