Concrete


 * - Definitions (concepts found in the text) ||


 * **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**. ||


 * **Reinforced concrete** was developed to add the tensile strength of steel to the compressive strength of mass concrete. It was invented (1849) by Joseph Monier, who received a patent in 1867. He exhibited his invention at the Paris Exposition of 1867. ||


 *  P **__recast-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. ||


 * Images of spaces created usi ng ||

- Reinforced Concrete

- Pre-Castt Concrete



- Prestressed Concrete



-Concrete- shell




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

For a tilt-up concrete building, the walls are created by assembling forms and pouring large slabs of concrete called panels directly at the job site. Because the concrete tiltwall forms are assembled and poured directly at the job site, no transportation of panels is required. One major benefit of this is that the size of the panels is limited only by the needs of the building and the strength of the concrete panels themselves.Tiltwall panels can sometimes be extremely wide and/or tall. Tilt-up panel have been measured at just over 69 feet across and almost 93 feet from top to bottom.

The precast concrete building process is similar to tilt-up construction, but it addresses the challenges presented by weather. For precast concrete buildings, work crews do not set up forms at the job site to create the panels. Instead, workers pre cast concrete panels at a large manufacturing facility. Because the precast concrete forms are poured indoors, this activity can take place regardless the weather conditions. After curing, the precast concrete panels are trucked to the job site. From this point, precast concrete buildings are assembled in much the same manner as tiltwall buildings. The fact that precast concrete walls are formed at a manufacturing facility resolves the weather issue, but presents a different limitation not found in tilt-up construction. Because the panels must be transported - sometimes over long distances - places a substantial limitation on how wide or tall each panel can be. It would be impossible to load precast panels that were 60 feet wide or 90 feet long onto trucks and transport them any distance.