BS ISO 14824-3-2012 Grout for prestressing tendons Test methods《预应力钢筋用泥浆 试验方法》.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 14824-3:2012Grout for prestressing tendonsPart 3: Test methodsBS ISO 14824-3:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 14

2、824-3:2012. 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 provis

3、ions 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 72059 8 ICS 91.100.30 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was publi

4、shed 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 14824-3:2012 ISO 2012Grout for prestressing tendons Part 3: Test methodsCoulis pour cbles de prcontrainte Partie 3: Mthodes dessaiINTERNAT

5、IONAL STANDARDISO14824-3First edition2012-10-01Reference numberISO 14824-3:2012(E)BS ISO 14824-3:2012ISO 14824-3:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in an

6、y 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 11Fax + 41 22 749 09

7、 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 14824-3:2012ISO 14824-3:2012(E) ISO 2012 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Testing of grout 1Bibliography .11BS ISO 14824-3:2012ISO 14824

8、-3:2012(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 through ISO technical committees. Each member body interested in a subject for

9、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 collaborates closely with the International Electrotechnical Commission (IEC) on al

10、l 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 Standards. Draft International Standards adopted by the technical committees are ci

11、rculated 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 document may be the subject of patent rights. ISO shall not be held respon

12、sible for identifying any or all such patent rights.ISO 14824-3 was prepared by Technical Committee ISO/TC 71, Concrete, reinforced concrete and pre-stressed concrete, Subcommittee SC 3, Concrete production and execution of concrete structures.ISO 14824 consists of the following parts, under the gen

13、eral title Grout for prestressing tendons: Part 1: Basic requirements Part 2: Grouting procedures Part 3: Test methodsiv ISO 2012 All rights reservedBS ISO 14824-3:2012ISO 14824-3:2012(E)IntroductionIn post-tensioned prestressed concrete construction, the grouting of tendons is an important operatio

14、n. The intention of this part of ISO 14824 is to provide a specification for grouting, compliance with which will satisfy the requirements in ISO 22966.The testing regimes anticipated by this part of ISO 14824 include three levels:(1) initial type and audit testing in accordance with ISO 14824-1;(2)

15、 suitability testing for confirmation of the selected grout for a specific project in accordance with ISO 14824-2;(3) inspection during the production of grout on a specific project in accordance with ISO 14824-2.The test methods for each of the regimes are given in this part of ISO 14824. Some test

16、s given herein are alternatives and it will be necessary to relate the chosen test method to the specified requirements. The tests are reference tests for checking suitability of grout for use with any type of tensile steel element.Where the suitability of high viscosity grouts has been proven by fu

17、ll scale trials, alternative appropriate test methods can be adopted provided a correlation or safe relationship with these test methods has been established. ISO 2012 All rights reserved vBS ISO 14824-3:2012BS ISO 14824-3:2012Grout for prestressing tendons Part 3: Test methods1 ScopeThis part of IS

18、O 14824 describes the test methods for grout specified in ISO 14824-1. The test methods are applicable to grout for all types of structures, including bridges and buildings.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated refe

19、rences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 679, Cement Test methods Determination of strengthISO 14824-1, Grout for prestressing tendons Part 1: Basic requirements3 Terms and definitionsFor the

20、purposes of this document, the following terms and definitions apply.3.1grouthomogeneous mixture of cement and water, which may contain admixtures and additions4 Testing of grout4.1 General4.1.1 PersonnelThe grouts shall be tested by competent personnel experienced in the subject.4.1.2 Test conditio

21、nsTesting shall be carried out at temperatures specified in accordance with ISO 14824-1. The temperature of constituent materials should be as recommended by the manufacturer in order to attain grout of the required temperature.The grout for the tests shall be made from materials specified in ISO 14

22、824-1 and mixed in accordance with ISO 14824-1.NOTE ISO14824-2 requires suitability testing to be carried out using the same type of mixing equipment as is used for the actual site operations, hence it is preferable to also use the same type of equipment for all testing.4.1.3 Test reportsAll test re

23、ports shall include the following information as a minimum:a) reference to this part of ISO 14824;INTERNATIONAL STANDARD ISO 14824-3:2012(E) ISO 2012 All rights reserved 1BS ISO 14824-3:2012ISO 14824-3:2012(E)b) name and address of the testing laboratory;c) identification number of the test report;d

24、) name and address of the organization or person who ordered the test;e) name and address of the manufacturer or supplier of the product(s);f) name or other identification mark of the product;g) date of fabrication, and if relevant, supply of the product;h) date of manufacture of test specimens;i) d

25、ate of test;j) temperature of the fresh grout and ambient temperature;k) batching and mixing procedures used;l) specification of the grout mixer used;m) identification of test equipment used, including, where appropriate, calibration details;n) individual results for the required test;o) any inaccur

26、acies or uncertainty of test results;p) date and signature of the person responsible for the tests.4.2 Sieve test4.2.1 Principle of testThe test consists of pouring a quantity of grout through a sieve to check for the absence of lumps on the sieve.The test may be omitted where all grout used in the

27、project automatically passes through a sieve with an aperture 2 mm within the supply equipment.4.2.2 ApparatusA 150 mm diameter sieve with an aperture 2 mm.4.2.3 ProcedurePour a minimum of 1 l of freshly mixed grout through the sieve.NOTE This can be carried out while filling the fluidity test cone.

28、4.2.4 ReportingReport the absence of lumps on the sieve.4.3 Fluidity testTwo test methods are described. Only one is to be performed as appropriate for the type or characteristics of the grout.4.3.1 Cone method4.3.1.1 Principle of testThe fluidity of grout, expressed in seconds, is measured by the t

29、ime necessary for a stated quantity of grout (1 l) to pass through the orifice of the cone, under stated conditions.2 ISO 2012 All rights reservedBS ISO 14824-3:2012ISO 14824-3:2012(E)4.3.1.2 ApparatusThe following apparatus is required for the test:a) Cone of the dimensions given in Figure 1. The c

30、one shall be of smooth non-absorbent material. The volume of the cone (excluding the cylindrical portions at top and bottom) shall be (1,7 0,17) l.b) Stopwatch showing time to 0,1 s.c) Graduated cylinder of minimum 1 l capacity and with a diameter of approximately 60 mm.d) Thermometer.NOTE The cone

31、in Figure 1 is available in plastic.4.3.1.3 Test procedure4.3.1.3.1 PreparationMount the cone with its axis vertical and its largest diameter uppermost and support firmly in position. During the test prevent the cone from vibrating. Place the cylinder under the cone outlet. All surfaces of the cone

32、shall be clean and shall be dampened so that the surfaces are moist but without free water. Close the lower cone orifice.4.3.1.3.2 ProcedurePour the grout to fill the conical section of the cone. The grout shall be poured sufficiently slowly to prevent a build-up of air. Open the lower cone orifice

33、and at the same time start the stopwatch. Measure the time taken to the nearest 0,5 s, for 1 l of grout to run into the cylinder. The grout shall be kept agitated while waiting further testing if required.4.3.1.4 Reporting of resultsReport the time measured. ISO 2012 All rights reserved 3BS ISO 1482

34、4-3:2012ISO 14824-3:2012(E)Dimensions in millimetresDimensions are internalFigure 1 Cone for fluidity test4.3.2 Grout spread method4.3.2.1 Principle of testThe grout spread test measures the fluidity of thixotropic grouts. The fluidity is measured by the diameter of the circle of grout spread on a s

35、mooth plate after a fixed period.4.3.2.2 ApparatusThe following apparatus is required for the test:a) Glass or polished steel plate with a minimum diameter of 300 mm.b) Stiff mould made of steel or plastic with an internal diameter of 39 mm and a height of 60 mm.c) Stopwatch showing time to 0,1 s.d)

36、 Thermometer.e) Ruler with a minimum length of 300 mm and a 1 mm graduation.4.3.2.3 Test procedure4.3.2.3.1 PreparationThe spread test is carried out on the horizontal plate. Ensure that the surfaces of the mould and plate are clean and slightly moistened. If necessary apply a thin film of petroleum

37、 jelly (e.g. Vaseline1) to the brim of the mould in contact with the plate to prevent the mould from leaking during filling with grout.1) Vaseline is an example of a suitable product available commercially. This information is given for the convenience of users of this document and does not constitu

38、te an endorsement by ISO of this product.4 ISO 2012 All rights reservedBS ISO 14824-3:2012ISO 14824-3:2012(E)4.3.2.3.2 ProcedurePut the mould on the plate and prevent it from sliding. Pour the grout slowly into the mould until the level of the grout has reached the upper brim. The mould is steadily

39、lifted from the plate and kept above the spread for a maximum of 30 s before it is taken away. The spread is measured in two perpendicular directions at 30 s after the start of lifting the mould.4.3.2.4 Reporting of resultsReport the spread diameter as the average measured in the two perpendicular d

40、irections across the grout spread in millimetres.Dimensions in millimetresKey1 cylinder (steel or plastic tube)2 smooth plateFigure 2 Grout spread test4.4 Inclined tube test4.4.1 Principle of testThis test serves to determine the bleed properties and volume stability of grout at full scale and inclu

41、des the filtering effect of strands. The test consists of measuring the quantity of water and air remaining on the surface of the grout which has been allowed to stand protected from evaporation.NOTE In a first test phase, the bleed water and air accumulated on top of a tube filled with grout is det

42、ermined. The grout is injected and is allowed to set so that water losses due to evaporation are prevented. In a second phase, the effect of re-grouting of a tube on bleed water and air accumulated can be determined.4.4.2 Test equipment and set-upa) Two transparent tubes, of approximately 80 mm diam

43、eter and 5 m long, equipped with caps at each end, including grout inlet at the lower end and grout vent at the top. The tubes and caps shall be able to sustain the proposed grout pressure.b) Twelve prestressing strands 15-16 mm per tube, i.e. a total of 24, length (approximately 5 m) to just fit be

44、tween the caps on the tubes.c) Thermometer. ISO 2012 All rights reserved 5BS ISO 14824-3:2012ISO 14824-3:2012(E)4.4.3 Test procedure4.4.3.1 GeneralThe two tubes are fixed on their supports to avoid noticeable deflections, at an inclination of (30 2) against a horizontal reference line. Twelve strand

45、s shall be installed in each tube. The caps are subsequently sealed on the tube ends (see Figure 3). The cap shall allow internal inspection for presence of any air or water.The grout is prepared in accordance with the grouting method statement. Specimens shall be taken from the grout mix to measure

46、 its fluidity.4.4.3.2 Grouting of first tube (Tube 1)Grout is injected into Tube 1 from the bottom end. When the grout exits from the vent at the top with the same consistency as it enters at the bottom, the valve shall be closed. Subsequently, the grout inlet is closed, and grouting of Tube 1 is co

47、mplete.The level of air, water, and any other resulting liquid on top of the grout shall be measured (see details in Figure 3). A minimum of four measurements of levels shall be made between 0 h and 24 h after completing grouting, with one measurement just before the re-grouting of Tube 2 is started

48、 (see 4.4.3.3).NOTE 1 Liquid on top of the grout can be distinguished from the grout by its whitish to yellowish colour, usually clearer than the grout.NOTE 2 The following four measuring intervals are suggested: 30 min, 1 h, 3 h and 24 h after grouting.4.4.3.3 Grouting of second tube (Tube 2)Grout

49、Tube 2 simultaneously with Tube 1 using the same procedure and mix. At a time specified in the method statement for re-grouting, or 30 min, if not stated, the valves of inlet and vent of Tube 2 are opened, the grout pump is started again, and the flow time of the grout is measured again.This will allow any liquid accumulated on top to be replaced by grout. When grout exits from the vent on top, the valve is closed. Subsequently, the valve at the bottom is closed, and re-grouting of Tube 2 is complete.NOTE 1 Similar to