In this booster, you will learn - 1. How to find characteristics strength of concrete? 2. What are the grades of concrete described in IS 456?

1. MachenLink
RCC Grades
of
Concrete
Booster

2. MachenLink
What are the grades of concrete according to “IS 456: 2000” ?
Grade of Concrete is measured by standard compression test on concrete cube of 150 𝑚𝑚.
150 𝑚𝑚
M 20
M refers to mix Characteristics compressive strength (𝑓𝑐𝑘)
expressed in MPa (N/mm2 )
Its is defined as the strength of
material below which not more
than 5% result are expected to
fall.
20 samples
During compression test on cube in laboratory.
Not more than 1 in 20 tests result fall below the
characteristic value
Test results
23.8, 25.4, 26.9, 27.6……… 20 results25.1, 27.3,
Increasing order
Grade of concrete – M 25
fck = 25 N/mm2
Types of concrete Grade
High Strength concrete Above M 60
Standard Strength concrete M25 to M 55
Normal Strength concrete M 10 to M20