What is cement content of p280 concrete (kg/m3)

The proportions of aggregates and cement are important as they are used to obtain optimized, workable and cohesive concrete for a set of locally available concrete ingredients.
When analyzing / designing a concrete mix, the proportion of aggregate cement plays following important roles.
1. The ratio of total aggregate per cement (A / C) decreases with increasing degree of concrete. For example, the degree of aggregate M20 will have an A / C ratio higher than that of M30
The weaker the A / C ratio of the concrete mix, the lower the cement content.
2.A / C ratio can be fine tuned to obtain a more viable concrete mix. It is governed by the particle size and the shape of the aggregate used. An elongated, flaky aggregate will require higher cement content (since they have a larger area for the same volume occupied, which requires a higher cement paste). On the other hand, an angular aggregate will require lower cement to achieve the working capacity for
Note: Total aggregate includes sand (fine aggregate) and aggregate (generally called coarse aggregate)
In addition, while analyzing / designing a concrete mix, the sand to total aggregate ratio plays by following important roles
1. In the total aggregate the proportion of sand to coarse aggregate (C.A) is altered depending on the fineness of the sand
2. A fine sand reduces the requirement of sand% in the total proportion of the aggregate. On the other hand, a coarse sand will require a greater percentage of sand in the total proportion of aggregate to give a mixture of cohesive concrete