What materials are used in a standard concrete mix?

A standard concrete mix is composed of several key materials that work together to create a strong and durable finished product. The correct formulation includes coarse aggregate, cement, water, and fine aggregate.

Coarse aggregate typically consists of gravel or crushed stone, which provides strength and bulk to the concrete mix. Fine aggregate, usually sand, helps to fill the spaces between the coarse aggregates and contributes to the overall workability of the mixture. Cement acts as a binding agent that holds all the materials together once it reacts with water through the process of hydration. Water is also essential as it activates the cement and allows the mixture to achieve its hardness and strength as it cures.

This combination of materials ensures that the concrete has the right properties, including adequate strength, workability, and durability for various construction applications. Each component serves a specific purpose in the mix, making option A the comprehensive answer that encapsulates the full spectrum of materials typically used in a standard concrete mix.