Concrete

=Concrete =

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 * === ·  Fine-grained material ===


 * === · It composed of cement, water, small stones ===


 * === · Concrete is a cheap material  ===


 * === · It is fireproof and weatherproof, and strong in compression ===


 * === · This material molds to any shape ===


 * === · Its disadvantages: cracks with temperature changes, weak in tension ===


 * === · Used in early arch bridges and domes ===

= = =Post-reading =

 //__**Definitions**__//
===  __Reinforced concrete:__ was developed to add the tensile strength of steel to the compressive strength of mass 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 factory conditions to increase waterproofing and solidity, to decrease time and cost in erection, and to reduce expansion and contractions. ===

=== <span style="font-family: 'Comic Sans MS',cursive;">__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. ===

<span style="background: white; font-family: 'Comic Sans MS',cursive;">Reply to the podcast
===<span style="background: white; font-family: 'Comic Sans MS',cursive;">Concrete is the material most used in the construction; An example they are the temples of the ancient Greece that were done of this material. But in this epoch the concrete was used of the simplest form, called pozzolana. Today, thanks to the technology, the concrete is possible to work of different forms, obtaining reinforced concrete, pre-cast, prestressed. This material is preferred for being strong and resistant to the compression, which is very important in the construction. ===