Concrete

CONCRETE AND HIS DERIVATIVES

Some concepts...
 * [[image:ConcreteRecycler3.jpg width="180" height="264" align="right"]]Concrete: ** is a manufactured mixture of cement and water, with aggregates of sand and stones, which hardens rapidly by chemical combination to a stonelike, water-and-fire-resisting solid of great compressive but low tensile strength
 * Volcanic-ash **** cement ** :(pozzolana) permitted a great expansion of architectural methods, particularly the development of domes and vaults (often reinforced by brick ribbing) to cover large areas, of foundations, and of structures such as bridges and sewerage systems where water-proofing was essential
 * Reinforced concrete ** : to add the tensile strength of steel to the compressive strength of mass concrete. Reinforced concrete for use in railway ties, pipes, floors, arches, and bridges
 * [[image:concrete-pod-3.jpg width="150" height="150" align="left"]]The steel reinforcement: ** is employed to take full advantage of the plastic, or sculptural, character of concrete.
 * Concrete-shell ** : construction 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.
 * Precast-concrete: ** construction employs bricks, slabs, and supports made under optimal [[image:precast_parking_lot_bumper.JPG width="203" height="103" align="right"]]factory conditions to increase waterproofing and solidity, to decrease time and cost in erection, and to reduce expansion and contractions.
 * Prestressed concrete ** : provides bearing members into which reinforcement is set under tension to produce a live force to resist a particular load.

Difference between tiltwall construction, tilt-up panel construction and pre-cast concrete construction

Both “tilt” are forms spilt outdoors by what they are subject to the climatic changes. In addition, they need major workforce that the precast makes concrete. The precast concrete are prefabricated forms of concrete and are spilt inside the place of work and it can be used in spite of climatic conditions. The tilt-up constructs the walls poured the big slabs of concrete. Basically the first differentiation that we find is among the methods "tilt" and the pre-cast concrete, the "tilt" are made and ensamblads in the place where it is constructed the build, precast is made of another place. The prefabricated panels must be small and manageable to be able to be transported, the tilt-up and tilt-wall can do panels of the long thing that they wish because they are not transported. The tiltwall can conceive very wide and / or high panels; precast concrete it is easier to install that the tilt-up and tiltwall but it restricts the design and limits the uses of the construction.

CONCLUSION The concrete is a material of construction that it has evolved in the time. His great qualities have allowed him to be molded to the needs of many generations. Is used in heavy and strong constructions is the diversity of his forms, the extensive covers and foundations that can be done because it passes from a liquid state to solidly. The concrete one is used from 3ooo a C for the Egyptians, then for the Romans they invented the volcanic-ash to spill the concrete; from this moment the architectural technologies were begun to extend. For the 20th century is created of concrete-shell (that is a thin cap and moldable),the pre-cast concrete are prefabricated panels and the prestressed makes concrete that they are reinforcements for elements under tension. Concrete has evolved with the evolution of the architecture and the technology, is a versatile and resistant material.