1、ACI 423.7-14Specification for Unbonded Single-Strand Tendon MaterialsReported by Joint ACI-ASCE Committee 423An ACI StandardFirst PrintingNovember 2014ISBN: 978-0-87031-961-7Specification for Unbonded Single-Strand Tendon MaterialsCopyright by the American Concrete Institute, Farmington Hills, MI. A
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11、he annually revised ACI Manual of Concrete Practice (MCP).American Concrete Institute38800 Country Club DriveFarmington Hills, MI 48331Phone: +1.248.848.3700Fax: +1.248.848.3701www.concrete.orgThis material specification provides materials criteria and fabrica-tion requirements for unbonded single-s
12、trand tendons.Keywords: fabrication; post-tensioning; PT coating; tendon; unbonded.CONTENTS1SCOPE, p. 21.1, p. 21.2, p. 21.3, p. 21.4, p. 22DEFINITIONS, p. 22.1, p. 23REFERENCED STANDARDS, p. 33.1American Concrete Institute, p. 33.2ASTM International, p. 33.3International Organization for Standardiz
13、ation, p. 33.4Federal Test Method Standard, p. 34ORDERING INFORMATION, p. 34.1, p. 35MATERIALS, p. 45.1Prestressing steel, p. 45.2Post-tensioning (PT) coating, p. 45.3Sheathing, p. 45.4Anchorages and couplers, p. 45.5Connecting components, p. 45.6Tape, p. 46MANUFACTURE, p. 46.1Minimum quantity of po
14、st-tensioning (PT) coating, p. 46.2Manufacturing processes, p. 46.3Sheathing coverage, p. 46.4Nonencapsulated systems, p. 56.5Encapsulated systems, p. 57MECHANICAL PROPERTIES, p. 57.1Prestressing steel, p. 57.2Post-tensioning (PT) coating, p. 58DIMENSIONS, DENSITY, AND PERMISSIBLE VARIATIONS, p. 58.
15、1Prestressing steel, p. 58.2Sheathing, p. 58.3Anchorages, p. 58.4Connecting components, p. 69ANCHORAGE ASSEMBLY TESTING, p. 7Carin L. Roberts-Wollmann, Chair Amy M. Reineke Trygestad, SecretaryACI 423.7-14Specification for Unbonded Single-Strand Tendon MaterialsAn ACI StandardReported by Joint ACI-A
16、SCE Committee 423Theresa M. AhlbornRobert W. BarnesFlorian G. BarthAsit N. BaxiRoger J. BeckerKenneth B. BondyCharles W. DolanJames P. DonnellyPierre EsselinckMartin J. FraduaWilliam L. GambleHarry A. GleichShawn P. GrossPawan R. GuptaWilliam M. HaleH. R. Trey Hamilton IIICarol HayekMohammad IqbalDo
17、nald P. KlineLarry B. KrauserJason J. KrohnMark E. Moore*Theodore L. Neff Sami H. RizkallaJames RogersBruce W. RussellDavid H. SandersThomas C. SchaefferMorris Schupack*Richard W. StoneMiroslav F. VejvodaJeffrey S. VolzH. Carl WalkerZuming XiaPaul ZiaConsulting MembersRobert N. Bruce Jr.Ned H. Burns
18、Chunsheng Steve CaiSteven R. CloseHenry J. Cronin Jr.Ward N. Marianos Jr.Hani MelhemAntoine E. NaamanThomas E. NehilAndrea J. Schokker_*DeceasedChair of subcommittee responsible for preparation of specification.ACI 423.7-14 supersedes ACI 423.7-07, became effective October 22, 2014, and was adopted
19、and published November 2014.Copyright 2014, American Concrete Institute.All rights reserved including rights of reproduction and use in any form or by any means, including the making of copies by any photo process, or by electronic or mechanical device, printed, written, or oral, or recording for so
20、und or visual reproduc-tion or for use in any knowledge or retrieval system or device, unless permission in writing is obtained from the copyright proprietors.19.1Validation, p. 79.2Components, p. 79.3Encapsulated systems, p. 79.4Static test, p. 79.5Fatigue test, p. 79.6Hydrostatic test, p. 710TESTI
21、NG SERVICES, p. 710.1Prestressing steel, p. 710.2Anchorage assembly, p. 711CERTIFICATION, p. 711.1, p. 712PACKAGING AND IDENTIFICATION, p. 812.1Bundling and banding, p. 812.2Identification of components, p. 813HANDLING, STORAGE, AND SHIPPING, p. 813.1Handling, p. 813.2Storage before shipping, p. 813
22、.3Shipping, p. 813.4Protection from moisture, p. 814INSTALLATION DRAWINGS, p. 81SCOPE1.1This specification provides materials criteria and fabrica-tion requirements for unbonded single-strand tendons.1.2This specification shall not apply to post-tensioned slab-on-ground, mat, or raft foundations on
23、expansive soils.NOTE 1For membrane-type structures primarily under tensile forces resulting from temperature effects and concrete shrinkage, the provisions apply where deemed appropriate by Architect/Engineer.1.3The text of this standard references notes and footnotes that provide explanatory materi
24、al. These notes and footnotes (excluding those in tables and figures) shall not be consid-ered as requirements of the standard.1.4Values stated in inch-pound units are to be regarded as standard. Values given in parentheses are mathematical conversion to SI Units that are provided for information on
25、ly, and are not considered standard.2DEFINITIONS2.1The following definitions govern in this specification. See “ACI Concrete Terminology” for additional definitions. http:/www.concrete.org/Tools/ConcreteTerminology.aspxanchoragea device used to maintain elongation in prestressing strand by transferr
26、ing compression force to concrete.Architect/Engineerthe architect, engineer, architec-tural firm, or engineering firm developing Contract Docu-ments or administering the Work under Contract Docu-ments, or both.Contract Documentsa set of documents supplied by Owner to Contractor as the basis for cons
27、truction; these documents contain contract forms, contract conditions, specifications, drawings, addenda, and contract changes.couplera mechanical device that connects ends of two strands together, thereby creating a continuous tendon by transferring the post-tensioning force from one strand to the
28、other strand.encapsulated tendona tendon that is completely enclosed in a watertight covering from end to end, including anchorages, sheathing, post-tensioning coating, sleeves, and an encapsulation cap over the strand tail at each end.encapsulation capplastic cap filled with post-tensioning coating
29、 that provides a watertight connection to all anchorages protecting the wedges and the tendon tail from moisture infiltration. The watertight connection shall include a mechanical interlock of a type that does not rely on friction alone to be held in place.fpuspecified tensile strength of prestressi
30、ng steel, psi (MPa).fixed anchorageanchorage located at end of tendon where stressing of tendon is not required (also known as dead-end anchorage).installation drawingsdrawings showing information about the specifics of the post-tensioning system and tendon placement such as the number, size, length
31、, marking, loca-tion, elongation, and tendon profiles (also referred to as shop drawings).intermediate anchorageanchorage located between the ends of the tendon for application of post-tensioning force.local zonerectangular prism (or equivalent rectangular prism for circular or oval anchorages) of c
32、oncrete immedi-ately surrounding the anchorage device and any confining reinforcement.non-encapsulated tendona tendon that has bare metallic anchorages, and sheathing that is continuous between anchorages but not connected to the anchorages.post-tensioningmethod of prestressing in which prestressing
33、 steel is tensioned after concrete has hardened.post-tensioning coatingmaterial used to protect the prestressing steel against corrosion and reduce friction between prestressing steel and sheathing.prestressed concretestructural concrete in which internal stresses are introduced to reduce potential
34、concrete tensile stresses resulting from loads.prestressing steelhigh-strength steel, most commonly a seven-wire strand, used to impart prestress forces to concrete.sheathingan extruded high-density polyethylene or polypropylene covering that encases prestressing steel to American Concrete Institute
35、 Copyrighted Material www.concrete.org2 SPECIFICATION FOR UNBONDED SINGLE-STRAND TENDON MATERIALS (ACI 423.7-14)prevent bonding of the prestressing steel with the surrounding concrete, to provide corrosion protection, and to contain the post-tensioning coating.sleevedevice for connecting sheathing t
36、o anchorage.strand tailprotruding length of strand outside of the wedges that remains in place after the tendon tail has been cut off.stressing anchorageanchorage at one end or both ends of tendon where stressing of tendon is required (also known as live-end anchorage)tendonin post-tensioned applica
37、tions, the tendon is a complete assembly consisting of anchorages, prestressing steel, post-tensioning coating, and sheathing.tendon tailprotruding length of strand outside of the stressing anchorage needed temporarily for stressing of the tendons.unbonded tendontendon in which prestressing steel is
38、 prevented from bonding to concrete, and is free to move relative to concrete. The longitudinal prestressing force is permanently transferred to concrete by the anchorages only.wedgespieces of tapered high-strength steel with serra-tions that bite into and grip the prestressing steel to transfer the
39、 prestressing force to the anchorage.wedge cavityopening in anchorage designed to accom-modate the prestressing steel passing through and housing the wedges.Workthe entire construction or separately identifi -able parts thereof required to be furnished under Contract Documents.3REFERENCED STANDARDS3
40、.1American Concrete InstituteACI 318-11Building Code Requirements for Structural ConcreteACI 350-06Code Requirements for Environmental Engineering Concrete Structures3.2ASTM InternationalASTM A416/A416M-12Standard Specification for Steel Strand, Uncoated Seven-Wire for Prestressed ConcreteASTM B117-
41、11Standard Practice for Operating Salt Spray (Fog) ApparatusASTM C1077-14Standard Practice for Laborato-ries Testing Concrete and Concrete Aggregates for Use in Construction and Criteria for Laboratory EvaluationASTM D92-12Standard Test Method for Flash and Fire Points by Cleveland Open Cup TesterAS
42、TM D95-13Standard Test Method for Water in Petro-leum Products and Bituminous Materials by DistillationASTM D512-12Standard Test Methods for Chloride Ion in WaterASTM D566-02(2009)Standard Test Method for Drop-ping Point of Lubricating GreaseASTM D610-08(2012)Standard Test Method for Eval-uating Deg
43、ree of Rusting on Painted Steel SurfacesASTM D638-10Standard Test Method for Tensile Prop-erties of PlasticsASTM D792-13Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by DisplacementASTM D2265-06Standard Test Method for Dropping Point of Lubricating Grease Over
44、 Wide Temperature RangeASTM D3867-09Standard Test Methods for Nitrite-Nitrate in WaterASTM D4289-13Standard Test Method for Elastomer Compatibility of Lubricating Greases and FluidsASTM D4658-09Standard Test Method for Sulfide Ion in WaterASTM D6184-98(2005)Standard Test Method for Oil Separation fr
45、om Lubricating Grease3.3International Organization for StandardizationISO/IEC Guide 65:1996General requirements for Bodies Operating Product Certification SystemsISO/IEC 17065:2012Conformity Assessment Requirements for Bodies Certifying Products, Processes and Services3.4Federal Test Method Standard
46、FTMS 791B Method 321.24ORDERING INFORMATION4.1It shall be the responsibility of the purchaser to specify all requirements that are necessary for the manufacture and delivery of the unbonded single-strand tendon under this specification. Such requirements to be considered include, but are not limited
47、 to, the submittal items in 4.1.1 through 4.1.6. Submittal item 4.1.1.1 shall be required unless specifi-cally excluded by the purchaser.4.1.1 Prestressing steel4.1.1.1 Certified mill test reports and typical load-elonga-tion curves for each coil or pack of strand used in fabrication of the tendons
48、containing the following information:a) Heat number and identificationb) Tensile strengthc) Yield stress at 1 percent extension under loadd) Elongation at failuree) Modulus of elasticityf) Diameter and net area of strandg) Type of material (normal or low-relaxation)4.1.1.2 Relaxation test results.4.
49、1.1.3 Samples from each heat (or manufacturers length, in the case of strands), properly marked, for verification of prestressing steel properties.4.1.1.4 Strand records related to material production containing the following information:a) Purchasing records showing the purchase of appropriate base materials used in productionb) Product traceability through production and shippingc) Testing results for tests required under 7.1 of this speci-fication, conformi
