BS ISO 14824-1-2012 Grout for prestressing tendons Basic requirements《预应力钢筋束用灌浆 基本要求》.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 14824-1:2012Grout for prestressing tendonsPart 1: Basic requirementsBS ISO 14824-1:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of

2、ISO 14824-1:2012. The UK participation in its preparation was entrusted to T e c h n i c a l Committee B/525/2, Structural use of concrete.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary

3、provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012. Published by BSI Standards Limited 2012.ISBN 978 0 580 72057 4 ICS 91.100.30 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was

4、 published under the authority of the Standards Policy and Strategy Committee on 30 November 2012.Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 14824-1:2012 ISO 2012Grout for prestressing tendons Part 1: Basic requirementsCoulis pour cbles de prcontrainte Partie 1: Exigences

5、essentiellesINTERNATIONAL STANDARDISO14824-1First edition2012-10-01Reference numberISO 14824-1:2012(E)BS ISO 14824-1:2012ISO 14824-1:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unless otherwise specified, no part of this publication may be reproduc

6、ed or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01

7、11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 14824-1:2012ISO 14824-1:2012(E) ISO 2012 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Materials . 14.1 General . 14.2 Cement . 1

8、4.3 Water . 24.4 Admixtures . 24.5 Additions 25 Batching and mixing of grout 26 Properties of grout . 36.1 General . 36.2 Sieve test . 36.3 Fluidity . 46.4 Bleeding 46.5 Volume change 46.6 Strength . 46.7 Setting time 46.8 Density . 57 Evaluation of conformity 57.1 Production control . 57.2 Initial

9、type testing 57.3 Audit testing 6Bibliography 7BS ISO 14824-1:2012ISO 14824-1:2012(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out thro

10、ugh ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collabor

11、ates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standard

12、s. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of the elements of this

13、 document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 14824-1 was prepared by Technical Committee ISO/TC 71, Concrete, reinforced concrete and pre-stressed concrete, Subcommittee SC 3, Concrete production and execution of c

14、oncrete structures.ISO 14824 consists of the following parts, under the general title Grout for prestressing tendons: Part 1: Basic requirements Part 2: Grouting procedures Part 3: Test methodsiv ISO 2012 All rights reservedBS ISO 14824-1:2012ISO 14824-1:2012(E)IntroductionIn post-tensioned prestres

15、sed concrete construction, the grouting of tendons is an important operation. The intention of this part of ISO 14824 is to provide basic requirements for the approval of cement grouts, compliance with which will satisfy the requirements in ISO 22966.The main function of grouting is to: protect the

16、prestressing steel against corrosion; provide a bond between the prestressing steel and the ducts where required for the design of the structure; allow transfer of compressive stresses in the structure in a direction transverse to internal tendons; fill all voids where water may accumulate and cause

17、 frost damage.The testing regimes anticipated by this part of ISO 14824 include three levels:(1) initial type and audit testing in accordance with this part of ISO 14824;(2) suitability testing for confirmation of the selected grout for a specific project in accordance with ISO 14824-2;(3) inspectio

18、n during grouting works on a specific project in accordance with ISO 14824-2.The test methods for each of the regimes are given in ISO 14824-3.In some countries requirements exist for independent third-party certification of grout and grouting procedures which should be set out in national requireme

19、nts to supplement ISO 22966.Certain special structures or tendon configurations can require grouts with enhanced performance. Any resulting necessary amendment of the requirements of this part of ISO 14824 needs to be included in the execution specification. ISO 2012 All rights reserved vBS ISO 1482

20、4-1:2012BS ISO 14824-1:2012Grout for prestressing tendons Part 1: Basic requirements1 ScopeThis part of ISO 14824 covers the materials that may be used in the manufacture of cement grouts and the required properties and composition of the grout. It is applicable to grouting of tendons in all types o

21、f structures, including bridges and buildings.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any am

22、endments) applies.ISO 9597, Methods of testing cement Determination of setting times and soundnessISO 22965-2, Concrete Part 2: Specification of constituent materials, production of concrete and compliance of concreteISO 14824-3, Grout for prestressing tendons Part 3: Test methodsISO 12439, Mixing w

23、ater for concrete3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1grouthomogeneous mixture of cement and water, which may contain admixtures and additions3.2tendonassembly of prestressing steel and sheath with anchorages and all necessary auxilia

24、ry components to permit grouting, either placed internally or externally to the concrete structure4 Materials4.1 GeneralMaterials shall have a general suitability in accordance with ISO 22965-2.4.2 CementCement shall be Portland cement or any other type of cement permitted for grouting of tendons wh

25、ich complies with national standards in the place of use of the grout. The cement type shall be declared.INTERNATIONAL STANDARD ISO 14824-1:2012(E) ISO 2012 All rights reserved 1BS ISO 14824-1:2012ISO 14824-1:2012(E)4.3 WaterWater shall comply with ISO 12439.4.4 AdmixturesAdmixtures shall have an es

26、tablished suitability for use in grouts. It shall be permissible to use admixtures singly or in combination. Admixtures shall only be used according to the admixture manufacturers instructions unless any variation is proven satisfactory by testing and approved by the manufacturer.4.5 AdditionsGrout

27、complying with this part of ISO 14824 may contain silica fume.If permitted in the place of use, grout may contain other additions intended for use in concrete in accordance with ISO 22965-2. The type and amount of additions shall be declared.5 Batching and mixing of groutMaterials may be batched and

28、 mixed on site to fabricate grout. Alternatively, the dry materials may be batched in a factory for ready-mixed grout and mixed with the liquid materials on site to fabricate grout.All materials shall be batched by mass except the mixing water and liquid admixtures which may be batched by mass or vo

29、lume. The accuracy of batching shall be 2 % for cement, dry admixtures and additions, 1 % for water and liquid admixtures,of the quantities specified.Water contained in liquid admixtures shall be declared and it shall be stated whether it is included in the calculation of water/cement (w/c) ratio.Al

30、l pozzolanic materials used as separate ingredients shall be included in the calculation of w/c ratio in accordance with the procedures in ISO 22965-2.Mixing shall be carried out mechanically with suitable equipment to obtain a homogeneous and stable grout with the plastic properties given in Clause

31、 6.For any grout fabricated in accordance with this part of ISO 14824 the following information shall be declared by the grout manufacturer: mix proportions of materials; w/c ratio and its acceptable variation; sequence of introducing the materials, type of mixer and mixing time; range of temperatur

32、e for which the grout complies with this part of ISO 14824.NOTE 1 Grouts complying with this part of ISO 14824 normally have a w/c ratio below 0,45.NOTE 2 ISO 14824-2 requires suitability testing to be carried out using the same type of mixing equipment as is used for the actual project operations.

33、Hence, it is preferable to also use the same type of equipment for all testing as far as possible.2 ISO 2012 All rights reservedBS ISO 14824-1:2012ISO 14824-1:2012(E)6 Properties of grout6.1 GeneralThe grout shall not contain more than: chloride (Cl-) 0,10 % by mass of cement; sulfate (as SO3) 4,5 %

34、 by mass of cement; sulfide (S2-) 0,04 % by mass of cement where ordinary Portland cement is used. Where other cements are permitted the sulfide limit shall be according to national requirements and described in the Execution Specification.These values are the summation of the chloride, sulfates, su

35、lfites and sulfides occurring in the constituent materials.Grout shall comply with the requirements given in 6.2 to 6.8 for: sieve test; fluidity; bleeding; volume change; strength; setting time; fluid density.Testing shall be in accordance with ISO 14824-3.Other test methods may be used if the corr

36、elation or safe relationship between the results of these test methods and the reference methods of ISO 14824-3 have been established.The performance requirements of 6.2 to 6.8 shall be satisfied for the range of conditions of temperature as declared by the grout manufacturer.Grout shall be tested a

37、s specified in this part of ISO 14824 or in the project specification at the following ambient temperatures: reference temperature (20 2) C or (27 2) C for hot/tropical climates; lowest temperature declared by the manufacturer (1/+3) C; highest temperature declared by the manufacturer (3/+3) C.For p

38、re-bagged grout, the range of suitable temperature shall be stated on the package or accompanying records.In the absence of specified maximum and minimum ambient temperatures, it is recommended to use 15 C above and below the reference temperature6.2 Sieve testGrout shall be tested according to ISO

39、14824-3 and no lumps shall remain in the sieve. ISO 2012 All rights reserved 3BS ISO 14824-1:2012ISO 14824-1:2012(E)6.3 FluidityThe fluidity of the grout during the injection period shall be measured by either one of the methods given in ISO 14824-3 and the grout shall have the values given in Table

40、 1.Fluidity should not change by more than 20 % from immediately after mixing to 30 min after mixing or any later time specified by the grout manufacturer.Where grout for special applications is required to remain fluid for significantly longer periods prior to injection the grout manufacturer shall

41、 declare the applicable time and limits (1,2 and 0,8) for the later test.Where the suitability of high viscosity grout is proven by full-scale trials, alternative limits to those in Table 1 shall be declared by the grout manufacturer.Table 1 Fluidity test requirementsTest method given in EN 445Immed

42、iately after mixing30 min after mixing aor at the time specified by the grout manufacturerCone Grout spreadTime (in s) a = average spread (in mm)t0 25 s a0 140 mm1,2 t0 t30 0,8 t0and t30 25 s 1,2 a0 a30 0,8 a0and a30 140 mmaMixing time shall be measured from the time when all materials are in the mi

43、xer.Grout shall be kept constantly in motion until sampling for measurement of t30and a30.NOTE Fluidity measurements immediately after mixing are denominated t0(cone method) and a0(grout spread method), fluidity measurements made 30 min after mixing, i.e. 30 min after the first measurements, are den

44、ominated t30and a30.6.4 BleedingThe bleeding of the grout shall be sufficiently low to prevent excessive segregation and sedimentation of the grout materials.When tested by the wick-induced method given in ISO 14824-3, for the average of three results the bleeding shall not exceed 0,3 % of the initi

45、al volume of the grout after 3 h kept at rest.When tested by the inclined tube test method given in ISO 14824-3, the bleeding shall not exceed 0,3 % of the initial volume of the grout after 3 h kept at rest.6.5 Volume changeThe volume change assessed may be either an increase or decrease. When teste

46、d in accordance with the method given in ISO 14824-3 the volume change of the grout at rest for 24 h shall be within the range of - 1 % and + 5 %.6.6 StrengthThe compressive strength of grout assessed according to ISO 14824-3 shall be not less than 30 N/mm2at 28 days or 27 N/mm2at 7 days if it is pr

47、oposed to estimate the likely 28 day strength at 7 days.NOTE The 7-day strength requirement is not mandatory if the 28-day strength requirement is met.6.7 Setting timeSetting time of grout shall be measured according to ISO 9597 and shall comply with the following: initial set of the grout, 3 h;4 IS

48、O 2012 All rights reservedBS ISO 14824-1:2012ISO 14824-1:2012(E) final set of the grout, 24 h.For special applications a longer period to final set may be required in which case the time shall be declared by the manufacturer.6.8 DensityFluid density shall be measured in accordance with the method gi

49、ven in ISO 14824-3 and shall be declared.7 Evaluation of conformity7.1 Production controlThe grout manufacturer shall exercise internal control of the grout fabrication. The requirements shall be documented. This requirement applies to grout dry-batched in a factory and to grout batched on site. Type and frequency of checks shall be considered as a function of the production process.Incoming materials shall be checked for compliance with the specification.Products that are considered a