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1. SELF COMPACTING CONCRETE
MIX DESIGN [IS 10262-2019]
SHIVAPRASAD RAJOOR
Structural Engineer (M.Tech.)

2. STEPS
1) TARGET STRENGTH FOR MIX PROPORTIONING
2) APPROXIMATE AIR CONTENT
3) SELECTION OF WATER-CEMENT RATIO
4) SELECTION OF WATER CONTENT AND CEMENT/FLY ASH
CONTENT
5) SELECTION OF ADMIXTURE CONTENT
6) SELECTION OF POWDER CONTENT AND FINE AGGREGATE
CONTENT
7) SELECTION OF COARSE AGGREGATE CONTENT
8) CALCULATION OF VOLUME OF POWDER CONTENT

3. Important Note
 Powder content
 Water content
 Super plasticizer

4.  fck = 30 N/mm2
OPC 43 grade cement
Max. cement content 450 kg/m3
 Specific gravity

5. f’ck = fck+1.65 S
or
f’ck = fck + X
whichever is higher
where
f’ck = target average compressive
strength at
28 days,
fck = characteristic compressive
strength at
28 days,
S = standard deviation, and
X = factor based on grade of
concrete
TARGET STRENGTH FOR
MIX PROPORTIONING
STEP
STEP1

6. f’ck = fck+1.65 S
f’ck = 30 + 1.65 * 5
=38.25 N/mm2
fck = 30 N/mm2
S= 5
f’ck = fck + X X= 6.5
f’ck = 30+6.5
= 36.5 N/mm2
The higher value is to be adopted.
Therefore,
target strength will be 38.25 N/mm2
as 38.25 N/mm2 > 36.5 N/mm2.

7. APPROXIMATE AIR
CONTENT
Nominal maximum size of
aggregate = 20 mm
From Table 3, the approximate amount
of entrapped air to be expected in
normal (non-air-entrained) concrete is
1.0 percent for 20 mm nominal
maximum size of aggregate.
STEP2

8. SELECTION OF WATER-
CEMENT RATIO
Cement OPC 43 grade
‘severe’ exposure
Reinforced concrete
From Fig. 1, the free water
cement ratio required for the
target strength of 38.25 N/mm2
is 0.43 for OPC 43 grade curve.
STEP3

9. M30
for ‘severe’ exposure for reinforced concrete
From Table 5 of IS 456
The maximum water-cement ratio 0.45
0.43< 0.45, hence O.K.

10.  PROPORTIONING FOR INITIAL MIX
Selection of Water Content and Cement/Fly Ash Content
slump flow between 750 and 850 mm
From clause 8.3
water content of 190 kg/m3 along with a superplasticizer
@ 0.6 percent by mass of cementitious material content
is selected for the initial mix
W/C = 0.43
W =190 kg/m3
C= 190/0.43
C = 442 kg/m3
Assume 35% of fly ash admixture
•Fly ash content
442*(35/100)= 155 kg/m3
•OPC content
442-155 = 287 kg/m3
STEP4

11. Admixture content
= 0.6/100 × 442 = 2.65 kg/m3
Selection of Admixture Content
Taking an admixture dose of 0.6
percent by mass of cementitious
material, the mass admixture
STEP5

12. Selection of Powder Content and Fine Aggregate Content
The powder content (fines < 0.125 mm) required for SCC is
generally in the range of 400 to 600 kg/m3
Therefore a powder content of 520 kg/m3 is selected
Fines required to be contributed by fine aggregate =
Total powder content – (Fly ash content + cement content)
= 520 – (155 + 287) = 78 kg/m3
The fine aggregate has 8 percent materials < 0.125 mm (see 8.1).
Therefore, the fine aggregate quantity = 78/0.08 = 975 kg/m3.
STEP6

13. Let Vca be the volume of coarse aggregate
Assuming 1 m3 of concrete,
Volume = total content per m3 / (Sp. Gravity * 1000)
Vca = (1 - Air content) - (Vol of water + Vol of cement + Vol of fly ash + Vol of
admixture + Volume of fine aggregate)
Vca = (1-0.01) – ( (190/(1*1000)) + (287/(3.15*1000)) + (15/(2.2*1000)) +
(2.65/(1.08*1000)) + (975/(2.65*1000)) )
Vca = 0.99 – (0.19 + 0.091 + 0.07 + 0.002 5 + 0.368)
= 0.269 m3
Mass of coarse aggregate
= Vca x specific gravity of coarse aggregate × 1 000
= 0.268 × 2.74 × 1 000
= 737.06 kg/m3 ≈ 737 kg/m3
Selection of Coarse Aggregate Content
STEP7

14. Vol of powder content = Vol of OPC + Vol of fly ash + Vol of portion of fine
aggregate < 0.125 mm
= ((287/(3.15*1000)) + (155/(2.2*1000)) + (78/(2.65*1000))
= 0.191 m3
Ratio of water to powder by volume
= 0.190/ 0.191 = 0.99
Calculation of Volume of Powder Content
NOTE — The water to powder ratio is expected to be
between 0.85 and 1.10.
STEP8

15. 1. Cement = 287 kg/m3
2. Fly-ash = 155 kg/m3
3. Water (net mixing) = 190 kg/m3
4. Fine aggregate (SSD ) = 975
kg/m3
5. Coarse aggregate (SSD) = 737
kg/m3
6. Chemical admixture = 2.65 kg/m3
7. Free water-cement ratio = 0.43
8. Powder content = 520 kg/m3
MIX PROPORTIONS FOR TRIAL