Concrete mix design & mix ratio of concrete

         Mix ratio of concrete 

Theory:-

 👉The process of selecting suitable ingredients of concrete and determining their relative amounts with the objective of producing a concrete of the required, strength, durability, and workability as economically as possible is termed the concrete mix design.

Mix Ratio = X:Y:Z 

X= cement 

Y= Sand 

Z = aggregate  

for example taking M15 

M = Mix 

15 = 15 N/mm2 or MPa  in 28 days curing 

( compressive strength of concrete in 28 curing days after casting ) 

There are two types of mix 

1.) Nominal Mix 

2.) Design mix 

1.)Nominal  Mix Proportions

In the past the specifications for concrete prescribed the proportions of cement, fine and coarse aggregates. 

These mixes of fixed cement-aggregate ratio which ensures adequate strength are termed nominal mixes.

M25   =1:1:2  

M20  = 1:1.5:3

M15  = 1:2:4

M10  = 1:3:6

M7.5 = 1:4:8

M5    = 1:5:10

Addition of water 💧in mix

It's varies from 45% to 60% of cement quantity mixing  with sand and aggregate for concrete 

Like this we can say 

M20     ------- 45% 

.

.

.

.M5     ---------- 60% 

      Video for above theory click on it 👈

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