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1、Reported by Joint ACI-ASCE Committee 423 ACI 423.7-07 Specification for Unbonded Single-Strand Tendon Materials and Commentary An ACI Standard Specification for Unbonded Single-Strand Tendon Materials and Commentary First Printing January 2008 ISBN 978-0-87031-265-6 American Concrete Institute Advan
2、cing concrete knowledge Copyright by the American Concrete Institute, Farmington Hills, MI. All rights reserved. This material may not be reproduced or copied, in whole or part, in any printed, mechanical, electronic, film, or other distribution and storage media, without the written consent of ACI.
3、 The technical committees responsible for ACI committee reports and standards strive to avoid ambiguities, omissions, and errors in these documents. In spite of these efforts, the users of ACI documents occasionally find information or requirements that may be subject to more than one interpretation
4、 or may be incomplete or incorrect. Users who have suggestions for the improvement of ACI documents are requested to contact ACI. Proper use of this document includes periodically checking for errata at www.concrete.org/committees/errata.asp for the most up-to-date revisions. ACI committee documents
5、 are intended for the use of individuals who are competent to evaluate the significance and limitations of its content and recommendations and who will accept responsibility for the application of the material it contains. Individuals who use this publication in any way assume all risk and accept to
6、tal responsibility for the application and use of this information. All information in this publication is provided “as is” without warranty of any kind, either express or implied, including but not limited to, the implied warranties of merchantability, fitness for a particular purpose or non-infrin
7、gement. ACI and its members disclaim liability for damages of any kind, including any special, indirect, incidental, or consequential damages, including without limitation, lost revenues or lost profits, which may result from the use of this publication. It is the responsibility of the user of this
8、document to establish health and safety practices appropriate to the specific circumstances involved with its use. ACI does not make any representations with regard to health and safety issues and the use of this document. The user must determine the applicability of all regulatory limitations befor
9、e applying the document and must comply with all applicable laws and regula- tions, including but not limited to, United States Occupational Safety and Health Administration (OSHA) health and safety standards. Order information: ACI documents are available in print, by download, on CD-ROM, through e
10、lectronic subscription, or reprint and may be obtained by contacting ACI. Most ACI standards and committee reports are gathered together in the annually revised ACI Manual of Concrete Practice (MCP). American Concrete Institute 38800 Country Club Drive Farmington Hills, MI 48331 U.S.A. Phone:248-848
11、-3700 Fax:248-848-3701 www.concrete.org ACI 423.7-07 supersedes the material-related specification information contained in ACI 423.6-01, became effective October 2007, and was published January 2008. Copyright 2007, American Concrete Institute. All rights reserved including rights of reproduction a
12、nd 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 sound or visual reproduction or for use in any knowledge or retrieval system or device, unless permission in writing is obtained
13、 from the copyright proprietors. 423.7-1 ACI Committee Reports, Guides, Manuals, Standard Practices, and Commentaries are intended for guidance in planning, designing, executing, and inspecting construction. This document is intended for the use of individuals who are competent to evaluate the signi
14、ficance and limitations of its content and recommendations and who will accept responsibility for the application of the material it contains. The American Concrete Institute disclaims any and all responsibility for the stated principles. The Institute shall not be liable for any loss or damage aris
15、ing therefrom. Reference to this document shall not be made in contract documents. If items found in this document are desired by the Architect/Engineer to be a part of the contract documents, they shall be restated in mandatory language for incorporation by the Architect/Engineer. Specification for
16、 Unbonded Single-Strand Tendon Materials (ACI 423.7-07) and Commentary An ACI Standard Reported by Joint ACI-ASCE Committee 423 ACI 423.7-07 ACI Specification 423.7-07 and Commentary are presented in a two-column format, with Specification text in the left column, and corresponding Commentary text i
17、n the right column. To distinguish the Specification from the Commentary, the Specifi- cation is printed in Helvetica, which is the typeface for this paragraph. NOTES TO SPECIFIER This Specification is incorporated by reference in the Project Specifications using the wording in P3 of the Preface and
18、 including the information from the mandatory and optional checklists following this specification. PREFACE P1. ACI Specification 423.7 is intended to be used by reference or incorporation in its entirety in the Project Spec- ification. Do not copy individual Parts, Sections, Articles, or Paragraphs
19、 into the Project Specification, because taking them out of context may change their meaning. P2. If Sections or Parts of ACI Specification 423.7 are copied into the Project Specification or any other document, do not refer to them as an ACI Specification, because the specification has been altered.
20、 P3. A statement such as the following will serve to make ACI Specification 423.7 a part of the Project Specification: “Work on (Project Title) shall conform to all requirements of ACI 423.7-07 published by the American Concrete Insti- tute, Farmington Hills, Michigan, except as modified by these Co
21、ntract Documents.” P4. Each technical Section of ACI Specification 423.7 is written in the two-part Section format of the Construction Theresa M. AhlbornHenry J. Cronin, Jr.Donald P. KlineThomas C. Schaeffer Robert W. BarnesCharles W. DolanWard N. Marianos, Jr.Andrea J. Schokker Florian G. BarthMart
22、in J. FraduaMark E. MooreMorris Schupack Sarah L. BillingtonWilliam L. GambleAntoine E. NaamanRichard W. Stone Kenneth B. BondyPawan R. GuptaTheodore L. NeffH. Carl Walker Ned H. BurnsH. R. Trey Hamilton IIIThomas E. NehilCarin L. Roberts-Wollmann Gregory P. ChacosMohammad IqbalSami H. RizkallaPaul
23、Zia Steven R. CloseL. S. Paul JohalDavid H. Sanders Bruce W. Russell Chair Shawn P. Gross Secretary The Commentary is printed in Times Roman, which is the typeface for this paragraph. Commentary section numbers are preceded by the letter “R” to distinguish them from Specification section numbers. Th
24、e Commentary is not a part of ACI Specification 423.7-07. 423.7-2ACI STANDARD Specifications Institute, as adapted for ACI requirements. The language is imperative and terse. P5. The Specification is written to the Contractor. When a provision of this specification requires action on the Contractors
25、 part, the verb “shall” is used. If the Contractor is allowed to exercise an option when limited alternatives are available, the phrasing “either. or.” is used. Statements provided in the Specification as information to the Contractor use the verbs “may” or “will.” Informational state- ments typical
26、ly identify activities or options that “will be taken” or “may be taken” by the Owner or the Architect/ Engineer. CONTENTS Part 1General, p. 423.7-3 1.1Scope 1.2Definitions 1.3Referenced standards/R1.3Cited references 1.4System description 1.5Submittals 1.6Fabrication 1.7Handling, storage, and shipp
27、ing Part 2Products, p. 423.7-11 2.1Prestressing steel 2.2Post-tensioning coating 2.3Sheathing 2.4Anchorages and couplers 2.5Tendons in aggressive environments 2.6Anchorage assembly testing Foreword to checklists, p. 423.7-21 Mandatory requirements checklist, p. 423.7-21 Optional requirements checkli
28、st, p. 423.7-21 UNBONDED SINGLE-STRAND TENDON MATERIALS AND COMMENTARY423.7-3 SPECIFICATIONCOMMENTARY 1.1 Scope This Specification provides materials criteria and fabrication requirements for unbonded single-strand tendons used in nonaggressive and aggressive environments. This Specification is not
29、intended to apply to nonstruc- tural elements and applications, which might include topping slabs, waterproofing slabs-on-fill, and post- tensioning used only for control of cracking or deflection. For nonflexural or membrane type structures primarily under tensile forces, the provisions apply where
30、 appropriate. UnitsValues 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 only, and are not considered standard. R1.1 Scope This Specification provides unbonded post-tensioned material re
31、quirements for most structural uses. It is not intended to apply to post-tensioned slabs-on-ground for light residential construction. Structures are considered to be exposed to aggressive environments when they are subjected to direct or indirect applications of deicing chemicals, seawater, brackis
32、h water, or spray from these sources; structures in the immediate vicinity of coastal ways exposed to salt-laden air; and struc- tures where anchorage areas are in direct contact with soil. Stressing pockets that are not in a condition considered dry after construction is complete should be consider
33、ed to be exposed to an aggressive environment. Nearly all enclosed buildings, such as buildings with exterior cladding, are considered to be nonaggressive environments. The Engineer decides if the structure, or a part of the structure, is exposed to an aggressive environment. Attention should be pai
34、d to such areas as the location of stressing-end, fixed-end and intermediate anchors, construction joints, planters, balconies, and swimming pools. The more rigorous material and fabrica- tion requirements for tendons used in aggressive environments are essential for the long-term durability of tend
35、ons used in such circumstances. This Specification should be considered a minimum standard and, based on experience or project considerations, may be made more restrictive by the Engineer. PART 1 GENERAL 1.2Definitions anchoragea mechanical device comprising all components required to anchor the pre
36、stressing steel and permanently transfer the post-tensioning force from the prestressing strand to the concrete. anchorage, fixed-endanchorage located at end of tendon where stressing of tendon is not required. anchorage, intermediateanchorage located between the ends of the tendon for application o
37、f post- tensioning force. anchorage, stressing-endanchorage at one end or both ends of tendon where stressing of tendon is required. concrete, prestressedstructural concrete in which internal stresses are introduced to reduce potential concrete tensile stresses resulting from loads. 423.7-4ACI STAND
38、ARD SPECIFICATIONCOMMENTARY couplera mechanical device that connects ends of two strands together, thereby transferring the post- tensioning force from one strand to the other strand. Engineerlicensed design professional responsible for the structural design of the post-tensioned concrete members on
39、 the project. environment, aggressivean environment in which structures are exposed to direct or indirect applica- tions of deicing chemicals, seawater, brackish water, or spray from these water sources; and salt-laden air as occurs in the vicinity of coastal ways. Aggressive environments also inclu
40、de structures where stressing pockets are wetted or are directly in contact with soils. environment, nonaggressiveenvironments not defined as aggressive, including buildings where the concrete frame is fully enclosed by facades or cladding. post-tensioningmethod of prestressing in which prestressing
41、 steel is tensioned after concrete has hardened. post-tensioning coatingmaterial used to protect against corrosion and reduce friction between prestressing steel and sheathing. post-tensioning installercontracting entity respon- sible for the post-tensioning materials at the job site at all stages,
42、including unloading, handling, storage, placement, tendon installation, stressing, and tendon finishing in accordance with the contract documents. post-tensioning suppliercontracting entity responsible for providing all components of the post- tensioning system including the tendons, anchorages, cou
43、plers, installation drawings, and stressing equipment, and delivering them to the job site. prestressing steelhigh-strength steel, most commonly a seven-wire strand, used to impart prestress forces to concrete. sheathinga material encasing prestressing steel to prevent bonding of the prestressing st
44、eel with the surrounding concrete, to provide corrosion protection, and to contain the post-tensioning coating. sleevedevice for connecting sheathing to anchorage. tendonin post-tensioned applications, the tendon is a complete assembly consisting of anchorages, prestressing steel, post-tensioning co
45、ating, and sheathing. UNBONDED SINGLE-STRAND TENDON MATERIALS AND COMMENTARY423.7-5 SPECIFICATIONCOMMENTARY tendon, encapsulateda tendon that is completely enclosed in a watertight covering from end to end, including anchorages and sheathing with coating for unbonded applications or ducts with grout
46、 for bonded applications. tendon tailportion of tendon extending beyond end anchorage. tendon, unbondedtendon in which prestressing steel is prevented from bonding to concrete, and is free to move relative to concrete. The longitudinal prestressing force is permanently transferred to concrete at the
47、 tendon ends by the anchorages only. 1.3 Referenced standards American Concrete Institute 318-05Building Code Requirements for Structural Concrete ASTM International A370-07aStandard Test Methods and Defini- tions for Mechanical Testing of Steel Products A416/A416M-06 Standard Specification for Stee
48、l Strand, Uncoated Seven-Wire for Prestressed Concrete B117-07Standard Practice for Operating Salt Spray (Fog) Apparatus C1077-06aStandard Practice for Laboratories Testing Concrete and Concrete Aggregates for Use in Construction and Criteria for Laboratory Evaluation D92-05a Standard Test Method fo
49、r Flash and Fire Points by Cleveland Open Cup Tester D95-05e1Standard Test Method for Water in Petroleum Products and Bituminous Materials by Distillation D512-04 Standard Test Methods for Chloride Ion in Water D566-02 Standard Test Method for Dropping Point of Lubricating Grease D610-07 Standard Test Method for Evaluating Degree of Rusting on Painted Steel Surfaces R1.3 Cited references ACI Committee 318, 2005, “Building Code Requirements for Structural Concrete (ACI 318-05) and Commentary (ACI 318R-05),” American Concrete Institute, Farmin