Concrete is made from a mixture of cement, water, and aggregate. The cement, typically made from limestone and clay, acts as the binding agent in the mixture. The water is used to activate the cement and provide workability to the mixture. Aggregate, which can be made from materials such as crushed stone, gravel, or sand, is added to the mixture to provide strength and bulk. Depending on the specific application, other materials such as fly ash, slag cement, or air-entraining agents can also be added to the mixture to improve its properties.
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