BS EN 12504-1-2009 Testing concrete in nstructures nPart 1 Cored specimens — Taking nexamining and testing in compression《结构用混凝土试验 第1部分 芯样 取样 检验和压缩试验》.pdf

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1、BS EN 12504-1:2009 ICS 91.100.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Testing concrete in structures Part 1: Cored specimens Taking, examining and testing in compressionThis British Standard was published under the authority of the Standards Policy

2、and Strategy Committee on 30 September 2009 BSI 2009 ISBN 978 0 580 58801 3 Amendments/corrigenda issued since publication Date Comments BS EN 12504-1:2009 National foreword This British Standard is the UK implementation of EN 12504-1:2009. It supersedes BS EN 12504-1:2000 which is withdrawn. The UK

3、 participation in its preparation was entrusted to Technical Committee B/517/1, Concrete production and testing. A list of organizations represented on this committee can be obtained on request to its secretary. Guidance on the use of BS EN 12504-1:2009 is included in National Annex NA (informative)

4、. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations.BS EN 12504-1:2009 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12504

5、-1 February 2009 ICS 91.100.30 Supersedes EN 12504-1:2000 English Version Testing concrete in structures - Part 1: Cored specimens - Taking, examining and testing in compression Essais pour bton dans les structures - Partie 1: Carottes - Prlvement, examen et essais en compression Prfung von Beton in

6、 Bauwerken - Teil 1: Bohrkernproben - Herstellung, Untersuchung und Prfung der Druckfestigkeit This European Standard was approved by CEN on 27 December 2008. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard th

7、e status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, Germ

8、an). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech R

9、epublic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN

10、 DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12504-1:2009: EBS EN 12504-1:2009 EN 12504-1:2009 (E) 2 Contents Page Fore

11、word 3 1 Scope 4 2 Normative references 4 3 Principle 4 4 Apparatus .4 5 Taking cores .5 6 Examination 6 7 Preparation of cores 6 8 Compression test.7 9 Expression of results 7 10 Test report 7 11 Precision .8 Annex A (informative) The effect of aggregate size and core diameter on core specimen stre

12、ngth .9 Bibliography . 10 BS EN 12504-1:2009 EN 12504-1:2009 (E) 3 Foreword This document (EN 12504-1:2009) has been prepared by Technical Committee CEN/TC 104 “Concrete and related products”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national sta

13、ndard, either by publication of an identical text or by endorsement, at the latest by August 2009, and conflicting national standards shall be withdrawn at the latest by August 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.

14、 CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12504-1:2000. It is recognized good practice to include measurement of density prior to the determination of compressive strength, as a check on compaction of the concrete. In

15、 drafting the standard consideration has been given to the results of the research programme, part funded by the EC under the Measurement and Testing Programme, contract MAT1-CT94-0043. The standard includes simple guidance on the process of taking cores, but does not consider a sampling plan. It al

16、so provides procedures for visual examination and compressive strength testing, but not the interpretation of the results. This standard is one of a series concerned with testing concrete. This series EN 12504 includes the following parts: EN 12504 Testing concrete in structures Part 1: Cored specim

17、ens - Taking, examining and testing in compression; Part 2: Non-destructive testing - Determination of rebound number; Part 3: Determination of pull-out force; Part 4: Determination of ultrasonic pulse velocity. The following amendments have been made to the 2000-03 edition of this standard: editori

18、al revision compressive strength to be expressed to the nearest 0,1 MPa (N/mm) instead of 0,5 MPa (N/mm) According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cypru

19、s, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 12504-1:2009 EN 12504-1:2009 (E)

20、 4 1 Scope This European Standard specifies a method for taking cores from hardened concrete, their examination, preparation for testing and determination of compressive strength. NOTE 1 This European Standard does not give guidance on the decision to drill cores or on the locations for drilling. NO

21、TE 2 This European Standard does not provide procedures for interpreting the core strength results. NOTE 3 For the assessment of in-situ compressive strength in structures and precast concrete components EN 13791 may be used. 2 Normative references The following referenced documents are indispensabl

22、e 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 amendments) applies. EN 12390-1, Testing hardened concrete - Part 1: Shape, dimensions and other requirements for test sp

23、ecimens and moulds EN 12390-3:2009, Testing hardened concrete - Part 3: Compressive strength of test specimens EN 12390-4:2000, Testing hardened concrete - Part 4: Compressive strength - Specification for testing machines EN 12390-7, Testing hardened concrete - Part 7: Density of hardened concrete 3

24、 Principle Cores extracted using a core drill are carefully examined, prepared by grinding or capping and tested in compression using standard procedures. 4 Apparatus 4.1 Core drill, equipment capable of extracting cores from the hardened concrete to the dimensions set out in 5.4 to the tolerances s

25、et out in 7.3 4.2 Compression testing machine, conforming to EN 12390-4 and related to the size of specimens and their expected failure load NOTE Concrete compression testing machines conforming to EN 12390-4 may need to be adapted to test cores. (see the Foreword of EN 12390-4:2000). BS EN 12504-1:

26、2009 EN 12504-1:2009 (E) 5 4.3 Balance or scale, capable of determining the mass of the core, as tested, to an accuracy of 0,1 % of the mass 4.4 Callipers and/or rules, capable of measuring the dimensions of the core and the steel reinforcement to an accuracy of 1 %. 4.5 Gauge, capable of establishi

27、ng that the relevant flatness of the specimen is within the requirements of 7.3.a) 4.6 Squares and gauges (or other means), capable of establishing that the perpendicularity and straightness of specimens are within the requirements of 7.3.b) and 7.3.c) 5 Taking cores 5.1 General The ratio of the max

28、imum aggregate size in the concrete to the diameter of the core has a significant influence on the measured strength when it approaches values greater than about 1:3. It is essential that full consideration is given to the aims of the testing and the interpretation of the data, before deciding to dr

29、ill cores. NOTE Informative Annex A provides information on the effect of aggregate size and core diameter on the strength of core specimens. 5.2 Location Consider any structural implications resulting from taking a core prior to drilling. NOTE Cores should preferably be taken at points away from jo

30、ints or edges of the concrete element and where there is little or no reinforcement. 5.3 Drilling Unless otherwise specified, drill the cores perpendicular to the surface in such a manner as not to damage the cores. Keep the drill rigidly positioned during coring. 5.4 Length of cores In deciding the

31、 length of cores to be taken for strength testing, take into account: a) the diameter of the core; b) the possible method of adjustment; c) whether comparison is to be made with cube strength or cylinder strength. 5.5 Marking and identification Immediately after drilling, clearly and indelibly mark

32、each core. Record its location and orientation within the element from which it has been drilled. If a core is subsequently cut to produce a number of specimens, mark each specimen to indicate its position and orientation within the original core. BS EN 12504-1:2009 EN 12504-1:2009 (E) 6 5.6 Reinfor

33、cement Drilling through reinforcement shall be avoided wherever possible. Ensure that cores for determination of compressive strength do not contain any reinforcing bars in, or close to, the direction of the longitudinal axis. If transverse reinforcement is encountered, record its diameter and posit

34、ion in mm. 6 Examination 6.1 Visual inspection Carry out a visual examination of the cored specimen to identify any abnormalities. If required, an estimation of the cores voidage shall be made by reference to standard documentation or by comparison to a reference concrete of known voidage. 6.2 Measu

35、rements Measurements shall be as follows: a) core diameter dm shall be measured to within 1 %, from pairs of measurements taken at right angles, at the half and quarter points of the length of the core. b) core length, the maximum and minimum lengths shall be measured to 1 % as received and the leng

36、th after completion of the end preparation, in accordance with Clause 7. c) reinforcement, the diameter size of any reinforcement shall be measured and the position, measuring from the centre of the exposed bar to the end(s) and/or axis of the core, both as received and after end preparation. Measur

37、ement shall be to the nearest mm. If it is required to determine the density of the core, this shall be determined in accordance with the procedures given in EN 12390-7 prior to capping the ends of the core. NOTE All measurements should be recorded. 7 Preparation of cores 7.1 General Prepare the end

38、s of cores for compression tests in accordance with Annex A of EN 12390-3:2009. 7.2 Length diameter/ratios The preferred length diameter/ratios are: a) 2,0 if the strength result is to be compared to cylinder strength; b) 1,0 if the strength result is to be compared to cube strength. 7.3 Tolerances

39、Prepare the specimen to within the following tolerances: BS EN 12504-1:2009 EN 12504-1:2009 (E) 7 a) for flatness, the tolerance for the end surfaces prepared by grinding or capping, using high alumina cement or sulphur, shall conform to EN 12390-1. b) for perpendicularity, the tolerance for the pre

40、pared ends, with respect to the side, shall comply with EN 12390-1. c) for straightness, the tolerance on the generating line of the core shall be 3 % of the average core diameter. NOTE If other smaller diameter cores are tested then the tolerances above should be considered with regard to their ade

41、quacy and narrowed if necessary: for example, reduced in proportion to the actual specimen diameter to l00 mm. 8 Compression test 8.1 Storage Record the storage condition(s) of the specimen. If it is required to test the specimen in a saturated condition, soak in water at (20 2) C for at least 48 h

42、before testing. 8.2 Testing Carry out the testing in accordance with EN 12390-3 using a compression testing machine conforming to EN 12390-4. (see the Note to 4.2). Do not test cores with cracked, hollow, or loose caps. Remove any loose sand or other material on the surface of the specimen. If the s

43、pecimen is to be tested whilst it is still wet, remove any surface water. Record the surface moisture condition (wet/dry) of the specimen at the time of test. 9 Expression of results Determine the compressive strength of each specimen by dividing the maximum load by the cross-sectional area, calcula

44、ted from the average diameter and express the result to the nearest 0,1 MPa ( N/mm). 10 Test report The report shall include: a) description and identification of the test specimen; b) estimated maximum size of aggregate; c) date of coring; d) visual inspection, noting any abnormalities identified;

45、e) reinforcement (when appropriate): diameter, in mm, position(s) in mm; f) method used for the preparation of specimen(cutting, grinding, or capping); BS EN 12504-1:2009 EN 12504-1:2009 (E) 8 g) length and diameter of the core as received; h) length/diameter ratio of prepared specimen; i) surface m

46、oisture condition at time of test; j) date of performance of test; k) core compressive strength, to nearest 0,1 MPa (N/mm); l) any deviations from the standard method of examination or compression testing; m) a declaration by the person responsible for the examination and testing that these were car

47、ried out in accordance with the standard except as detailed in item l). The report may include: n) mass of the specimen, in kg; o) apparent density of specimen, to the nearest 10 kg/m 3 ; p) condition of the specimen on receipt; q) curing conditions since receipt; r) time of test (if appropriate); s

48、) age of specimen at time of test; t) other relevant information e.g. voidage. 11 Precision No estimate of repeatability or reproducibility is given with this test, but it is likely to be inferior to that for standard cast specimens. BS EN 12504-1:2009 EN 12504-1:2009 (E) 9 Annex A (informative) The

49、 effect of aggregate size and core diameter on core specimen strength Experiments, where cores of 25 mm, 50 mm and 100 mm diameters containing aggregates of maximum sizes 20 mm and 40 mm were tested showed that: a) for 20 mm aggregate: 100 mm diameter cores were approximately 7 % stronger than 50mm diameter cores; 50 mm diameter cores were approximately 20 % stronger than 25mm diameter cores; b) 40 mm aggregate: 100 mm diameter cores were approximately 17 % stronger than 50 mm diameter cores; 50 mm diameter cores were approximately 19 % stronger than 25 mm d