1、BS EN12504-1:2009ICS 91.100.30NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDTesting concrete instructuresPart 1: Cored specimens Taking,examining and testing in compressionThis British Standard was published under the authority of the Standards Policy and Stra
2、tegy Committee on 30 September 2009 BSI 2009ISBN 978 0 580 58801 3Amendments/corrigenda issued since publicationDate CommentsBS EN 12504-1:2009National forewordThis British Standard is the UK implementation of EN 12504-1:2009. Itsupersedes BS EN 12504-1:2000 which is withdrawn.The UK participation i
3、n its preparation was entrusted to TechnicalCommittee B/517/1, Concrete production and testing.A list of organizations represented on this committee can be obtained onrequest to its secretary.Guidance on the use of BS EN 12504-1:2009 is included in National Annex NA (informative).This publication do
4、es not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunityfrom legal obligations.BS EN 12504-1:2009EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 12504-1February 2009ICS 91.100.3
5、0 Supersedes EN 12504-1:2000 English VersionTesting concrete in structures - Part 1: Cored specimens -Taking, examining and testing in compressionEssais pour bton dans les structures - Partie 1: Carottes -Prlvement, examen et essais en compressionPrfung von Beton in Bauwerken - Teil 1: Bohrkernprobe
6、n -Herstellung, Untersuchung und Prfung der DruckfestigkeitThis 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 EuropeanStandard the status of a national standard withou
7、t any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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, German). A version in any other language mad
8、e by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France,
9、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 STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNG
10、Management Centre: rue de Stassart, 36 B-1050 Brussels 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12504-1:2009: EBS EN 12504-1:2009EN 12504-1:2009 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Principl
11、e 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 strength .9 Bibliography . 10 BS EN 12504-1:2009EN 12504
12、-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 standard, either by publication of an identical text or
13、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. CEN and/or CENELEC shall not be held responsible for
14、 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 drafting the standard consideration has been given t
15、o 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 also provides procedures for visual examination and com
16、pressive 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 specimens - Taking, examining and testing in compression; P
17、art 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: editorial revision compressive strength to be expressed to t
18、he 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
19、 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 12504-1:2009EN 12504-1:2009 (E) 4 1 Scope This European Standard specifies a method f
20、or 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. NOTE 2 This European Standard does not provide procedure
21、s 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 indispensable for the application of this document. For dated refe
22、rences, 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 specimens and moulds EN 12390-3:2009, Testing hardened c
23、oncrete - 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 Principle Cores extracted using a core drill are care
24、fully 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 set out in 7.3 4.2 Compression testing machine, conform
25、ing 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 12504-1:2009EN 12504-1:2009 (E) 5 4.3 Balance or scale, capabl
26、e 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 establishing that the relevant flatness of the specimen is within
27、 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 maximum aggregate size in the concrete to the diameter of
28、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 drill cores. NOTE Informative Annex A provides informatio
29、n 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 joints or edges of the concrete element and where there i
30、s 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 length of cores to be taken for strength testing, take
31、 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 each core. Record its location and orientation within t
32、he 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 12504-1:2009EN 12504-1:2009 (E) 6 5.6 Reinforcement Drilling through reinforcement shall be avoided w
33、herever 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 position in mm. 6 Examination 6.1 Visual inspection Carry out
34、 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 Measurements Measurements shall be as follows: a) core diamet
35、er 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 length after completion of the end preparation, in accordanc
36、e 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. Measurement shall be to the nearest mm. If it is required to d
37、etermine 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 ends of cores for compression tests in accordance with Anne
38、x 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 Prepare the specimen to within the following tolerances:
39、 BS EN 12504-1:2009EN 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 prepared ends, with respect to the side, shall comply with E
40、N 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 adequacy and narrowed if necessary: for example, reduced in
41、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 before testing. 8.2 Testing Carry out the testing in acco
42、rdance 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 specimen is to be tested whilst it is still wet, remove an
43、y 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, calculated from the average diameter and express the result to t
44、he 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; e) reinforcement (when appropriate): diameter, in mm, pos
45、ition(s) in mm; f) method used for the preparation of specimen(cutting, grinding, or capping); BS EN 12504-1:2009EN 12504-1:2009 (E) 8 g) length and diameter of the core as received; h) length/diameter ratio of prepared specimen; i) surface moisture condition at time of test; j) date of performance
46、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 carried out in accordance with the standard except as detaile
47、d in item l). The report may include: n) mass of the specimen, in kg; o) apparent density of specimen, to the nearest 10 kg/m3; p) condition of the specimen on receipt; q) curing conditions since receipt; r) time of test (if appropriate); s) age of specimen at time of test; t) other relevant informa
48、tion 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 12504-1:2009EN 12504-1:2009 (E) 9 Annex A (informative) The effect of aggregate size and core diameter on core specimen
49、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 diameter cores. NOTE The above data is based on the results o
