Concrete

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** Concrete is the most used construction material in the world. It is made of a mixture of cement and water, with aggregates of sand and stones. The word concrete comes from the Latin word "concretus" (meaning compact or condensed).

Concrete is strong in compression, fireproof and weatherproof. It can be mold to any shape. Also it is weak in tension and it can have cracks with temperature changes. **

Types of concrete Sainte Jeanne d'Arc Church (France) Pantheon, Rome
 * Reinforced concrete : It was developed to add the tensile strength of steel to the compressive strength of concrete.
 * Concrete-shell: It is a development in construction that permit the erection of vast vaults and domes with concrete and steel.


 * Precast-concrete: It is a development in construction, that employs bricks, slabs, and supports made to increase waterproofing and solidity, to decrease time and cost, and to reduce expansion and contractions.

Walnut Lane Memorial Bridge, Philadelphia
 * Prestressed concrete: It provides bearing members into which reinforcement is set under tension to produce a live force to resist a particular load.