A slab is a smooth stone , of small thickness, which is used in the field of building . With the slabs the I usually , they develop rooftops and get dressed walls , for example.
The slabs, therefore, are building materials . Beyond its use in buildings, since ancient times they are used to develop different kinds of structures .
With small slabs, they used to be built cheating to hunt rodents or birds. In this case, the stone was placed in an almost vertical position, forming an angle with the ground. To hold it, a branch or stick was used. Under the slab was a bait to attract the animal that, when touching the branch, caused the stone to fall, being crushed or, at least, trapped.
Slabs were also used for wash the clothing . Garments were scrubbed with soap and water against the surface to remove dirt.
Long ago they used to cover graves with heavyweight slabs, as a cover of the tomb . On the stone it was common for the name of the dead to be engraved along with their dates of birth and death.
A hot slab Meanwhile, it serves to cook. There is a cooking method that consists of placing the slab on the fire and then arrange food on it, which is sometimes smeared with oil or butter (butter). Even the slab can be used later as a dish.
The Foundation slab Finally, it is a plate of concrete (concrete ) that rests on a ground to distribute the loads and the weight of a construction along the width of the total support surface.
In this context, it is called license plate to a structural element that, from a geometric point of view, can be approximated to another and work mainly to bending. Unlike the sheet , the plate has a flat half surface, while the first is curved (something that can be seen, for example, in a dome).
He concrete On the other hand, it is a composite material, since it is achieved by joining more than one to combine its properties and obtain impossible results by using only one. In this case, it is mainly a binder combined with additives, Water and aggregates. It is used in the field of construction.
The slab is a kind of surface foundation that offers a very satisfactory result in low-lying terrain. homogeneity , since engineers try to avoid differential settlements , the displacements or movements of the parts of a building that occur when the surface is irregular.
Another area in which the foundation slab is very successful is the land whose bearing capacity It is very scarce. The bearing capacity is that which the land has to withstand the loads that are applied to it.
There are slabs whose thickness it is invariable, the simplest, while others have different thicknesses according to the arrangement of the columns and walls, the ribbed slabs .
The calculation of the foundation slab is similar to that of a flat roof, although it is necessary to reverse the direction of each effort and apply the charges axial and the uniforms that come from each part of the building. The beams (large beams) of the slabs should be inverted so that they are buried in the surface, so that there are no obstacles in their use but that the result is a smooth space.
A foundation slab acts as a plate that receives the influence of forces verticals on its underside that are proportional to the settlement and the ballast module (a magnitude that is associated with surface stiffness).