If a concrete mix is formulated as 1:2:4, how is it composed?

The composition of a concrete mix formulated as 1:2:4 indicates the ratio of the various components used in the mix. In this case, the correct interpretation of the ratio is that it consists of 1 part cement, 2 parts sand, and 4 parts coarse aggregate.

Cement acts as the binding agent in the mixture, while sand provides workability and contributes to the strength when it hardens. The coarse aggregate, often gravel or crushed stone, adds bulk and structural integrity to the concrete. The specific proportions are designed to achieve an optimal balance between strength and durability while also ensuring workability during the mixing and pouring process.

Understanding these ratios is crucial for achieving the desired properties in concrete—such as compressive strength, setting time, and resistance to weathering—making the knowledge of material composition essential for effective construction practices.