prestressed concrete


Also found in: Dictionary, Acronyms, Wikipedia.

prestressed concrete

[¦prē′strest ′kän‚krēt]
(materials)
Concrete compressed with heavily loaded wires or bars to reduce or eliminate cracking and tensile forces.

prestressed concrete

A process of anchoring steel rods into the ends of forms, then stretching them before the concrete is poured, putting them under tension. When the concrete hardens, they spring back to their original shape, providing additional strength. See also: Concrete

Prestressed concrete

Concrete with stresses induced in it before use so as to counteract stresses that will be produced by loads. Prestress is most effective with concrete, which is weak in tension, when the stresses induced are compressive. One way to produce compressive prestress is to place a concrete member between two abutments, with jacks between its ends and the abutments, and to apply pressure with the jacks. The most common way is to stretch steel bars or wires, called tendons, and to anchor them to the concrete; when they try to regain their initial length, the concrete resists and is prestressed. The tendons may be stretched with jacks or by electrical heating.

Prestressed concrete is particularly advantageous for beams. It permits steel to be used at stresses several times larger than those permitted for reinforcing bars. It permits high-strength concrete to be used economically, for in designing a member with reinforced concrete, all concrete below the neutral axis is considered to be in tension and cracked, and therefore ineffective, whereas the full cross section of a prestressed concrete beam is effective in bending. See Reinforced concrete, Stress and strain

prestressed concrete

Concrete in which internal stresses are introduced of such magnitude and distribution that the tensile stresses resulting from the service loads are counteracted to a desired degree; in reinforced concrete the prestress commonly is introduced by tensioning the tendons.
References in periodicals archive ?
The prestressed concrete strand market analysis is provided for both the international and Chinese domestic situations including development trends, competitive landscape analysis, key regions development status and a comparison analysis between the international and Chinese markets.
Precast Prestressed Concrete Selected as the Preferred Structure Type
Based on the initial statistical analysis, the relationship between the annual average rate of deflection (f) and the length of the main span (L) of long-span prestressed concrete beam bridges is as following (Xu 2008):
Finite element analysis of prestressed concrete box girder bridges.
Completed in 2002, the earliest project, near Georgetown, TX, demonstrated the viability of constructing a pavement using precast prestressed concrete.
For the three-bridge project, Morse Brothers will make enough prestressed concrete beams to lay end-to-end for 8.
The South Beloit facility employs 80 people and makes prestressed concrete cylinder pipe used in municipal and industrial pressure water and waste water systems.
Construction is reinforced concrete with prestressed concrete floors.
report details a study to evaluate the use of sacrificial cathodic protection for reinforced and prestressed concrete bridge members.
Besides concrete piles and concrete electricity poles, WIKA--a state enterprise based in Jakarta--also produces conncetors, railway concrete sleepers, railway concrete crossings, steel constructions, prestressed concrete pipe, mould & dies, hot dip galvanizing, and solar water heaters.
The Advantages of Prestressed Concrete There has been much bad press about the extent of corrosion problems in concrete parking structures.