Concrete


 * Definitions: **

**-Concrete: ** is a material of construction, that consist in a manufactured mixture of cement and water, with aggregates of sand and stones.



**-Reinforced concrete: ** It was developed to add the tensile strength of steel to the compressive strength of mass concrete.



**-Precast-concrete: ** It employs bricks, slabs, and supports made under optimal factory conditions to increase waterproofing and solidity, to decrease time and cost in erection, and to reduce expansion and contractions.

**-Prestressed concrete **: It provides bearing members into which reinforcement is set under tension to produce a live force to resist a particular load.



**-Concrete-shell **: It permits the erection of vast vaults and domes with a concrete and steel content so reduced that the thickness is comparatively less than that of an eggshell.