Ordinary concrete- M10,M15,M20
Standard Concrete-M25,M30,M35,M40,M45,M50,M55
High Strength concrete-M60,M65,M70,M75,M80
Here are two grades also specified in BIS for lean concrete
M5 and M7.5
Where M refers to Mix and the given no. specified the
characteristics compressive strength of 150 mm cube after 28
days curing on normal temperature..

In the designation of a concrete mix,letter M refers to the mix and the number to the specified characteristic compressive strength of 15 cm. cube at 28 days,express in N/mm2.As a example M25 = 25 N /mm2 or 250 Kg./cm2 (app).

Ordinary concrete- M10,M15,M20
Standard Concrete-M25,M30,M35,M40,M45,M50,M55
High Strength concrete-M60,M65,M70,M75,M80
Here are two grades also specified in BIS for lean concrete
M5 and M7.5
Where M refers to Mix and the given no. specified the
characteristics compressive strength of 150 mm cube after 28
days curing on normal temperature..

Ordinary concrete- M10,M15,M20
Standard Concrete-M25,M30,M35,M40,M45,M50,M55
High Strength concrete-M60,M65,M70,M75,M80
Here are two grades also specified in BIS for lean concrete
M5 and M7.5
Where M refers to Mix and the given no. specified the
characteristics compressive strength of 150 mm cube after 28
days curing on normal temperature

How to calculate the quantity of cement,sand,aggregate for the area L*B*T
are 15.24 m*21.36m*0.12m in the ratio 1:2:4
can any ine explain in detail by using formulas.
Thanks in advance

When you received a RA Bill of contractor at HO duly checked
and certified by Site In-charge, How to know at a glance it is
complete in order, do have any one checklist format in this
regard.