ISO 1920-10-2010 Testing of concrete - Part 10 Determination of static modulus of elasticity in compression《混凝土试验 第10部分 压缩时静态弹性模数的测定》.pdf

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1、 Reference number ISO 1920-10:2010(E) ISO 2010INTERNATIONAL STANDARD ISO 1920-10 First edition 2010-09-15 Testing of concrete Part 10: Determination of static modulus of elasticity in compression Essais du bton Partie 10: Dtermination du module dlasticit statique en compressionISO 1920-10:2010(E) PD

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4、e to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGH

5、T PROTECTED DOCUMENT ISO 2010 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced 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

6、ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2010 All rights reservedISO 1920-10:2010(E) ISO 2010 All rights reserved iiiCo

7、ntents Page Foreword iv 1 Scope1 2 Normative references1 3 Terms and definitions .1 4 Principle2 5 Apparatus.2 5.1 Testing machine 2 5.2 Strain measuring apparatus.2 6 Test specimens2 6.1 General .2 6.2 Shape and dimensions of test specimens2 6.3 Preparation of test specimens .3 7 Procedure.3 7.1 De

8、termination of density 3 7.2 Determination of compressive strength .3 7.3 Determination of static modulus of elasticity.4 7.4 Calculation and expression of results 4 8 Test report5 8.1 Information to be provided by the producer of the test specimens for inclusion in the test report 5 8.2 Information

9、 to be provided by the test laboratory for inclusion in the test report.5 Annex A (informative) Automatic measuring method with monotonic loading for static modulus of elasticity .7 ISO 1920-10:2010(E) iv ISO 2010 All rights reservedForeword ISO (the International Organization for Standardization) i

10、s 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 which a technical committee has been established has the right to be represe

11、nted 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 all matters of electrotechnical standardization. International Standards are d

12、rafted 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 circulated to the member bodies for voting. Publication as an International

13、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 responsible for identifying any or all such patent rights. ISO 1920-10 was prep

14、ared by Technical Committee ISO/TC 71, Concrete, reinforced concrete and pre- stressed concrete, Subcommittee SC 1, Test methods for concrete. This first edition cancels and replaces ISO 6784:1982 which has been technically revised. ISO 1920 consists of the following parts, under the general title T

15、esting of concrete: Part 1: Sampling of fresh concrete Part 2: Properties of fresh concrete Part 3: Making and curing test specimens Part 4: Strength of hardened concrete Part 5: Properties of hardened concrete other than strength Part 6: Sampling, preparing and testing of concrete cores Part 7: Non

16、-destructive tests of hardened concrete Part 8: Determination of drying shrinkage of concrete for samples prepared in the field or in the laboratory Part 9: Determination of creep of concrete cylinders in compression Part 10: Determination of static modulus of elasticity in compression INTERNATIONAL

17、 STANDARD ISO 1920-10:2010(E) ISO 2010 All rights reserved 1Testing of concrete Part 10: Determination of static modulus of elasticity in compression 1 Scope This part of ISO 1920 specifies a test method for the determination of the static modulus of elasticity in compression of hardened concrete, o

18、n test specimens which are cast or taken from a structure. 2 Normative references The 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 (in

19、cluding any amendments) applies. ISO 1920-3, Testing of concrete Part 3: Making and curing test specimens ISO 1920-4, Testing of concrete Part 4: Strength of hardened concrete ISO 1920-5, Testing of concrete Part 5: Properties of hardened concrete other than strength ISO 1920-6, Testing of concrete

20、Part 6: Sampling, preparing and testing of concrete cores EN 12390-4, Testing hardened concrete Part 4: Compressive strength Specification for testing machines 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 static modulus of elasticity in co

21、mpression of hardened concrete property of concrete, that corresponds to the tangent of the stress-strain curve NOTE 1 For design purposes the modulus of elasticity is considered equivalent to the chord modulus of deformation, when the test specimen is loaded between 0,5 MPa and F c /3, as described

22、 in this part of ISO 1920. NOTE 2 The modulus of elasticity can be considered as a modulus of deformation when the material is evaluated in the elastic range. 3.2 gauge length each part of the test specimen, over which the strain or change in length is determined ISO 1920-10:2010(E) 2 ISO 2010 All r

23、ights reserved4 Principle A basic stress of 0,5 N/mm 2(MPa) is applied to a test specimen and then the stress is gradually increased until it is equal to one-third of the 2:1 cylinder strength of the concrete. The strains at the different loadings are recorded. The modulus of elasticity is calculate

24、d by dividing the difference between the basic stress and the upper stress by the difference between the corresponding strains. 5 Apparatus 5.1 Testing machine The test shall be carried out using a compression-testing machine conforming to EN 12390-4 or to a national standard valid in the place of t

25、esting. The test machine shall be in calibration at the time of test. The calibration shall be carried out at least once a year. The compression testing machine shall be capable of applying the specified load at the specified rate and maintaining it at the required level. 5.2 Strain measuring appara

26、tus Instruments for measuring the changes in length (for example mirror or dial gauge extensometers, resistance strain gauges, inductance gauges, vibrating wire-strain gauges) shall have a gauge length of not less than two-thirds of the diameter of the test specimen (2/3 d) and shall not exceed its

27、diameter size (d). It shall be attached in such a way that the gauge points are equidistant from the two ends of the specimen and at a distance not less than one-quarter of the length of the test specimen (L/4) from its ends. Measurements shall normally be taken on not less than two opposite sides o

28、f the specimen. With specimens cast in a horizontal position, the gauge lengths should be arranged on the vertical sides as cast. The measuring apparatus shall have an accuracy of 5 10 6 . Measuring gauge having a length of not less than 100 mm may have an accuracy of 10 10 6 . 6 Test specimens 6.1

29、General a) Cast specimens When using the reference method, a minimum of five moulded specimens shall be made. Three of these shall be used to determine the mean compressive strength and two to determine the modulus of elasticity. b) Specimens taken from a structure When using the alternative method,

30、 three specimens shall be used to determine both the modulus of elasticity and the compressive strength. If taking specimens could pose a risk of damaging the structure, the number of specimens may be reduced to two. For specimens taken from a structure, the compressive strength may be estimated fro

31、m other information. 6.2 Shape and dimensions of test specimens Three test specimens shall be cylinders having the length to diameter ratio L/d = 2. These specimens shall be used to determine the compressive strength of the concrete. The other two specimens, used to measure the ISO 1920-10:2010(E) I

32、SO 2010 All rights reserved 3modulus of elasticity, shall comply to the following requirements, except where provisions valid in the place of use state otherwise. a) The minimum dimension of moulded specimens shall be 100 mm and at least four times the nominal maximum size of the aggregate in the co

33、ncrete, whichever is the larger value. b) The minimum dimension of drilled or cut-outs of structure specimens shall be 100 mm and at least three times the nominal maximum size of the aggregate in the concrete, whichever is the larger value. c) The length to diameter ratio of the test specimens shall

34、 be between L/d = 2 to 4 and 2 is recommended. Moulded test specimens should preferably be cylinders 150 mm in diameter and 300 mm in height. Alternatively, other test specimens may be used, provided that the length to diameter ratio, L/d, is not less than 2 nor more than 4, where L is the length an

35、d d the diameter, or, for a square cross-section, d is the width of one face of the specimen. 6.3 Preparation of test specimens Moulded test specimens shall be prepared and cured in accordance with ISO 1920-3. The specimens shall be adjusted for testing if necessary in accordance with ISO 1920-4. Te

36、st specimens taken from a structure shall be prepared in accordance with ISO 1920-6. If other curing procedures are used, for example in the case of drilled or cut specimens, this shall be clearly stated in the test report. If adhesives are used for the fixing points they should be rapid setting and

37、 set hard. The specimen shall be removed from water for as short a time as possible to allow the surface to be dried for the application of adhesive. Specimens shall not be less than 7 d old when removed for this purpose. Specimens shall be re- immersed in water for a minimum of 12 h before testing.

38、 7 Procedure 7.1 Determination of density Determine the density of each test specimen in accordance with ISO 1920-5, if required. 7.2 Determination of compressive strength For the reference method, determine the compressive strength of the concrete on three specimens made by the same concrete mixtur

39、e and cured under the same conditions as the specimens to be used for the determination of the static modulus of elasticity. These three specimens shall be cylinders having the length to diameter ratio L/d = 2. Determine the compressive strength by the method specified in ISO 1920-4. If the alternat

40、ive method described in 7.3.2 is used, testing of separate compressive strength specimens is not required. The mean value of the compressive strength, F c , is used to determine the stress applied in the determination of static modulus of elasticity. If, exceptionally, the specimens as described abo

41、ve are not available, the compressive strength may be estimated and the basis of the estimate reported. For specimens taken from structures, the compressive strength may be estimated from the information available or by using the alternative method described in 7.3.2. ISO 1920-10:2010(E) 4 ISO 2010

42、All rights reserved7.3 Determination of static modulus of elasticity 7.3.1 Reference method Place the test specimen centrally in the machine, with the measuring instruments or fixing points attached axially. Apply the basic stress of 0,5 N/mm 2(MPa), ( b ), maintain for 60 s, then measure and record

43、 the strain gauge readings taken at each measurement line. Steadily increase the stress at a constant rate within the range 0,20 N/(mm 2 s) to 0,60 N/(mm 2 s) until the stress equals one-third of the 2:1 cylinder strength of the concrete ( a= F c /3). Maintain the stress for 60 s, then measure and r

44、ecord the strain readings taken during the succeeding 30 s at each measurement line. If the individual strains are not within a range of 20 % of their mean value at a , recentre the test specimen and repeat the test. If it is not possible to reduce the differences to within this range, do not procee

45、d with the test. When the centring is sufficiently accurate reduce the load, at the same rate as during loading, to the level of the basic stress. Carry out at least two additional preloading cycles, using the same loading and unloading rate, and maintaining the stress ( aand b ) constant for a peri

46、od of 60 s. After completion of the last preloading cycle and a waiting period of 60 s under the stress b= 0,5 N/mm 2(MPa), at the various measurement lines record the strain reading, b , taken during the succeeding 30 s. Reload the specimen to stress a , maintain it for 60 s, at the specified rate,

47、 and at the various measurement lines measure and record the strain reading a , taken within 30 s. When all elasticity measurements have been completed, increase the load on the test specimen, at the specified rate, until failure of the specimen occurs. If the compressive strength of the specimen di

48、ffers from F cby more than 20 %, this shall be noted in the test report and it shall be reported that the result may not be reliable. 7.3.2 Alternative method Where the strain and stress on the test specimen are continuously measured during the loading cycle, the loading may be continued to the poin

49、t of obtaining the compressive strength without stopping the loading at the upper stress level. In this case, the compressive strength shall be the test value of that test specimen. The upper stress point for determining the modulus, i.e. the point of one-third of the stress corresponding to the compressive strength, may be determined from the test results. If this alternative procedure is followed, it shall be stated in the test report. An informative measuring procedure is detailed in