Concrete is:

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Concrete is:

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Concrete is porous, allowing water and air to pass through it, which is why it can suffer from freeze-thaw cycles and needs sealing for certain applications. It is considered an artificial stone because it is manufactured through a controlled process of mixing cement (itself a manufactured product), aggregates like sand and gravel, and water. The process of concrete setting and hardening is a chemical reaction known as hydration, where the concrete cures and gains strength over time, rather than merely drying out by evaporation of water content.

Concrete Is