M-35 Mix Designs as per IS-10262-2009

The mix design for M35 Grade Of Concrete for pile foundations provided here is for reference purpose only. Actual site conditions vary and thus this should be adjusted as per the location and other factors.

Grade of Concrete : M35
Characteristic Strength (Fck) : 35 Mpa
Standard Deviation : 1.91 Mpa*
Target Mean Strength : T.M.S.= Fck +1.65 x S.D.(from I.S 456-2000)

                                                 = 35+ 1.65×1.91
= 38.15 Mpa

Test Data For Material:
Aggregate Type : Crushed
Specific Gravity
Cement : 3.15
Coarse Aggregate : 2.67
Fine Aggregate : 2.62

Water Absorption:
Coarse Aggregate : 0.5%
Fine Aggregate : 1.0 %

MIX DESIGN:

Take Sand content as percentage of total aggregates = 36%
Select Water Cement Ratio = 0.43 for concrete grade M35
(From Fig 2. of I.S. 10262- 1982)

Select Water Content = 172 Kg
(From IS: 10262 for 20 mm nominal size of aggregates Maximum Water Content = 186 Kg/ M3 )

Hence, Cement Content= 172 / 0.43 = 400 Kg / M3

Formula for Mix Proportion of Fine and Coarse Aggregate:

1000(1-a0) = {(Cement Content / Sp. Gr. Of Cement) + Water Content +(Fa / Sp. Gr.* Pf )}

1000(1-a0) = {(Cement Content / Sp. Gr. Of Cement) + Water Content +Ca / Sp. Gr.* Pc )}

Where

Ca = Coarse Aggregate Content
Fa = Fine Aggregate Content
Pf = Sand Content as percentage of total Aggregates = 0.36
Pc = Coarse Aggregate Content as percentage of total Aggregates.= 0.64
a0 = Percentage air content in concrete (As per IS :10262 for 20 mm nominal size of aggregates air content is 2 %) = 0.02

Hence, 1000(1-0.02) = {(400 /3.15) + 172 +(Fa / 2.62 x 0.36)}

Fa = 642 Kg/ Cum

As the sand is of Zone II no adjustment is required for sand.

Sand Content = 642 Kg/ Cum

1000(1-0.02) = {(400 /3.15) + 172 +(Ca / 2.67 x 0.64)}

Hence, Ca = 1165 Kg/ Cum

From combined gradation of Coarse aggregates it has been found out that the proportion of 53:47 of 20 mm & 10 mm aggregates produces the best gradation as per IS: 383.

Hence, 20 mm Aggregates = 619 Kg
And 10 mm Aggregates = 546 Kg

To obtain slump in the range of 150-190 mm water reducing admixture brand SP430 from Fosroc with a dose of 0.3 % by weight of Cement shall be used.

Hence the Mix Proportion becomes:

Cement W/C Water Sand 20mm(agg.) 10mm(agg.) Admix
400 0.43 172 635 619 564 1.2
1 0.43 1.6 1.547 1.36 0.003

Units – Kg/ M3

Cement : Sand: Coarse Aggregates = 1 : 1.6 : 2.907

OR

CONCRETE MIX DESIGN

As per IS 10262-2009 & MORT&H

A-1

Stipulations for Proportioning

1

Grade Designation M35

2

Type of Cement OPC 53 grade confirming to IS-12269-1987

3

Maximum Nominal Aggregate Size 20 mm

4

Minimum Cement Content (MORT&H 1700-3 A) 310 kg/m3

5

Maximum Water Cement Ratio (MORT&H 1700-3 A) 0.45

6

Workability (MORT&H 1700-4) 50-75 mm (Slump)

7

Exposure Condition Normal

8

Degree of Supervision Good

9

Type of Aggregate Crushed Angular Aggregate

10

Maximum Cement Content (MORT&H Cl. 1703.2) 540 kg/m3

11

Chemical Admixture Type Superplasticiser Confirming to IS-9103

A-2

Test Data for Materials

1

Cement Used Coromandal King OPC 53 grade

2

Sp. Gravity of Cement 3.15

3

Sp. Gravity of Water 1.00

4

Chemical Admixture BASF Chemicals Company

5

Sp. Gravity of 20 mm Aggregate 2.884

6

Sp. Gravity of 10 mm Aggregate 2.878

7

Sp. Gravity of Sand 2.605

8

Water Absorption of 20 mm Aggregate 0.97%

9

Water Absorption of 10 mm Aggregate 0.83%

10

Water Absorption of Sand 1.23%

11

Free (Surface) Moisture of 20 mm Aggregate nil

12

Free (Surface) Moisture of 10 mm Aggregate nil

13

Free (Surface) Moisture of Sand nil

14

Sieve Analysis of Individual Coarse Aggregates Separate Analysis Done

15

Sieve Analysis of Combined Coarse Aggregates Separate Analysis Done

15

Sp.Gravity of Combined Coarse Aggregates 2.882

16

Sieve Analysis of Fine Aggregates Separate Analysis Done

A-3

Target Strength for Mix Proportioning

1

Target Mean Strength (MORT&H 1700-5) 47N/mm2

2

Characteristic Strength @ 28 days 35N/mm2

A-4

Selection of Water Cement Ratio

1

Maximum Water Cement Ratio (MORT&H 1700-3 A) 0.45

2

Adopted Water Cement Ratio 0.4

A-5

Selection of Water Content

1

Maximum Water content (10262-table-2) 186 Lit.

2

Estimated Water content for 50-75 mm Slump 160 Lit.

3

Superplasticiser used 0.5 % by wt. of cement

A-6

Calculation of Cement Content

1

Water Cement Ratio 0.4

2

Cement Content (160/0.42) 400 kg/m3
Which is greater then 310 kg/m3

A-7

Proportion of Volume of Coarse Aggregate & Fine Aggregate Content

1

Vol. of C.A. as per table 3 of IS 10262 62.00%

2

Adopted Vol. of Coarse Aggregate 62.00%
Adopted Vol. of Fine Aggregate ( 1-0.62) 38.00%

A-8

Mix Calculations

1

Volume of Concrete in m3 1.00

2

Volume of Cement in m3 0.13
(Mass of Cement) / (Sp. Gravity of Cement)x1000

3

Volume of Water in m3 0.160
(Mass of Water) / (Sp. Gravity of Water)x1000

4

Volume of Admixture @ 0.5% in m3 0.00168
(Mass of Admixture)/(Sp. Gravity of Admixture)x1000

5

Volume of All in Aggregate in m3 0.711
Sr. no. 1 – (Sr. no. 2+3+4)

6

Volume of Coarse Aggregate in m3 0.441
Sr. no. 5 x 0.62

7

Volume of Fine Aggregate in m3 0.270
Sr. no. 5 x 0.38

A-9

Mix Proportions for One Cum of Concrete (SSD Condition)

1

Mass of Cement in kg/m3 400

2

Mass of Water in kg/m3 160

3

Mass of Fine Aggregate in kg/m3 704

4

Mass of Coarse Aggregate in kg/m3 1271
Mass of 20 mm in kg/m3 915
Mass of 10 mm in kg/m3 356

5

Mass of Admixture in kg/m3 2.00

6

Water Cement Ratio 0.40

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