Concrete

Pantheon, Rome. ** Notes Concrete!! **

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.

Concrete was employed and developed in ancient Rome.

__**Advantages:**__

-Concrete does not cost too much -It doesnt weight that much either -It is very cheap -Concrete is fireproof and waterproof -It molds to any shape -It is strong in compression


 * __Disadvantages:__**

-Concrete cracks with temperature changes -It is weak in tension


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


 * __1) Concrete-shell construction__**: permits the erection of vast vaults and domes with a concrete and steel content so reduced that the thickness is very low, similar to an egg shell.


 * __2)__ __Precast-concrete construction__**: employs bricks, slabs, and supports to increase waterproofing and solidity, to decrease time and cost in erection, and to reduce expansion and contractions.


 * __3) Prestressed concrete:__** provides bearing members into which reinforcement is set under tension to produce a live force to resist a particular load. Since the member acts like a spring, it can carry a greater load than an unstressed member of the same size.




 * __ Reinforced Concrete __**

__** Pre-cast Concrete **__




 * __ Prestressed Concrete __**




 * __

Concrete shell __**



What is the difference between tiltwall construction, tilt-up panel construction and pre-cast concrete construction? **

Tilt-up and tilt wall are two terms that actually describe the same process, in this process the walls are produced through forms (molds) where the concrete is poured directly into the workplace without having to transport panels and such. Because of this, the panels can be designed without any restriction on size and shape, also allowing to architect a more creative design because of the flexibility in the construction process. However, it also has its drawbacks, these worker processes are performed outdoors, and so the construction will be governed or exposed to the weather of the place.

On the other hand, the precast concrete building process is different because are made in factories, making it easier and faster construction, however, it creates another difficulty: transportation, which would increase costs and limit the size of the pieces. In conclusion, both methods are very efficient, it is only necessary to choose the best site according to the building, tilt-up method is perfect for places where the weather is not so unpredictable, however, precast panels are more independent climatic conditions.



Conclusions Concrete  In conclusion, concrete is a mixture consisting mainly of cement and water, in addition to other aggregates such as sand and gravel., Used in construction for centuries. Concrete makes its first appearance in ancient Egypt, followed by Greece and Rome. Concrete is a material with many advantages in construction, water and fire resistant, is easily moldable, and is very strong in compression but weak in tension, therefore, subsequently, we working with the reinforced concrete.  Over time, have been refined the techniques and handling of concrete, we now have precast concrete panels, which serve to speed it up in places of unpredictable weather, also prestressed concrete contruction for special structures such as bridges, and concrete shell construction to facilitate the process of building domes or shells.