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

4, meet the above conditions to save cement and reduce the cost of concrete. The strength of concrete is divided into twelve grades, such as C7.5, C10, C15, C20, C25, C30, C35, C40, C45, C50, C55, C60 and so on. The concrete mix ratio refers to the proportion of the components in concrete (cement, water, sand, and stone).What Is Grade Of Concrete | Concrete Grade Ratio | Grade ...2 · concrete grade c25/30 meaning. In C25/30 concrete grade, C refers to concrete strength, 25 number indicates its characteristics of compressive strength (fck) on cylinder test that is 25MPa and numerical figure 20 represent its characteristics of compressive strength (fck) on cube test that is 30MPa.