Concrete


 * Characteristics:**
 * Weak in tension.
 * Quite strong in compression.
 * Made of cement, water and small stones.
 * It's cheap, resistant to weathe and fire and it molds into any form.
 * It cracks if it's submited to temperature changes.

Concrete is a mixture of sand, stones, cement and water, which harden very fast into a solid material.

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 * Concrete Shell** **Reinforced Concrete** **Prestresed Concrete** **Precast Concrete