40 20 concrete design mix is the water to cementitious materials ratio. This is what determines the class of the design mix.
The mix proportion for M40 concrete is 1:1.65:2.92W/C ratio = 0.4The design calculation is as per IS mix design
Its 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.
a concrete mix of suitable slump as per mix design should be selected
it has more cement than the normal mix
1:1.5:0.4
weight of 1 cubic mitre of concrete
1:1.5:0.4
M30 mix should be a mix design in laboratory with the available raw materials that is used in the preparation of concrete. The aggregates, sand have different compressive strength, water absorption and these values are used in mix design.
mix ratio is 1 : 2 : 4 cement : fine aggregate : course aggregate
deign as per the codes or the design methods and go for the trail mixes.////
concrete is heterogeneous mixture. Ingredients in concrete are cement, sand, aggregates,and water. These are mixed based on mix design.