Concrete Mix Design - IS 10262-2019 - .pptx

INDIAN STANDARD
CONCRETE MIX PROPORTIONING GUIDELINES
IS 10262-2019

REFERRED STANDARDS
IS Codes Title
269:2015 Specification for Ordinary Portland cement( 6th Revision)
383 : 2016 Specification for coarse and fine aggregates from natural sources for concrete (3rd Revision)
456 : 2000 Code of practice for ‘Plain and reinforced concrete’ (4th Revision).
1199- 2018 Fresh concrete – Methods of sampling, testing & analysis (Part -6)
2386 : 1963
(Pt 3)
Methods of test for aggregates for concrete: Part 3 Specific gravity, density, voids, absorption and
bulking
1489 : 2015
(Pt 1 & 2)
Specification for Portland pozzolana cement : Part 1 For fly ash based and part 2 calcined clay
based, cement mortar and concrete (second revision)
3812:2013 (Pt 1) Specification for fly ash in cement, cement mortar and concrete(2th Revision)
9103 : 1999 Specification for admixtures for concrete (1st revision)
15388 - 2003 Specifications for Silica Fumes
16714 – 2018 Ground Granulated Blast Furnace Slag for use in Cement, Mortar & Concrete - Specifications

IS:10262 – 2009 IS:10262 – 2019
The scope of this
standard was very
limited without giving
due considerations to
many factors & recent
developments
affecting the concrete
mix proportioning.
The scope of the standard has been enlarged to include different types & grade of concrete giving due
considerations to various other important factors
The standard has been divided to 5 major sections to include: General terms & conditions in a detailed
manner, Design of ordinary & standard grades of concrete, HSC (M65 – M100), SCC & Mass concrete
Initial data to be provided for mix proportioning has been made more encompassing by including the
provisions of IS:383-2016, usage of admixtures
Formula for Target Mean Strength has been refined to include new factor based on grade of concrete
so as to ensure minimum margin between Characteristic strength & target mean strength.
Calculations of Standard deviation has been detailed
A graph of w/c ratio verses 28-D compressive strength of concrete has been introduced for OPC, PPC &
PSC for assuming initial w/c ratio.
The standard was
applicable only for
ordinary & standard
grades of concrete up
to M55.
Illustrative examples for mix proportioning of concrete using PPC, OPC+fly ash, OPC+ GGBS, HSC, SCC &
mass concrete has been included.
Guidelines for usage of water reducing admixture has been introduced as an informatory annex
Consideration of Air Content has been re-introduced in the design of normal (non-air entrained)
concrete mix.
Overview of Major Modifications in IS:10262 - 2019

• First published - 1982
• 1ST Revision – 2009
• 2ND Revision - 2019
The standard has been divided into five sections as given below:
• General
• Ordinary and Standard grades of concrete
• High strength grades of concrete
• Self Compacting Concrete
• Mass Concrete
MAJOR MODIFICATIONS MADE IN REVISED 2019 VERSION

Relation between free water-cement ratio and 28 days Compressive strength of Concrete

A graph with 3 curve depicting the relationship between 28-days compressive strength of concrete &
w/c ratio has been introduced for working out free w/c.
• Curve 1 – For expected cement 28-D strength of 33 and < 43 MPa,
• Curve 2 - For expected cement 28-D strength of 43 and < 53 MPa
• Curve 3 - For expected cement 28-D strength > 53 MPa
• In absence of actual cement strength Curve 1, 2 & 3 may be used for OPC33, OPC43 &
OPC53 grade cements respectively
• While using PPC/PSC, if actual cement strength is available then any curve can be used based
on the actual strength
• In absence of actual cement strength of PPC/PSC, use Curve 2.
.
MAJOR MODIFICATIONS MADE IN REVISED 2019 VERSION Contd…

• Reduce by 10 kg for sub-angular aggregates,
• Reduce by 15 kg for gravel with some crushed particles (Earlier it was 20 kg)
• Reduce by 20 kg for rounded gravel (Earlier it was 25 kg) to produce same
workability.
The adjustments to be made in the water content (For 50mm slump) given in Table-4 for
different shapes of aggregates has been revised as follows;
MAJOR MODIFICATIONS MADE IN REVISED 2019 VERSION Contd…

HIGH STRENGTH CONCRETE (GRADE M 65 AND ABOVE)
 Procedure to attain HSC is similar to that of ordinary/standard strength concrete.
 Quality of aggregates for HSC.
o coarse aggregate shall be strong, sufficiently sound, free of fissures or weak planes,
clean and free of surface coating and shall meet the requirement of IS:383
Parameter Requirement
Impact/crushing value < 22 percent
Combined Flakiness & Elongation
Index
< 30 percent
Nominal MSA < 20 mm for up to M75
Nominal MSA Preferred 10 & 12.5 mm for M80 & above
Fine Aggregate Coarser size is preferred (Zone I or Zone II)

Air Content – Standard Concrete Air Content – High Strength Concrete

Selection of Water Content without Chemical Admixture–

Selection of W/C Ratio

• The clause has been made more elaborate to take into consideration the
usage of multiple SCM/MA like FA, GGBS, SF & others for part cement
replacement. It has allowed for increase in cementitious material content
under such conditions, based on experience or by 10% for preliminary trial
• The limits of addition of FA & GGBS are kept open based on the project
requirement and the quality of these materials.
HSC - Calculation of Cement/Cementitious Materials Content

HSC - Recommended Dosage of 04 Mineral Admixtures Materials (FA, GGBS, SF & MK)

HSC - coarse aggregate volume per unit volume of total aggregate
Reduce the estimated CA content by 5% for pumpable concrete &
concrete used in congested reinforcements.

SELF COMPACTING CONCRETE
It has been divided into different classes based on slump flow. Segregation resistance &
viscosity for different areas of application
Typical Range of Mix Constituents –
• Fines content (Particles < 125 micron) – 400-600 kg/m3
• Fine Aggregate Content – 48-60 % by mass of total aggregates
• Water Content – 150 – 210 kg/m3

Data Required
Target Mean Strength
Water-Cement Ratio
Water Content
Cement Content
Coarse Aggregate proportion
Fine Aggregate proportion
Ingredients per unit Vol. of
Concrete
Steps involved
- At a Glance

STEP 1 DATA REQUIRED FOR CONCRETE MIX DESIGN
a) Grade designation
b) Type of cement
c) Maximum nominal Size of Aggregate
d) Minimum cement/cementitious material content
e) Maximum water-cement ratio
f) Workability
g) Exposure conditions as per IS 456 - Table 4 & 5
h) Maximum temperature of concrete at the time of placing
i) Method of transportation & placing
j) Early age strength requirements, if required
k) Type of aggregate
l) Maximum Cement Content
m) Admixture requirements & dosage

STEP 2 TEST DATA FOR MATERIALS
a) Cement- Type & its specific gravity
b) Fly ash
• Specific gravity (Sg F)
c) Coarse Aggregates
• Specific Gravity (Sg CA)
• Water absorption
• Free (surface) moisture
d) Fine Aggregates
• Specific Gravity (Sg FA)
• Water absorption
• Free (surface) moisture
e) Sieve Analysis – Conforming zone
f) Chemical admixture

GRADING LIMITS OF COARSE AGGREGATES (Table 2 of IS 383)
IS Sieve
(mm)
% passing for Single sized aggregate of Nominal size
% passing for Graded sized aggregate of Nominal
size
63
mm
40
mm
20
mm
16
mm
12.5
mm
10
mm
40
mm
20
mm
16
mm
12.5
mm
80 100 - - - - - 100 - - -
63 85-100 100 - - - - - - - -
40 0-30 85-100 100 - - - 95-100 100 - -
20 0-50 0-20 85-100 100 - - 30-70 95-100 100 100
16 - - - 85-100 100 - - 90-100 -
12.5 - - - - 85-100 100 - - - 90-100
10.0 0-5 0-5 0-20 0-30 0-45
85-
100
10-35 25-55 30-70 40-85
4.75 - - 0-5 0-5 0-10 0-20 0-5 0-10 0-10 0-10
2.36 - - - - 0-5 - - - -

GRADING LIMITS OF FINE AGGREGATES (Table 4 of IS 383 )
IS Sieve
(mm)
Percentage Passing for
Grading
Zone I
Grading
Zone II
Grading
Zone III
Grading
Zone IV
10 100 100 100 100
4.75 90-100 90-100 90-100 95-100
2.36 60-95 75-100 85-100 95-100
1.18 30-70 55-90 75-100 90-100
0.006 15-34 35-59 60-79 80-100
0.003 5-20 8-30 12-40 15-50
0.0015 0-10 0-10 0-10 0-15

STEP 3 TARGET STRENGTH FOR CONCRETE MIX DESIGN
Target Mean Strength (f’ck) = fck + (1.65 * s) OR Target Mean Strength ( f’ck) =fck + x
f’ck – target mean compressive strength at 28 days in N/mm²
fck – characteristic compressive strength at 28 days in N/mm²
s – standard deviation, based on degree of quality control adopted at site (Ref.
Table-2)
X - Factor based on grade of concrete (Ref. Table -1)
Note -- Adopt higher value for target mean strength

Grade of
Concrete
Value of X
M10
5.0
M15
M20
5.5
M25
M30
6.5
M35
M40
M45
M50
M55
M 60
Table 1- Value of X (clause 4.2)
Grade of
Concrete
Value of X
M65
8
M70
M75
M80

• Note - Values correspond to site control having proper Weigh batching of materials, Proper cement storage, controlled addition of water, Regular aggregate
testing, Periodic strength & workability tests .
• Any deviations from the above Site control, the values given in the above table shall be increased by 1N/mm²
Grade of Concrete
Assumed Standard Deviation
(N/mm²)
M10
3.5
M15
M20
4.0
M25
M30
5.0
M35
M40
M45
M50
M55
M 60
Grade of
Concrete
Assumed Standard
Deviation (N/mm²)
M65
6.0
M70
M75
M80
Table 2 - Assumed Standard Deviation (clause 4.2.1.3)

• Note - The actual values of air content can also be adopted during mix proportioning ,if site data of similar mix is
available
Max. Size of
Aggregate
Entrapped Air ,as
percentage of Vol. of
Concrete
10 1.5
20 1.0
40 0.8
Table 3 – Approx. Air Content
The approximate amount of entrapped air to be expected in a normal
concrete can be noted using the following table
Air Entrainment Meter

STEP 4 SELECTION OF WATER-CEMENT RATIO
• Select the water-cement ratio from the relationship established between strength and
free water-cement ratio for the materials actually used OR select preliminary free
water-cement ratio corresponding to 28 day target strength OR;
• Preliminarily, find out the Maximum water-cement ratio from Table 2 (Table 5 of IS
456:2000) based on the environment exposure condition.
• The above water-cement ratio should be checked against the limiting water-cement
ratio for the durability requirements.
• Adopt lower of the two values.

Fig.1 Relation between free water-cement ratio and 28 Compressive
strength of Concrete

Table – 5 of IS 456 Min Cement Content, Max w/c & Min Grade of Concrete for Different
Exposures with Normal Weight Aggregates of 20mm Nominal MSA
Sl.
No.
Exposure
Conditions
Plain Concrete Reinforced Concrete
Minimum
Cement
Content
kg/m³
Maximum
Free
W/C ratio
Minimum
Grade of
Concrete
Minimum
Cement
Content
kg/m³
Maximum
Free
w/c ratio
Minimum
Grade of
Concrete
1. Mild 220 0.6 -- 300 0.55 M 20
2. Moderate 240 0.6 M 15 300 0.5 M 25
3. Severe 250 0.5 M 20 320 0.45 M 30
4. Very Severe 260 0.45 M 20 340 0.45 M 35
5. Extreme 280 0.40 M 25 360 0.4 M 40

STEP 5 SELECTION OF WATER CONTENT
Table 4 - Maximum Water Content for different Nominal MSA
Nominal MSA (mm) Maximum Water Content per m3 of Concrete for MSA of
CA (kg)
10 208
20 186
40 165
• Saturated surface dry aggregates
• Angular coarse aggregate and
• Slump of 50mm
The above data holds good for:

STEP 5 SELECTION OF WATER CONTENT
CORRECTIONS TO BE APPLIED ON WATER CONTENT –
I) Based on aggregates : Reduction in water content
Type of aggregate Reduction of water content(%)
i) Sub-angular 10 kg
ii) Gravel with crushed particles 15 kg
iii) Rounded gravel 20 kg
II) Based on slump : Increase in water content
For slump other than 50mm,
Increase/Decrease the water content by 3% for every 25mm Increase/Decrease in slump.
III) Use of Admixtures : Reduction in water content
Water reducing admixtures – 5 to 10%
Super plasticizers – 20-30%

STEP 6 CALCULATION OF CEMENT CONTENT
• Calculate the cement content per unit vol. of concrete from the water-cement ratio
obtained in Step 4.
• Check cement content against the min. cement content for the requirements of
durability under various conditions of exposure (Ref – Table 5 of IS 456 : 2000)
• Adopt Greater of the two values.
• Maximum Cement content shall be in accordance with IS 456 Clause 8.2.4.2.

STEP 7 ESTIMATION OF COARSE & FINE AGGREGATE PROPORTION

STEP 7 ESTIMATION OF COARSE AGGREGATE PROPORTION
CORRECTIONS TO BE APPLIED –
• For water ratio other than 0.50,
- For every 0.05 increase in w/c, decrease the proportion of vol. of CA by 0.01;
- For every 0.05 decrease in w/c, increase the proportion of vol. of CA by 0.01.
• For pumpable concrete, reduce the volume of coarse aggregates by 10%

COMBINATION OF DIFFERENT COARSE AGGREGATES FRACTIONS
Coarse aggregates of different sizes may be combined in suitable proportions so as
to result in an overall grading conforming to Table2 of IS383 for particular nominal
MSA
ESTIMATION OF FINE AGGREGATE PROPORTION
Vol. of Fine aggregates = 1 – Vol. of Coarse aggregate

STEP 8 MIX CALCULATIONS
Vol. of the Cementitious material, water and admixture are obtained by
Volume of all in aggregates = Vol. of Concrete – (Vol. of Cement
+Vol. of water + Vol. of admixture)
(if used)
Mass of coarse aggregate = Vol. of all in aggregate X the Vol. of
CA X Sp. gravity of CA X 1000
Mass of Fine aggregate = Vol. of all in aggregate X the Vol. of
FA X Sp. gravity of FA X 1000
Mass of resp. materials X 1
Specific gravity of resp. materials 1000

The proportion of all the ingredients should be presented.
Cement –
Fly ash -
Water –
Fine aggregates –
Coarse aggregates –
Chemical admixtures –
Note – All the aggregates considered are in saturated surface dry condition. If aggregates in any other condition are
used, following allowances should be made.
• Allowance for free (surface) moisture contributed by the CA and FA should be considered while calculating the
requirement for the mixing water.
• If aggregates are dry, the amount of mixing water should be increased by an amount equal to the moisture likely to
be absorbed by the aggregates.
• Adjustments are also required to be made in the mass of aggregates.
STEP 9 MIX PROPORTIONING

• Slump of Trial Mix No.1 shall be measured, it shall be observed for segregation,
bleeding and finishing properties.
• If the measured slump of Trail Mix No. 1 is different from the stipulated value, the
water and/or admixture content shall be adjusted suitably.
• The mix proportion considering the above adjustment shall be recalculated keeping
the free water-cement ratio at the pre-selected value. This shall be Trial Mix No.2.
• Two more Trial Mixes No.3 and No.4 shall be made by varying the free water-
cement ratio by ± 10% of the preselected value.
STEP 10 TRAIL MIXES

A1. Data Required For Mix Design
i. Grade designation - M 30
ii. Type of cement - OPC (IS 269 –2015)
iii. Type of mineral Admixture - Fly ash( IS 3812-2013)
iv. Maximum nominal Size of Aggregate- 20mm
v. Exposure conditions - Moderate
vi. Minimum cement content - 300 kg/m³
vii. Maximum water-cement ratio - 0.50
viii.Workability - 75 – 100 mm
ix. Type of aggregate - Crushed angular
x. Maximum Cement Content - 450kg/m³
xi. Chemical Admixture - Super Plasticizer
xii. Degree of supervision - Good
Example 1 : MIX PROPORTIONING FOR CONCRETE OF GRADE M30

A2. Test Data for Materials
a) Cement
. Specific gravity - 3.15
b) Fly ash
• Specific gravity - 2.20
c) Coarse Aggregates
• Specific Gravity - 2.68
• Water absorption - 0.5%
• Free (surface) moisture - Nil
d) Fine Aggregates
• Specific Gravity - 2.66
• Water absorption - 1.0%
• Free (surface) moisture - 2.0%
e) Chemical Admixture
. Specific Gravity - 1.1

d) Sieve Analysis - COARSE AGGREGATES
IS sieve size
(mm)
% passing % Passing of Different fractions
CA1 CA2
CA1
(60%)
CA2
(40%)
Combined
(100%)
20 93.5 100 56.1 40 96.1
10 16.5 88.2 9.9 35.3 45.2
4.75 1.2 9.40 0.7 3.70 4.70
2.36 - 0 - - -

d) Sieve Analysis - FINE AGGREGATES (confirming to Table 4 of IS 383 )
Fine Aggregates confirm to Zone II
IS sieve size (mm) % passing
4.75 100
2.36 93.2
1.18 76.6
0.6 41.4
0.3 12.4
0.15 3.5

From Table 1, standard deviation s = 5 N/mm²
Target Mean Strength (f’ck) = fck + (1.65 s)
= 30 + (1.65 X 5) =38.25 N/mm2
B1. Target Mean Strength
OR
Target Mean Strength( F’ck) = Fck + X
=30+6.5 = 36.5 N/mm2
B2. Selection Of Water-cement Ratio
From Table 2, maximum w/c = 0.50, Based on Graph or experience adopt 0.45.
0.45< 0.50. Hence Ok.

From Table 4, water content = 186 litre
(for 20mm aggregate 50mm slump)
For 100mm slump , correction needs to be applied, i.e. increase water content by 6%
Water content for 100mm slump = 186 + (6/100) X 186
= 197.2 litre
As superplasticizer is used, the water content can be reduced by 20% and above.
Based on trials, water content reduction of 15% has been achieved. Hence, water content
= 197.2 X 0.85
= 167.6 litres
B3. Selection of water content

B4. Calculation of cement content
From step 4, adopted w/c = 0.45
From step 5, water content = 167.6 litres
 Cement = 167.6/0.45 = 372.4 kg/m³
Check
From Table 2, for ‘Moderate’ exposure condition, Minimum cement
content = 300kg/m³
372.4 kg/m³ > 300kg/m³, Hence OK.

Calculation of Fly ash content
Fly ash content of total Cementitious material = 30%
Qty of Fly ash content of total Cementitious material = 373 x 30% = 112 kg/m³
Cement OPC = 373 – 112 = 261 kg/m³
Cement (OPC) = 261kg/m³
Fly ash = 112 kg/m³

B5. Vol. of CA and FA Content
From Table-4, volume of coarse aggregate corresponding to 20 mm size aggregates & fine
aggregate (Zone II) for w/c 0.50 = 0.62
As the water cement ratio is lower by 0.05, the proportion of volume of coarse aggregates
is increased by 0.01
Volume of coarse aggregates = 0.62 + 0.01
Therefore,
Volume of Coarse Aggregates = 0.63
Volume of Fine Aggregates = 1 – 0.63 = 0.37

B6. Estimation of FA Proportion
i) Volume of Concrete = 1m³
ii) Volume of Entrapped Air in Wet Concrete = 0.01 m3
iii) Volume of Cement = (261/3.15) x (1/1000) = 0.082m³
iv) Volume of Fly ash = (112/2.2) x (1/1000) = 0.0509 m3
v) Volume of water = (167.6/1) X (1/1000) = 0.168m³
vi) Volume of Chemical admixture = (3.72/1.1) X (1/1000) = 0.0033m3
Volume of all in aggregates = [1 – 0.01 - (0.082 +0.0509 + 0.168 + 0.0032)] = 0.686 m³
Vol. of the Cementitious material and water are obtained by
Mass of resp. materials X 1
Specific gravity of resp. materials 1000

B6. Estimation of FA Proportion contd….
v) Mass of Coarse aggregates = 0.686 X 0.63 X 2.68 X 1000
= 1158.0 kg.
vi) Mass of Fine aggregates = 0.686 X 0.37 X 2.66 X 1000
= 675.0 kg.
B7. Mix Proportion (for 1m³)
Cement = 261.0kg
Fly ash = 112.0 kg
Water = 167.0kg
Fine aggregates = 675.0 kg
Coarse aggregates = 1158.0 kg
Chemical Admixture
( 1% of Total mass of cementations ) = 3.72kg
w/c = 0.45

B7. Mix Proportion (for 1m³) contd….
Corrections applied for water content and mass of aggregates considering the Water absorption & Free
moisture:
Water absorption of CA is 0.5%, Free Moisture in FA is 2%.
I) Extra Quantity of water to be added for absorption in case of CA at 0.5%
= (0.5/100) X 1158.0 = 5.8 kg.
II) Extra Quantity of water to be added for absorption in case of FA at 1.0%
= (1/100) X 675.0 = 6.75 kg
III) Quantity of water to be deducted for free moisture in FA at 2%
= (2/100) X 675.0 = 13.50 kg.
Actual water required = 167.0 + 5.8 + 6.75 – 13.50 = 166.0 kg
Actual sand required = 675 – 6.75+ 13.50 = 682 kg.
Actual CA required = 1158.0 – 5.8 = 1152.0kg.

B8. Actual Quantities for Trial No. 1
Cement 265 kg/m³
Fly ash 110 kg/m³
Sand 682 kg/m³
Coarse Aggregates 1152 kg/m³
Water 166 kg/m³
Chemical Admixture 3.72 Kg/m³

Trial Mix & Measure A Slump Workability

Good Construction Practices :-
;:
;-

• Homogeneity and cohesiveness of concrete
•Compaction of Concrete
•Control W/C Raito
•Superior finishing of slabs/wall etc.
•No honeycombing
• Reduce cracks
•Durability of Structure
Benefits of Good Construction Practices :-

Concrete Mix Design - IS 10262-2019 - .pptx

Concrete Mix Design - IS 10262-2019 - .pptx

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