VENAD READYMIX CONCRETE PVT LTD

MANALELPPADY , THOTTACKAD P.O

KOTTAYAM, KERALA 686539
EMAIL :- sales@venadconcrete.com
www.venadconcrete.com
Mob : 7591966111 , 7593814500

CONCRETE MIX PROPORTIONING [Ref: IS 10262 - 2019 & IS 456 ]

CLIENT : TBAS CONSTRUCTIONS GRADE : M 35

SITE : KIIDC PROJECT ALAPPUZHA DATE : 30-10-2024

DESIGN STIPULATION

a) Concrete Grade Designation 35

b) Type of Cement OPC 43 Grade Conforming to lS 12269
c) Maximum Nominal Size of Aggregate 20 mm
320 Kg/m³ (The maximum cement content shall be 450 kg/m3.
Minimum Cement Content as per Table 3 and Table 5 of IS However,with proper mix design and use of proper admixtures
d)
456 the cement content may be reduced but in no case the cement
content shall be less than 320 kg/m3)
e) Maximum Nominal Water Cement Ratio as per IS 456-2000
Requirement of Concrete for Very Severe Exposure 0.50
Condition using 20 mm Aggregate
f) Minimum Cement content Specified as per the Drawing 320
Maximum Water-Cement Ratio Specified as per the
g) 0.50
Drawing.
h) Maximum Cement Content not Including Fly ash 400 kg/m3
i) Workability at Site as per IS 2911(Part/sec-2)-2010 100 to 125 mm
j) Exposure condition Moderate
k) Degree of Supervision Good
l) Type of aggregate Crushed Angular Aggregate
m) Chemical Admixture Type Superplasticiser [ Confirming to IS 9103]
TEST DATA FOR MATERIALS
a) Cement used ZUARI OPC 43
b) Specific Gravity of Cement 3.1
c) Chemical Admixture AURAMIX 400
d) Specific Gravity of 20 mm Aggregate [SSD] 2.78
e) Specific Gravity of 12.5 mm Aggregate [SSD] 2.97
f) Specific gravity of Fine aggregate [SSD] 2.56
g) Specific Gravity of Admixture 1.15
Requirement as per IS:383-2016
WATER ABSORPTION
a) 20 mm Aggregate 0.80%
b) 12.5 mm Aggregate 0.70%
c) Fine Aggregate 1.80% Max . 5%
FREE SURFACE MOISTURE
a) Coarse Aggregate 20MM 0.83 %
b) Coarse Aggregate 12.5 0.81 %
c) Fine Aggregate 5.0 %
TARGET MEAN STRENGTH
[Standard Deviation Obtained from Table 1 IS 10262:2019]

f 'ck = Target mean compressive Strength at 28 days, in N/mm2 f ck + 1.65 S

2
f ck = Characteristic compressive Strength at 28 days, in N/mm OR
S = Standard Deviation in N/mm2 f ck + X
X = Factor Based on the Grade of Concrete,as per Table 1 [Whichever is higher ]
2
43.25 N/mm
Page 1 of 4
SELECTION OF WATER CEMENT RATIO AND MINIMUM CEMENT CONTENT
Maximum Nominal Water Cement ratio as per IS 456-2000
Requirement of Concrete for Very Severe Exposure 0.55
Condition using 20 mm Aggregate.
Adopted Water Cement Ratio Based on Experience 0.50
Minimum Cement Content as per IS 2911(Part/sec-1)-2010 350 Kg/m³ [The minimum Cement Content shall be 400
CALCULATION OF WATER CONTENT

From Table 4 of IS 10262-2009, Maximum water per cubic

186 Liters [25-50mm Slump]
meter of Concrete for 20mm Maximum Size Aggregates

Additional Water for 75mm Slump @ 3% of 186

186+3/100x186
litre for Every 25mm Slump

Estimated Water Content for 75 mm Slump 191.58 Litres

Adding Superplasticiser at Suitable Dosage, the
25 % 0.83
Water Content can be Reduced by
Then,Reduced Water Content 159.60 Litres
CALCULATION OF CEMENT CONTENT
Water Cementitious Ratio Adopted 0.38
Water content/m³
159.60 Litres
Therefore, Cement required/m³
Say,Cement Fixed 420 Kg.
PROPORTION OF VOLUME OF COARSE AGGREGATE AND FINE AGGREGATE

Volume of Coarse Aggregate 60 %

Volume of Fine Aggregate 40 %

COMPUTATION OF MIX PROPORTION

Absolute volume of concrete in ltrs. 1.000

From Table 3 of 19 10262-2019, the approximate amount of
entrapped air to be expected in normal (non-air-entrained)
0.01
concrete is 1.0 percent for 20mm nominal maxirnum size of
aggregates.
Volume of Cement 420 /3.10/1000 0.133
Volume of PFA 0 /2.2/1000 0.000
Volume of Water = 160 /1000 0.160
Volume of Adm. 0.30 x 1.3 /1.25/1000 (negligible) 0.0011
Volume of aggregate 0.696
Mass of Coarse Aggregate = 0.690 x 0.58 x (2.78+2.97)/2 x 1000 1200.55
Mass of Fine Aggregate = 0.690 x 0.42 x 2.56 x 1000 712.67
Mass of 20mm 60 % of Coarse Aggregate 720.33
Mass of 12.5mm 40 % of Coarse Aggregate 480.22

QUANTITY OF MATERIALS FOR 1 CUM

CEMENT 420.00 Kg
COARSE AGGREGATE 20 mm 720.33 Kg
COARSE AGGREGATE 12.5 mm 480.22 Kg
FINE AGGREGATE 712.67 Kg
WATER 159.60 Kg
ADMIXTURE 0.30 % 1.26 Kg

TOTAL 2494.08 kg/m³

Page 2 of 4
 SIEVE ANALYSIS

20 mm Aggregate Conforming to Table 7 based on IS 383-2016

Source of Supply COCHIN BLUE METALS Weight of Sample ( gm.) 5000

IS Sieve Cumulative %
Weight Retained (gm) % weight Retained % Passing Limit
Designation Retained
25 0 0 0 100 100
20 68 1.36 1.36 98.64 85-100
12.5 3426 68.52 69.88 30.12
10 997 19.94 89.82 10.18 0-20
4.75 385 7.70 97.52 2.48 0-5
Pan 124 2.48 100.00 0.00
5000

12.5 mm Aggregate Conforming to Table 7 based on IS 383-2016

Source of Supply COCHIN BLUE METALS Weight of Sample ( gm.) 5000

IS Sieve Cumulative %
Weight Retained (gm) % weight Retained % Passing Limit
Designation Retained
16 0 0 0 100 100
12.5 356 7.12 7.12 92.88 85-100
10 3241 64.82 71.94 28.06 0-45
4.75 1319 26.38 98.32 1.68 0-10
Pan 84
5000

Fine Aggregate Conforming to Grading Zone Based on Table 9 of IS 383-2016

Source of Supply COCHIN BLUE METALS Weight of Sample ( gm.) 1000

IS Sieve Cumulative %
Weight Retained (gm) % weight Retained % Passing Limit
Designation Retained
10 0 0 0 100 100
4.75 3 0.30 0.30 99.70 90-100
2.36 234 23.4 23.70 76.30 75-100
1.18 260 26 49.70 50.30 55-90
600 135 13.5 63.20 36.80 35-59
300 101 10.1 73.30 26.70 8-30.
150 157 15.7 89.00 11.00 0-10
PAN 110 11 100.00 0.0
1000

Combined Gradation for the Combined Proportion of 20 mm and 12 mm Aggregates

Materials
Specified limit as per IS 383-2016
Sieve size 20mm 12 mm Sample Combined Grading and MORTH based on
% Passing proportion Maximum nominal size aggregate
% passing % passing
proportion proportion 55% 45%
40 100 100 50.00 50.00 100.00 100
20 98.64 0 0.00 44.39 44.39 95-100
10 28.06 28 15.43 12.6 28.06 25-55
4.75 2.48 1.68 1.36 0.76 2.12 0-10

Page 3 of 4
 All in Aggregate Grading Based on Table 10 of IS 383

Sieve Sample Specified (Proj. Spec, RCC) Combined Aggregate Gradation %

Materials
size Combine passing.
20mm 12 mm Sand
% proportio % propo Proport d grading
IS passing n passing rtion % passing ion Spec Max. Spec Min.

40 100 35 100 25 100 40 100 100 100

20 98.64 35 0.00 25 100 40 75 100 95
4.75 10.18 35 1.68 25 99.70 40 44 50 30
600 0 35 0 25 36.80 40 15 35 10
150 0 35 0 25 11.00 40 4 6 0

120

100 100
98.42296512 100
95
80

60
50
40 39.09554914
35
30
20 18.183
10
6
3.686
0 0
0.1 1 maximum minimum design
10 100

NOTE:

* Subject to availability, Minor Changes in Mix Design parameters will be made according to Brand & Grade
of cement and as per routine tests on Aggregates.
* New Admixtures when and as approved by VENAD R & D will be used with appropriate changes in Design Parameters.
* Adjustments for moisture content in aggregates will be done at the time of batching.
* Admixture dosage and total water will be adjusted based on the climatic condition and slupm requierment at site.
* Extra water[Absorption] to be added if absolutely dry aggregates are used.
* Test result are based on the properties of meterials received.

QC - IN CHARGE …..
ADITHYAN V V

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