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
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 |
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 |