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Topic: Prestressed concrete

	Prestressed concrete - Wikipedia, the free encyclopedia
		Prestressing requires the use of high strength tendon materials (like prestressing steel wires, strands or bars) because time-dependent concrete strains (due to concrete creep under compressive stresses and concrete shrinkage due to the drying and hardening process) tend to reduce the tension in the tendons over time.
		After the concrete has acquired adequate strength, the tendons are cut at the bulkheads; the tendon anchorage force is transferred from the bulkhead to the concrete by means of bond between the prestressing steel and the concrete.
		After the concrete has been placed and gained sufficient strength, the embedded tendons are stressed and the compressive reaction to the tensile forces in the tendons prestresses the concrete.
	en.wikipedia.org /wiki/Prestressed_concrete (891 words)

	Stand. Spcs -- English -- 430 ERECTING PRESTRESSED CONCRETE (Site not responding. Last check: 2007-11-03)
		Prestressed concrete members shall be erected by methods which satisfy the handling requirements specified in Article 4303.
		When concrete is to be cast in contact with prestressed members, the surface of the member which will be in contact with the fresh concrete shall be thoroughly cleaned and wetted for a minimum of 2 hours just prior to casting the fresh concrete.
		The quantity of prestressed concrete girders to be paid for will be the number of linear feet of prestressed concrete girders estimated on the plans as being necessary to complete the project.
	www.ncdot.org /doh/construction/ps/specifications/english/s430.htm (561 words)

	OTEP Precast concrete industry Prestressed concrete
		Prestressed concrete combines two high quality materials, concrete and steel, retaining the best of both.
		Prestressed concrete eliminates cracking, improves the yield of the material by using the entire section, makes lighter constructions and makes it possible to realize wide spans with limited heights.
		The prestressed components require no maintenance, insurance premiums are lower and fire resistance is generally sufficient to eliminate any additional and costly treatment.
	www.otep-sa.com /en (346 words)

	What is Prestressed Concrete
		The unique characteristics of prestressed concrete allow predetermined, engineering stresses to be placed in members to counteract stresses that occur when the unit is subjected to service loads.
		Concrete is then poured into the forms encasing the strands.
		Prestressed or pretensioned before it leaves the plant, a slight arch or camber is noticeable.
	www.ferrericon.com /Whatis.html (246 words)

	Post-Tensioning Institute
		Prestressed concrete or masonry has internal stresses (forces) induced into it during the construction phase for the purpose of counteracting the anticipated external loads that it will encounter during its lifecycle.
		Concrete, masonry, and most cement based products are very strong in compression, or, in other words, they have a high capacity to resist compressive forces.
		The prestressing steel is housed in a sheathing or duct to allow it move as the tensioning force is applied after the concrete cures.
	www.post-tensioning.org /info_whatispt.asp (750 words)

	PB Network \| Issue 57 \| PB's Role in Prestressed Concrete Transportation Structures in the U.S. (Site not responding. Last check: 2007-11-03)
		The principles of prestressed concrete were understood by about 1910, and practical designs using this material were introduced in France in the early 1930s by Eugene Freyssinet.
		PB was one of the first firms to use prestressed concrete in U.S. transportation structures and has been responsible for the innovative design of many types of prestressed concrete structures.
		One notable item was believed to be the first use of spliced prestressed concrete girder bridges in the U. This was accomplished by using cast-in-place concrete box girder caps with 31-m (104 foot) -long precast girders, the longest available at that time, providing spans of 40 m (132 feet).
	www.pbworld.com /news_events/publications/network/issue_57/57_24_abrahamsm_pbsrolepreconcrete.asp (1837 words)

	Morse Bros. Prestressed Concrete Group
		Morse Bros. Prestressed Concrete Group is a national and regional award-winning leader in the precast/prestressed concrete industry.
		The precast and prestressed industry throughout the United States organized and began developing design, manufacturing and quality standards that are still today the foundation of all precast/prestressed concrete.
		As with the structural precast and prestressed concrete members, Morse Bros.' mission is to provide not only the best quality architectural precast concrete products and support services, but to offer reliable assistance for the structural design and suitable application of our regular precast products.
	www.morsebrosprestress.com /company.html (487 words)

	ICC Online \| Certification & Testing \| Prestressed Concrete Special Inspector (Site not responding. Last check: 2007-11-03)
		Stranded prestress cable shall be composed of _____ strands of wire.
		The vertical spacing of lateral ties in a prestressed concrete column shall not exceed _____ tie diameters, or the least dimension of the column.
		Primary reinforcement in prestressed concrete beams shall be covered by a minimum of _____ inches of concrete.
	www.iccsafe.org /certification/pcsi.html (785 words)

	Concrete Industries Products - Precast/Prestressed Concrete - Concrete, The Superior Material
		This is one of the reasons why precast/prestressed concrete is used in everything from food processing and industrial facilities to parking garages and office buildings to churches, stadiums and other projects.
		Concrete can be as utilitarian or as exciting as you like.
		A total precast/prestressed concrete building system from Concrete Industries is the perfect choice to satisfy your long-term goals.
	www.concreteindustries.com /products/concrete_superior.html (301 words)

	National Concrete Tanks - Prestressed Concrete Tanks
		National Concrete Tanks is a manufacturer of precast, prestressed concrete storage tanks built in accordance with American Water Works Association Standard D110 for wire-wound circular prestressed concrete tanks.
		National Concrete Tanks has the capacity to construct tanks from 100,000 to 20,000,000 gallons or larger.
		Are you concerned about the lack of competition in the precast, prestressed concrete tank market and the effect it will have on your upcoming project?
	www.concretetank.com (141 words)

	Prestressed Concrete Association of Pennsylvania (Site not responding. Last check: 2007-11-03)
		The Prestressed Concrete Association of Pennsylvania is a non-profit industry organization of prestressed concrete bridge beam manufacturers approved by the Department of Transportation of the Commonwealth of Pennsylvania as a material source and located in the Commonwealth of Pennsylvania.
		To advance and stimulate the prestressed concrete industry and to promote the use of prestressed concrete.
		To promote and educate on behalf of the prestressed concrete industry as a whole.
	www.pcap.org (99 words)

	Hazards Associated with Strand Restraint Devices in Manufacturing Prestressed Concrete Beams
		The Bismarck, North Dakota Area Office investigated a fatal accident that involved the failure of a drape strand restraint device during the manufacture of prestressed concrete bridge beams.
		To obtain the proper tension and arch, the wire ropes were strung through steel strand restraint devices near the base of the concrete beam.
		Redesign the prestressed concrete pouring process so there is no need to install a wood shim under the restraint devices holding the drape strands.
	www.osha.gov /dts/shib/shib060204.html (992 words)

	Amazon.com: Construction of Prestressed Concrete Structures (Wiley Series of Practical Construction Guides): Books: Ben ... (Site not responding. Last check: 2007-11-03)
		The first of the book's two sections deals with materials and techniques for prestressed concrete, including the latest recipes for high-strength and durable concrete mixes, new reinforcing materials and their placement patterns, modern prestressing systems, and special techniques such as lightweight concrete and composite construction.
		For engineers and construction contractors involved in any type of prestressed concrete construction, this book enables the effective implementation of advanced structural concepts and their economical and reliable translation into practice.
		Concrete is a heterogeneous material composed of aggregates embedded in a cementitious matrix which bonds them together.
	www.amazon.com /exec/obidos/tg/detail/-/0471181137?v=glance (838 words)

	CE 456 Prestressed Concrete Design
		Design Activities: The main emphasis in this course is on the design of prestressed concrete members of various cross-sectional shapes.
		Computer Activities: The students are assigned a term project wherein they are required to develop a computer program that can be used as an aid in design and/or analysis of a prestressed concrete member.
		A field trip is planned where the students observe the production and design of prestresses concrete components.
	www.eng.uab.edu /cee/coursehtml/ce456.htm (484 words)

	GCP - manufacturer of precast prestressed concrete products (Site not responding. Last check: 2007-11-03)
		GCP was originally established in 1967 to provide quality precast-prestressed concrete components for the bridge, marine, and structural industries.
		GCP is fully certified by the Precast/Prestressed Concrete Institute (PCI) which gives GCP the confirmed capability for the manufacture of concrete products as measured three times each year by PCI.
		We are continually meeting prestressed concrete challenges throughout the entire Gulf South.
	www.gcprestress.com (298 words)

	Precast / Prestressed Concrete Equipment
		Our Heavy-Duty concrete form vibrators and vibratory sleds are extra heavy-duty, for longer life in rough conditions, and our Automatic Rebar Tier tool makes tying faster, easier, and more consistent.
		The Dual Roller style unit is the standard in external form vibration.
		quality concrete vibration equipment at the best price, but we can recommend mounting systems, utilizing the best type and properly sized external vibrators.
	www.go-mpsinc.com /concrete.htm (282 words)

	NOVA Online \| Super Bridge \| How prestressed concrete is made (1)
		It all begins at the prestressed concrete plant.
		The prestressing strand is stretched across the casting bed.
		About 30,000 pounds of tension will be applied to the cable before it's surrounded by concrete.
	www.pbs.org /wgbh/nova/bridge/concrete.html (92 words)

	Stahlton Prestressed Concrete Systems
		The wide product range which includes Corslab hollowcore, tees, double tees, rib and infill and flat slabs, is suitable for most types of buildings and structures and reflects 40 years of expertise in prestressed concrete throughout New Zealand and the South Pacific.
		Stahlton precast concrete systems are used in: offices, shops, apartments, houses, factories, car parks, decks, parking buildings, hospitals, sports stadia, warehouses, shopping centres, freezing works and cool stores.
		Stahlton concrete shell beams (U Beams) are manufactured in a range of sizes and can be tailored to suit most types of building.
	www.stahlton.co.nz (274 words)

	Rainbow Concrete Industries Ltd.
		These products include ready-mix concrete, bulk aggregates, concrete pipes and structures, prestressed slabs (Granite Prestressed Concrete Limited), standard and custom precast, shotcrete, packaged materials and a variety of landscaping products.
		This will be achieved through the development of long-term partnerships with our customers, and together we will benefit from our objectives of continuous improvement and innovation.
		Canadian Standards Association (CSA) certified concrete testing laboratory, as well developed quality assurance program, and the most current computer technology, along with excellent support staff enables us to implement this mission statement, as well as, provide technical support in the field when required.
	www.rainbow-concrete.com (235 words)

	Prestressed
		restressed concrete is one of the most reliable, durable, and widely used construction materials in building and bridge projects around the world.
		This second edition of “Prestressed Concrete Analysis and Design: Fundamentals” is completely updated and expanded.
		It emphasizes the fundamental concepts of analysis and design of prestressed concrete structures, providing the user with the essential knowledge and tools to deal with everyday design problems, while encouraging the necessary critical thinking to tackle more complex problems with confidence.
	www.technopress3000.com /prestressed.htm (590 words)

	National Prestressed Concrete Products
		Manufacture and of pre-fabricated concrete structures and components for the building industry.
		Manufacture and installation of pre-fabricated concrete components for the building industry.
		concrete decks, platforms, parking garages, walkways and many other structures.
	www.usarchitecture.com /building_supplies/concrete/prestressed_concrete.htm (369 words)

	Prestressed Concrete and Precast Concrete
		We specialize in both structural and architectural concrete products, as well as a combination of the two in one single product.
		We have produced hundreds of projects since 1957, and have extensive experience in the use of prestressed concrete products.
		Prestressed Casting Company is a Producer Member of the Precast/Prestressed Concrete Institute.
	www.prestressedcasting.com /aboutus.php (180 words)

	PCI Journal
		The PCI Journal informs you with the latest authoritative information on precast and prestressed concrete research, design, construction and industry developments.
		For nearly 50 years, the PCI Journal has been recognized throughout the world as the single key source of recommended practices and standards, in-depth descriptions of noteworthy new structures, design and construction innovations, data on new materials and production methods, reports on technical developments and industry-wide news.
		Nowhere else in any other publication is the world-wide precast and prestressed concrete industry and its technology so thoroughly covered in all aspects.
	www.pci.org /publications/journal (172 words)

	Amazon.com: Prestressed Concrete : A Fundamental Approach (5th Edition): Books: Edward G Nawy (Site not responding. Last check: 2007-11-03)
		It is not a book that should be used to learn prestressed concrete design however.
		Sure there may be some typographical errors, but the subject of prestressed concrete design is itself complex and detailed.
		To address the complexity, the author lays down systematic methods that, in the end, is only limited to the abilities of professionals and students who use them.
	www.amazon.com /exec/obidos/tg/detail/-/0131497596?v=glance (1358 words)

	Prestressed Concrete (Site not responding. Last check: 2007-11-03)
		Prerequisites: Part IIA Paper G2, and preferably Module A7 To teach the principles of analysis and design of prestressed concrete, which is principal way of using concrete for large structures, such as bridges.
		This will consist of two parts (i) carrying out a test on a prestressed concrete beam, plus a write-up, and (ii) a short design exercise.
		* Be aware of the potential developments in new materials for prestressed concrete and the reasons for their adoption.
	www-h.eng.cam.ac.uk /modules/IIB/groupA/A8.html (232 words)

	Prestressed Concrete and Precast Concrete
		The company provides a wide variety of both structural and architectural products including flatslab walls and decks, double tee walls and decks, columns, rectangular and inverted tee beams, stadium riser seating sections, and a variety of spandrels, fascias, and claddings.
		Prestressed Casting Company is the one of the very few mid-west precasters providing both PCI certified products as well as in-house PCI qualified product erection.
		Precast concrete provides all of the advantages of concrete construction (durability, fire/wind resistance, low maintenance and security) while providing quality, schedule, and cost advantages over the other concrete construction alternatives of cast-in-place, post-tension, or tilt-up.
	www.prestressedcasting.com (263 words)

	Publications - CPCI - Canadian Precast Prestressed Concrete Institute0 (Site not responding. Last check: 2007-11-03)
		Since the Second Edition of the CPCI Metric Design Manual was published in 1987, there have been significant changes in the state of the art for precast, prestressed concrete.
		There have also been important changes to CSA Standard A23.3-94 "Design of Concrete Structures" that recognize the benefits of quality control in certified precast concrete plants.
		The concrete resistance factor for precast concrete produced in a CSA certified precast plant has increased from 0.60 to 0.65.
	www.cpci.ca /?sc=publications (583 words)

	Method and apparatus for retensioning prestressed concrete members (US4604003)
		A jack is provided to apply the tension to the strand.
		The prestressed concrete members such as piling, may be spliced together by using the apparatus on adjoining ends of piling.
		A method of retensioning the development length of pre-tensioned strands embedded in and bonded to the concrete of an elongated, prestressed concrete member comprising the steps of:
	www.delphion.com /details?&pn=US04604003__ (237 words)

	SP-231 Ned H Burns Symposium on Historical Innovations in Prestressed Concrete
		This Special Publication of the American Concrete Institute consists of papers accepted for the Ned H. Burns Symposium on Historic Innovations in Prestressed Concrete.
		The collection of papers in this volume presents a range of topics describing historic innovations in prestressed concrete over the past half-century.
		Topics include early uses of prestressed concrete by industry pioneers in Europe and the United States, development of construction techniques and design standards for several different prestressed concrete applications, and the use of innovative modern materials such as self-consolidating concrete and fiber-reinforced polymers.
	www.aci-int.org /PUBS/newpubs/SP231.htm (146 words)

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