The key differences and usage of concrete and cement:

Concrete is a construction material made from a mixture of cement, aggregate (usually sand and gravel), water, and admixtures. Cement is a binder, a substance that sets and hardens independently, and can bind other materials together. The most common form of cement is Portland cement.

Concrete is used in many different ways, including paving roads, making buildings, bridges, dams, and more. It is the most widely used man-made material in the world.

Cement is an ingredient in concrete, but it is also often used on its own. When used on its own, cement can be mixed with water to create mortar or with aggregates to create concrete. Mortar is used for things like bricklaying and stonework, while concrete is used for paving, foundations, and more.

Cement is made from limestone that has been heated in a kiln. The resulting substance is a dry powder that can be mixed with water to create a paste. This paste is then used as the binder in concrete or mortar.

Concrete is stronger and more durable than cement on its own. It is also less likely to crack and crumble over time. However, concrete takes longer to cure than cement, so it must be allowed to set for several days before it can be used.

Cement is cheaper than concrete, so it is often used when budget is a concern. It is also faster to set and cure than concrete, so it can be used for projects that need to be completed quickly.

There are many different types of concrete, each with their own benefits and drawbacks. There are also many different types of cement, which can be mixed with different aggregates to create concrete with different properties.

Concrete is a versatile material that can be used in a variety of applications. It is strong, durable, and easy to work with. Cement is an important ingredient in concrete, but it can also be used on its own for projects such as mortar and concrete paving.