What is concrete and what are the basic ingredients?
Concrete is a mixture of portland cement, aggregate and water. The water and the cement combine to form a paste which binds the aggregates (gravel and sand) together to form a very hard, solid mass when set. Some concrete may also contain chemicals called admixtures. These admixtures are used to improve certain performance characteristics of the concrete. They may include bonding agents, water reducers, air entraining agents, accelerators or pigments.
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