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M-25 CONCRETE MIX DESIGN
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As per IS 10262-2009 & MORT&H
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A-1
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Stipulations for Proportioning
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1
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Grade Designation
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M25
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2
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Type of Cement
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OPC 53 grade confirming to IS-12269-1987
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3
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Maximum Nominal Aggregate Size
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20 mm
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4
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Minimum Cement Content (MORT&H 1700-3 A)
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310 kg/m3
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5
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Maximum Water Cement Ratio (MORT&H 1700-3 A)
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0.45
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6
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Workability (MORT&H 1700-4)
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50-75 mm (Slump)
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7
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Exposure Condition
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Normal
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8
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Degree of Supervision
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Good
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9
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Type of Aggregate
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Crushed Angular Aggregate
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10
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Maximum Cement Content (MORT&H Cl. 1703.2)
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540 kg/m3
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11
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Chemical Admixture Type
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Superplasticiser Confirming to IS-9103
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A-2
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Test Data for Materials
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1
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Cement Used
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Coromandal King OPC 53 grade
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2
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Sp. Gravity of Cement
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3.15
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3
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Sp. Gravity of Water
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1.00
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4
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Chemical Admixture
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BASF Chemicals Company
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5
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Sp. Gravity of 20 mm Aggregate
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2.884
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6
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Sp. Gravity of 10 mm Aggregate
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2.878
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7
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Sp. Gravity of Sand
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2.605
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8
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Water Absorption of 20 mm Aggregate
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0.97%
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9
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Water Absorption of 10 mm Aggregate
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0.83%
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10
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Water Absorption of Sand
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1.23%
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11
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Free (Surface) Moisture of 20 mm Aggregate
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nil
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12
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Free (Surface) Moisture of 10 mm Aggregate
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nil
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13
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Free (Surface) Moisture of Sand
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nil
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14
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Sieve Analysis of Individual Coarse Aggregates
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Separate Analysis Done
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15
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Sieve Analysis of Combined Coarse Aggregates
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Separate Analysis Done
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15
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Sp. Gravity of Combined Coarse Aggregates
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2.882
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16
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Sieve Analysis of Fine Aggregates
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Separate Analysis Done
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A-3
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Target Strength for Mix Proportioning
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1
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Target Mean Strength (MORT&H 1700-5)
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36N/mm2
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2
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Characteristic Strength @ 28 days
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25N/mm2
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A-4
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Selection of Water Cement Ratio
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1
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Maximum Water Cement Ratio (MORT&H 1700-3 A)
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0.45
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2
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Adopted Water Cement Ratio
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0.43
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A-5
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Selection of Water Content
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1
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Maximum Water content (10262-table-2)
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186 Lit.
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2
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Estimated Water content for 50-75 mm Slump
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138 Lit.
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3
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Superplasticiser used
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0.5 % by wt. of cement
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A-6
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Calculation of Cement Content
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1
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Water Cement Ratio
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0.43
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2
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Cement Content (138/0.43)
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320 kg/m3
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Which is greater then 310 kg/m3
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A-7
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Proportion of Volume of Coarse Aggregate & Fine Aggregate
Content
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1
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Vol. of C.A. as per table 3 of IS 10262
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62.00%
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2
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Adopted Vol. of Coarse Aggregate
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62.00%
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Adopted Vol. of Fine Aggregate ( 1-0.62)
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38.00%
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A-8
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Mix Calculations
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1
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Volume of Concrete in m3
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1.00
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2
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Volume of Cement in m3
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0.10
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(Mass of Cement) / (Sp. Gravity of Cement)x1000
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3
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Volume of Water in m3
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0.138
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(Mass of Water) / (Sp. Gravity of Water)x1000
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4
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Volume of Admixture @ 0.5% in m3
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0.00134
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(Mass of Admixture)/(Sp. Gravity of Admixture)x1000
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5
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Volume of All in Aggregate in m3
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0.759
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Sr. no. 1 – (Sr. no. 2+3+4)
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6
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Volume of Coarse Aggregate in m3
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0.471
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Sr. no. 5 x 0.62
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7
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Volume of Fine Aggregate in m3
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0.288
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Sr. no. 5 x 0.38
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A-9
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Mix Proportions for One Cum of Concrete (SSD Condition)
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1
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Mass of Cement in kg/m3
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320
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2
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Mass of Water in kg/m3
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138
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3
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Mass of Fine Aggregate in kg/m3
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751
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4
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Mass of Coarse Aggregate in kg/m3
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1356
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Mass of 20 mm in kg/m3
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977
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Mass of 10 mm in kg/m3
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380
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5
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Mass of Admixture in kg/m3
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1.60
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6
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Water Cement Ratio
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0.43
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