Concrete

Definitions:

Concrete: manufactured mixure 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 grad compressive but low tensile strength.

Pozzolana:concrete made with volcanic-ash cement

Reinforced concrete: concrete which is reinforced by setting a mesh of bendable steel before being poured into the usual molds

Prestressed concrete: concrete with reinforcement set under tension to produce a live force to resist a particular load.

Images: Reinforced Concrete



Pre-cast Concrete:



Prestressed Concrete:



Concrete-shell:



In construction there are manifold techniques, pre-cast concrete, tiltwall construction and tilt-up construction are some of them. The first one consists on the creation of panels in a fabric because the parts are made before being put in the construction. The other processes mean the same thing; both are based on the creation of walls by assembling forms and pouring large slabs of concrete called panels directly at the job site. These construction techniques have advantages and disadvantages. In Tillwall construction the major benefit is that size of the panels are only limited by the need of the building, but because the fact this process consists in creation of panels in job site, the weather limits the construction. On the other hand precast construction doesn’t have problems with weather but have limit with size of panels and also in transporting that make this an expensive process.
 * What is the difference between tiltwall construction, tilt-up panel construction and pre-cast concrete construction? **

Conclusions:

I think concrete is an excellent material in construction, this have a large history and with pass of time the man have been participant in the development of this. Actually exist different techniques of make concrete; tilt-up panel construction, tiltwall construction and pre-cast concrete construction are some of theme. These processes give us so many advantages like possibilities of choose the place where panels will be make or different range in size of panels, but also disadvantages like weather limitations and transporting problems. In any case concrete is an extremely strong (in compression) material that can be poured into a form on-site, or pre-fabricated. Also it can be poured and cured under water, if necessary. On other hand this material is very weak under tension, though this can be moderated with steel reinforcement.