M-15 Concrete mix design

mix-concrete-by-hand

The concrete mix designs as per IS-10262-2009 which gives to change the procedure for calculating the concrete ingredients

M-15 CONCRETE MIX DESIGN

(As per IS 10262-2009 & MORT&H)

A-1

Stipulations for Proportioning

1

Grade Designation M15

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) 250 kg/m3

5

Maximum Water Cement Ratio (MORT&H 1700-3 A) 0.5

6

Workability (MORT&H 1700-4) 25 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 Not Used

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) 25N/mm2

2

Characteristic Strength @ 28 days 15N/mm2

A-4

Selection of Water Cement Ratio

1

Maximum Water Cement Ratio (MORT&H 1700-3 A) 0.5

2

Adopted Water Cement Ratio 0.5

A-5

Selection of Water Content

1

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

2

Estimated Water content for 25 mm Slump 135 Lit.

3

Superplasticiser used nil

A-6

Calculation of Cement Content

1

Water Cement Ratio 0.5

2

Cement Content (135/0.5) 270 kg/m3
Which is greater then 250 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 65.00%
Adopted Vol. of Fine Aggregate ( 1-0.65) 35.00%

A-8

Mix Calculations

1

Volume of Concrete in m3 1.00

2

Volume of Cement in m3 0.09
(Mass of Cement) / (Sp. Gravity of Cement)x1000

3

Volume of Water in m3 0.135
(Mass of Water) / (Sp. Gravity of Water)x1000

4

Volume of Admixture @ 0% in m3 nil
(Mass of Admixture)/(Sp. Gravity of Admixture)x1000

5

Volume of All in Aggregate in m3 0.779
Sr. no. 1 – (Sr. no. 2+3+4)

6

Volume of Coarse Aggregate in m3 0.507
Sr. no. 5 x 0.65

7

Volume of Fine Aggregate in m3 0.273
Sr. no. 5 x 0.35

A-9

Mix Proportions for One Cum of Concrete (SSD Condition)

1

Mass of Cement in kg/m3 270

2

Mass of Water in kg/m3 135

3

Mass of Fine Aggregate in kg/m3 711

4

Mass of Coarse Aggregate in kg/m3 1460
Mass of 20 mm in kg/m3 1051
Mass of 10 mm in kg/m3 409

5

Mass of Admixture in kg/m3 nil

6

Water Cement Ratio 0.5

We hope this would be of great significance to civil engineers.

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