GRADE OF CONCRETE AND CONCRETE MIX DESIGN PROPORTION AS PER IS CODE

The proportions of concrete components such as cement , sand, aggregates , and water are the concrete mix ratios. These mixing ratios are decided on the basis of construction type and mixing designs.

This is required for concrete mix design and to know about strength of concrete as per its design ratio.

As a civil engineers its very important to know about concrete mix design. here we have discuss about concrete mix design as per is code. All grade of concrete, characteristic strength of concrete at 28 days and also concrete mix design proportion are give in the following table.

The following table are representing the grade of concrete with their compressive strength of concrete.

TABLE-1: GRADE OF CONCRETE

 

Grade Designation	Characteristic strength of Concrete at 28 days
	N/mm^2	PSI
M 5	5	725
M 7.5	7.5	1088
M 10	10	1450
M 15	15	2176
M 20	20	2901
M 25	25	3626
M 30	30	4351
M 35	35	5076
M 40	40	5802
M 45	45	6527
M 50	50	7252
M 55	55	7977
M 60	60	8702
M 65	65	9427
M 70	70	10153
M 75	75	10878
M 80	80	11603

Designed Concrete Mix Ratio

For such mixes, the manufacturer determines the output of the concrete but the proportions of the mix are determined by the concrete supplier, so that the minimum cement content can be set. This is the most logical approach to choosing proportions of blends of different products having more or less special characteristics in mind.

Of concrete with undesirable output nominal or normal mixture should only be used when the cement strength does not exceed 30 N / mm2 (prescribed in the codes by amounts of dry ingredients per cubic meter and slump). No control tests are required to depend on ingredients’ masses.

The following table are representing the design mix proportion of concrete.

TABLE-2: Concrete mix Design proportion

 

Grade Designation	Concrete mix Design proportion
	Cement	Sand	Coarse Aggr.
M 5	1	5	10
M 7.5	1	4	8
M 10	1	3	6
M 15	1	2	4
M 20	1	1.5	3
M 25	1	1	2
M 30	1	0.75	1.5
M 35	1	0.5	1
M 40	1	0.25	0.5
M 45	Design Mix
M 50
M 55
M 60
M 65
M 70
M 75
M 80

The following table are representing the design mix proportion of concrete with their  concrete grade and compressive strength of concrete.

TABLE-3: FULL CONCRETE MIX DESIGN PROPERTIES

Grade Designation	Characteristic strength of Concrete at 28 days		Concrete mix Design proportion			Group
	N/mm^2	PSI	Cement	Sand	Coarse Aggr.
M 5	5	725	1	5	10	Lean concrete
M 7.5	7.5	1088	1	4	8
M 10	10	1450	1	3	6	Ordinary Concrete
M 15	15	2176	1	2	4
M 20	20	2901	1	1.5	3
M 25	25	3626	1	1	2	Standard Concrete
M 30	30	4351	1	0.75	1.5
M 35	35	5076	1	0.5	1
M 40	40	5802	1	0.25	0.5
M 45	45	6527	Design Mix
M 50	50	7252
M 55	55	7977
M 60	60	8702				High Strength Concrete
M 65	65	9427
M 70	70	10153
M 75	75	10878
M 80	80	11603

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