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Concrete Mix Proportion following IS 10262

STEP 1: Stipulations for Proportioning 1. Grade Designation:
2. Type of cement: OPC 43 grade IS 8112
2'.
3.
4. Min. cement content (kg/cum): 300
5. Max. water/cement ratio: 0.55
6. Workability (mm):
7.
8. Method of concrete placing: Pumping
9. Degree of supervision: Good
10. Type of aggregate:
11. Maximum cement content (kg/cum): 450
Admixture is used:
STEP 2: Test Data of Materials 1. Cement used: OPC 43 grade IS 8112
2. Sp. Gravity of cement: *
3. Chemical admixture: As above
4. Specific Gravity of:   Coarse Aggregate: *           Fine Aggregate: *
5. Water absorption:  Coarse Aggregate: *           Fine Aggregate: *
6. Free (surface) moisture: C.A= NIL       F.A= NIL
7. Sieve analysis: CA See gradation table
                             FA confirming to grade of Table 4 of IS : 383
STEP 3: Target Strength for Mix Proportioning                f'ck = fck + 1.65s
where
f'ck = target average compressive strength at 28 days
fck = characteristic compressive strength at 28 days, and
s = standard deviation.

From Table 1 , with concrete strength of 10MPa, standard deviation s = 3 N/sqmm. Therefore, target strength = 10 + 1.65*3 = 15.8  
STEP 4: Selection of w/c ratio Max. w/c ratio = 0.55       From Table 5 of IS 456  
Adopting w/c ratio as
If value is not set, adopting value is assumed =
STEP 5: Selection of water content Maximum water content =
(for Aggregate: 20 mm and type of aggregate: Crushed Angular Aggregate)
Estimated water content for slump mm = (litres)
The arrived water content = (litres)
STEP 6: Calculation of Cement Content Water-Cement ratio =
Cement content =
STEP 7: Proportion of Volume of Coarse Aggregate And Fine Aggregate Content 1. From Table 3, Vol. of CA corresponding to coarse aggregate size mm and Fine Aggregate for water/cement ratio of 0.5:
2. In the present case, water/cement ratio =
Volume of Coarse Aggregate is required to be adjusted to change the Fine Aggregate content.
Therefore, the adjusted volume of Coarse Aggregate for the present WC =
3. For Pumpable concrete, these values should be reduced by 10% (as per cl.4.4.1 of 10262)
Therefore, volume of Coarse Aggregate =
volume of Fine Aggregate =
STEP 8: Mix Calculations The mix calculations per unit volume of concrete shall be as follows:
1. Vol. of Concrete (cum) = 1
2. Vol. of Cement (cum) (Mass of cement/ Spec.Gravity of Cement)x1/1000 =
3. Vol. of water (cum) =
4. Vol. of Chemical Admixture =
5. Vol. of All-in-aggregate = =
6. Mass of Coarse Aggregate = (5) x Vol. of CA x Sp.grav. of CA x 1000 =
7. Mass of Fine Aggregate = (5) x Vol. of FA x Sp.grav. of FA x 1000 =
STEP 9: MIX SUMMARY 1. Cement weight (kg) =
2. Water weight (kg) =
3. Chemical Admixture (litres) =
4. Mass of Coarse Aggregate (kg) =
5. Mass of Fine Aggregate (kg) =
STEP 1: Stipulations for Proportioning
1. Grade Designation:
2. Type of cement: OPC 43 grade IS 8112
2′. Type of mineral admixture (if any):
3. Max. Nom. Size of aggregate (mm):
4. Min. cement content (kg/cum): 300
5. Max. water/cement ratio: 0.55
6. Workability (mm):

7. Exposure condition:
8. Method of concrete placing: Pumping
9. Degree of supervision: Good
10. Type of aggregate:
11. Maximum cement content (kg/cum): 450
Admixture is used: Yes No
STEP 2: Test Data of Materials
1. Cement used: OPC 43 grade IS 8112
2. Sp. Gravity of cement:
3.15
*
3. Chemical admixture: As above
4. Specific Gravity of: Coarse Aggregate:
* Fine Aggregate:
*
5. Water absorption: Coarse Aggregate:
* Fine Aggregate:
*
6. Free (surface) moisture: C.A= NIL F.A= NIL
7. Sieve analysis: CA See gradation table
FA confirming to grade of Table 4 of IS : 383
STEP 3: Target Strength for Mix Proportioning
f’ck = fck + 1.65s
where
f’ck = target average compressive strength at 28 days
fck = characteristic compressive strength at 28 days, and
s = standard deviation.

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