A tendon comprises one or more strands, constrained at both ends by a compact, efficient and easily installed anchorage and encapsulated throughout within a duct. This manual will serve as a reference and guide to designers, inspectors and construction personnel for post tensioning materials, installation and grouting of bridge tendons. A resource on vertical tendons and excellent resource for many other items as well is the fhwa post tensioning tendon installation and grouting manual, may 20, fhwanhi 026. Pti acceptance standards for post tensioning systems pti specifications for grouting of post tensioned structures aashto lrfd bridge construction specification fdot standard provisions caltrans standard provisions fib bulletin 33 durability of post tensioning tendons. Post tensioning tendon installation and grouting manual, federal. Use only post tensioning systems that utilize tendons fully encapsulated in anchorages and ducts and fully filled with approved grout. Unbonded post tensioning system described herein is intended to perform without longterm corrosion or other distress in. After the prestressing steel is installed and stressed, the duct system shall be checked for. The tendon is the basic element of a post tensioning system. Fhwa 20, post tensioning tendon installation and grouting manual, federal highway administration fhwa, us department of transportation, washington d. One of the major advancements in bridge construction in the united states in the second half of the twentieth century was the development and use of prestressed concrete.
This manual includes stateoftheart information relative to materials, post tensioning systems, construction practices and grouting of post tensioning tendons for. Water reducing and expansion producing admixtures for grout are recommended, together with standpipes at all high points of the tendon, to assure elimination of voids. Our future vision pti envisions a future in which post tensioning is the first choice for reinforcing all structures. Recommendations for prestressed rock and soil anchors, 5 edition. Install castinplace concrete closure pours as shown in the contract plans and allow to reach a minimum compressive strength of 7. Pt system and approval process florida department of. This specification delineates four classes of grout that can be used for most post tensioning applications. This manual includes stateoftheart information relative to materials, post tensioning systems, construction practices and grouting of posttensioning tendons for. Bridges, posttensioning, tendons, grout, grouting, strands, bars, protection, ducts, inlets, outlets, tests, prestressed concrete, pretensioning, stressing.
Asbi federal highway administration fhwa manuals post tensioning tendon installation and grouting manual post tensioning tendon installation and grouting manual published by the post tensioning institute, this manual contains updated information on the current practices in the use, design, and construction of post tensioning. Posttensioning tendon installation and grouting manual by. The grouting is a very sensitive and receptive process that needs careful supervision and inspection. The figure to the right illustrates the concept of a diabolo and compares it to a conventional bent steel pipe deviator. The certification training goes a long way in preventing costly errors on projects. This manual includes stateoftheart information relative to. Dywidag posttensioning systems multistrand systems repair. For free electronic pdf download on the fhwa infrastructure website. When grout flows out at the intermediate vents, lock these vents in the direction of the grout flow. Furnish and install all post tensioning system components as shown in the contract documents, and any other pertinent items necessary for the particular post tensioning system used, including but not limited to ducts, anchorage assemblies, supplementary steel reinforcing bars and grout, to construct a post tensioned, slab bridge. Tensioning building structures march 12, 2020 2020 educode las vegas.
The design responsibility for elements 1 to 4 is typically shared between the bridge design engineer and the stay supplier. The document is part of the federal highway administrations national technology deployment program and may serve as a training manual. Pti post tensioning manual pdf posttensioning tendon installation and grouting manual. Post tensioning tendon installation and grounting manual. These conventional uses of post tensioning have been augmented by numerous applications of the system to projects such as stayed structures, offshore. External tendons with diabolos making something out of nothing. The tendons change their vertical location in the beam to follow the. Posttensioning tendon installation and grouting detaillevel. Grouted, post tensioned strands tendons are the backbone of these. This manual includes stateoftheart information relative to materials.
One corps, one regiment, one team posttensioning institute. Pdh quiz posttensioning installation and grouting manual. Posttensioning tendon installation and grouting manual now available for download or purchase now available. This manual shall be applied mainly to pc girder post tensioning and. Posttensioning tendon installation and grouting detail. Post tensioning is a method of reinforcing strengthening concrete or other materials with highstrength steel strands or bars, typically referred to as tendons.
Bridges, post tensioning, tendons, grout, grouting, strands, bars, protection, ducts, inlets, outlets, tests, prestressed concrete, pretensioning, stressing. This manual includes stateoftheart information relative to materials, post tensioning systems, construction practices and grouting of post tensioning tendons for bridges. Recommendations for prestressed rock and soil anchors, 5th edition matt niermann, p. Pdf posttensioning tendon installation and grouting. Posttensioning tendon installation and grouting manual this manual includes stateoftheart information relative to materials, posttensioning systems, construction practices and grouting of posttensioning tendons for bridges. With all tensioned structuralanchor systems, a major consideration is determining how deep to install the anchors. Tensioning grout problems wickinduced bleed test by american segmental bridge institute in april 2012 showing portland cement grout with about 4% bleeding after 24 hours of grouting operation. Posttensioning tendon installation and grouting manual federal. Post tensioning gained momentum in europe due to steel shortage. The tendons are the lifeline of post tensioned structures and grouts act as their last line of.
An anchor system that is too shallow may cause tension and cracking to occur along potential failure planes in the foundation, and a system too deep is uneconomical. Dywidag post tensioning systems are being developed and maintained by dywidagsystems international and are serviced and distributed by a worldwide network of subsidiaries, licensees and agents. Sp150145 new special provisions for posttensioning. Stressing unless otherwise indicated, do not start stressing until concrete has attained a compressive strength of no less than 75 percent of its 28day strength as confirmed by field cured test. In 5 information on an investigation of 10 bridges built in vienna between 1956 and 1978 is provided. The first edition of the post tensioning manual was published in 1972. Pdf posttensioning tendon installation and grouting manual. Use an approved post tensioning system, of proper size and type, to construct tendons as shown on the contract documents. In the photograph a general scheme is shown of a tendon consisting of two part tendons joined by a coupler. Mtaie external posttensioning anchorage mtaid electrically insulated anchorage, widely used and tested in the worlds biggest full scale application, the 4,3 km long piacenza viaduct. A tendon installed in a drilled and grouted hole in the ground soil or rock that is stressed after. Recommendations for prestressed rock and soil anchors, 5. The manual is targeted at federal, state and local transportation departments and private company personnel that may be involved in the design, inspection, construction, or maintenance of bridges that contain post.
Pti post tensioning manual pdf post tensioning tendon installation and grouting manual. Tendon encapsulation systems are constructed from plastic or galvanised steel materials, and are classified into two main types. It is substantially prestressed during production, in a manner that strengthens it against tensile forces which will exist when in service 35 this compression is produced by the tensioning of highstrength tendons located within or adjacent to the concrete and is done to improve the performance of the concrete in service. Do not substitute components of the approved post tensioning system. Post tensioning terminology ptt november 20 page 2 of 33 bearing plate, basic flat steel plate that transfers the tendon force directly into the concrete, meeting the analytical design requirements of pti acceptance standards for post tensioning systems, section 3. Post tensioning institute, recommendations for prestressed rock and soil anchors, fourth edition.
Posttensioning tendon installation and grouting manual by us. The first edition of the posttensioning manual was published in 1972. Pdh course posttensioning installation and grouting manual. After the prestressing steel is installed and stressed, the duct system shall be checke. Post tensioning tendon installation and grouting manual. Field procedure manual for unbonded single strand tendons. Mar 11, 2020 this manual will serve as a reference and guide to designers, inspectors and construction personnel for post tensioning materials, installation and grouting of bridge tendons. Asbi posttensioning tendon installation and grouting manual. Many of the components between systems using grout and flexible filler are identical. Post tensioning is one of the most widely used technologies in many major infrastructure projects. The responsibility for element 5 is normally also shared with the contractor.
External tendons with diabolos making something out of. Unbonded post tensioning system described herein is intended to perform without longterm corrosion or other distress in an aggressive environment as defined in the. Post tensioning since 1954, designers and constructors of bridges, buildings and civil engineering worldwide over have relied on the vsl multistrand post tensioning system. Federal highway administration posttensioning tendon. Morris schupack schupack associates stamford, connecticut the. Post tensioning institute document specification for grouting of post tensioned structures, pti m55. A post tensioning tendon is defined as a complete assembly consisting of the anchorages, the prestressing. Post tensioning materials and systems posttensioning tendon installation and grouting corrosion protection of post tensioning tendons this manual will serve as a reference and guide to designers, inspectors, and construction personnel for. Post tensioning quality construction procedures post tensioning and grouting testing. Following are some of the points that must be complied while practicing the grouting of the post tensioned concrete members. This manual shall be applied mainly to pc girder posttensioning and.
Lock the outlet hose when consistent grout flows out from it. This manual will serve as a reference and guide to designers, inspectors and construction personnel for post tensioning materials, installation and a grouting of bridge tendons. Site operatives employed by other contractors on the site shall not be used for post tensioning work. Mar 11, 2020 this manual includes stateoftheart information relative to. Before stressing and grouting internal or external tendons, install all grout caps, inlets. The manual provided the industry standard for the design and construction of.
Dywidag posttensioning systems multistrand systems. Post tensioning applications include office and apartment buildings, parking structures, slabsonground, bridges, sports stadiums, rock. All post tensioning and grouting shall be in accordance with pti m50. Tendons are tensioned after the concrete is poured. Prestressed concrete is a form of concrete used in construction. All work is to be in accordance with the details shown on the contract drawings and as directed by the engineer. The departments policy on post tensioning is provided in the structures manual, standard plans and standard specifications for road and bridge construction. December 2000 overview post tensioning is a method of reinforcing strengthening concrete or other materials with highstrength steel strands or bars, typically referred to as tendons. Method statement for post tensioning of concrete slab.
A total of more than 10,000 duct locations were opened locally, and the status of tendon grouting and tendon corrosion was recorded. Typical application typical retaining wall application utilizing ground anchors. Guide specification for grouted post tensioning method of measurement. Because quality is such an important part of a successful project, owners and specifiers are urged to require certified personnel. Post tensioning special provision instructions scdot. Grouting of bonded tendons shall comply with the post tensioning manual recommended practice for grouting of post tensioned prestressed concrete. The following information was used in the development of the content of the ddp. To find out more about post tensioning, contact the.
Jan 12, 2019 this manual will serve as a reference and guide to designers, inspectors and construction personnel for post tensioning materials, installation and grouting of bridge tendons. Fhwas post tensioning tendon installation and grouting manual, 2012. University of houston master construction specifications. Post tensioning tendon installation and grouting manual version 2. Grouted, posttensioned strandstendons are the backbone of these. The production also includes the st series anchorages, i. These four classes of grout and their recommend exposure conditions are.
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