Standard Concrete Mix Designs

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Standard Concrete Mix Designs

Requirement of cement, water , dry aggregate(both coarse and fine) for different grades of concrete (Nominal Mix) work are given as under:

Table 9 Proportions for Nominal Mix Concrete
(Clauses 9.3 and 9.3.1)
IS 456-2000

Grade Nominal mix usually adopted
 
Consumption of cement(bags) per cum of concrete
 
Quantity of water per 50kg.of cement mix(litres)
 
*Total Quantity of Dry aggregate by Mass per 50 kg of cement, kg (max)
 
M20 1:1.5:3 8.00 30 250
M15 1:2:4 6.40 32 330
M10 1:3:6 4.40 34 480
M7.5 1:4:8 3.40 45 625
M5 1:6:12

2.20

60 800

*Total quantity= Sum of the individual masses of fine and coarse aggregates, kg

Proportion of fine aggregate to coarse aggregate (by mass) : Generally 1:2 but subject to an upper limit of 1:1.5 and a lower limit of 1:2.5

Note:

The proportion of fine aggregate to coarse aggregate should be adjusted from upper limit to lower limit progressively as the grading of fine aggregate becomes finer and the maximum size of the coarse aggregate becomes larger. Graded coarse aggregate shall be used.

Example:

For an average grading of fine aggregate(That is Zone II of Table 4 of IS 383) the proportions shall be 1:1.5, 1:2, 1:2.5 for maximum size of aggregates 10mm, 20mm and 40mm respectively.