Concrete

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This construction technique consists in the base mixture of water and cement, and stone and sand could be also added to the mix.
There are several methods of use of concrete, are presented below:



**__ Reinforced __ __ concrete __:**

__ Precast concrete __


====Consists in the elaboration of concrete pieces for building construction. These pieces are produced in a factory, where the is poured into a mold, it waits until it hardens to remove the piece from the mold, then transported to the job site.====

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** What is the difference between tiltwall construction, tilt-up panel construction and pre-cast concrete construction? **
==== "Tilt-up construction" and "precast concrete" are cement building processes, which differ in the location in which the prefabricated pieces are produced. In "Tilt-up construction" the pieces or panels are fabricated at the job site and therefore, the transportation of the pieces is not required; also the process of "Tilt-up construction" has the advantage of developing unlimited size pieces, these pieces are developed according to the size of the building. But this process has problems in cold weather sites, because low temperature does not allow the cement to harden, when this happens they have to apply the process of precast concrete. This process consists in producing the pieces in places where the climate is favorable and then transport them to the job site. Because the pieces have to be transported, the size of the pieces is limited. ====

Conclusion
==== Concrete is an efficient construction technique discovered by the Romans, this technique consists in the base mixture of water and cement, and stone and sand could be also added to the mix. When you make the mixture, you obtain a moldable mass, which then hardens. The concrete is characterized by its hardness, its resistance to water and fire. Its advantage over stone and brick is the continuity (absence of joints) and merge with other materials. ====

==== Without doubt, all the properties of concrete makes it a more efficient technique of construction and allowed the development of new methods of architecture, from the time of the Romans, with the development of the dome and the vaults until now, with new techniques like "Reinforced concrete", "Precast concrete", "Prestressed concrete" and "Concrete shell", allowing us to build modern structures. ====