Ordinary concrete is a common construction material made from a mixture of cement, water, sand, and gravel or crushed stone. It is known for its strength and durability, making it suitable for a wide range of applications, including buildings, roads, and bridges. The proportions of the ingredients can vary, but the typical mix is one part cement, two parts sand, and three parts gravel. Once mixed, ordinary concrete can be poured into molds to create various shapes and structures. It hardens over time through a chemical process called hydration, which allows it to gain strength. This versatility and reliability make ordinary concrete a fundamental material in the construction industry.