1:2:4
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M25 - 1:1:2
M20 - 1:1.5:3
M15 - 1:2:4
M10 - 1:3:6
[M20 - Characteristic compressive strength of concrete after 28 days of curing 15cm cube, 1:1.5:3 - cement : sand : aggregate.]
grade 30 concrete is 1:1:2
grade 25 concrete is 1:1.5:3
grade 20 concrete is 1:2:4
The ratio of cement, sand and crushed stone in M 25 grade concrete is 1:1:2.In this grade of concrete a compressive strength not less than 25 N/mm2 is achieved in 28 days.
A lean mix simply means that there is more liquid that concrete in the mix. The mix is thin and pours easier. It is sometimes used when you need to make a base on an uneven surface, like dirt. You would pour the lean mix, and then use it to put the more solid mix on top of.
How to mix 4500 psi cement?
To calculate the amount of sand and metal (aggregate) in M10 and M20 grades of concrete, you first need to determine the mix ratio. M10 is typically a 1:3:6 ratio (cement:sand:aggregate) and M20 is a 1:1.5:3 ratio. For a given volume of concrete, calculate the total parts in the mix, then divide the total volume by the sum of the parts to find the volume of each component. Finally, multiply the volume of sand and aggregate by their respective mix ratios to find the quantities needed.
The strength of concrete depends on the mix used to make it- ratio of cement, sand, gravel and water. If the mix does not produce a concrete that is strong enough, the concrete will break.