Concrete


 * 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.

__**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.

__**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.
 * __ 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.

Reinforced concrete



Prestressed concrete

Precast Concrete

Concrete-shell

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

===Tiltwall construction is the creation of walls by assembling forms and pouring large slabs of concrete called panels directly at the job site. One of its major benefits is that the size of the panel is only limited by the need of the building because it is work at the job site. But for the same reason one of the major problems is the weather conditions that limits the work. === ===Tilt-up construction (also called tiltwall or tilt wall construction) has a long history, but its widespread use is a relatively new phenomenon. In spite of this, tiltwall construction is fast becoming the method of choice for constructing modern warehouses, call centers, distribution centers, retail stores, office and storage buildings and other types of industrial and commercial facilities. On the other hand there are precast concrete constructions which are based on the creation of panels where concrete forms are poured indoors so this process addresses the challenges presented by the weather. But this has disadvantages too, for its condition it can’t be produce in a large scale such as the tilt-up constructions because of the transportation factor. ===