#### Conventional grade C20, C25 and C30 concrete mix ratio ...

The strength of concrete is divided into twelve grades such as C7.5 C10 C15 C20 C25 C30 C35 C40 C45 C50 C55 and C60. Concrete mix ratios are expressed in two ways: one is expressed in materials used per cubic meter of concrete (Water: Cement: Sand: Gravel) and the other is expressed as a ratio of various materials. for example C:S:G ...