Strength of Concrete

In this construction video today I will explains the strength of concrete. The testing is generally done after 28 days for checking the strength of concrete like a concrete box cylinder strength.
First of all we will make a concrete box or cylinder which size should be 15 cm cube.
So we have different Grade of Concrete which are given:
Strength of the concrete is also affected by grade of concrete i.e. M10, M15, M20, M25 etc. Besides, other factors upon which the concrete strength is dependent range from quality of raw materials, proportion of water & cement, proportion of coarse & fine aggregate, proportion of aggregate & cement, age of concrete, compaction of concrete, temperature, relative humidity, curing etc.
Here M denotes general mix and 10 (Number ) denotes characteristic of compressive strength in N/mm2 after 28 day’s.
If the age is 1 day, the concrete box or concrete can gain strength of 16%
If the age is 3 days, the concrete box or concrete can gain strength of 40%
If the age is 7 days, the concrete box or concrete can gain strength of 65%
If the age is 14 days, the concrete box or concrete can gain strength of 90%
If the age is 28 days, the concrete box or concrete can gain strength of 99%
In Civil Engineering the concrete compressive strength requirement can be differ form 2500 psi for residential concrete to 4000 Psi (28Mpa) and also it can greater in commercial building structures. and Higher strength are equal to and surpassing to 10000 psi which is ( Mpa ).
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For more watch the given video of my channel:
By: Engr Sami Ullah Stanikzai
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