1、July 2009DEUTSCHE NORM English price group 8No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 91.100.30!$Xl“1537388www.d
2、in.deDDIN EN 12504-1Testing concrete in structures Part 1: Cored specimens Taking, examining and testing in compressionEnglish version of DIN EN 12504-1:2009-07Prfung von Beton in Bauwerken Teil 1: Bohrkernproben Herstellung, Untersuchung und Prfung der DruckfestigkeitEnglische Fassung DIN EN 12504-
3、1:2009-07SupersedesDIN EN 12504-1:2000-09www.beuth.deDocument comprises 12 pagesDIN EN 12504-1:2009-07 2 National foreword This standard has been prepared by Technical Committee CEN/TC 104 “Concrete and related products” (Secretariat: DIN, Germany). The responsible German body involved in its prepar
4、ation was the Normenausschuss Bauwesen (Building and Civil Engineering Standards Committee), Technical Committee NA 005-07-05 AA Prfverfahren fr Beton. Amendments This standard differs from DIN EN 12504-1:2000-09 as follows: a) The standard has been editorially revised. b) The compressive strength i
5、s to be expressed to the nearest 0,1 MPa (N/mm2) instead of 0,5 MPa (N/mm2). Previous editions DIN EN 12504-1: 2000-09 EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 12504-1February 2009ICS 91.100.30 Supersedes EN 12504-1:2000 English VersionTesting concrete in structures - Part 1: Cored specimen
6、s -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: Bohrkernproben -Herstellung, Untersuchung und Prfung der DruckfestigkeitThis European Standard was approved by C
7、EN 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 without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards
8、 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 made by translationunder the responsibility of a CEN member into its own language and notified to the
9、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, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherland
10、s, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2009 CEN All rights of exploitation in any f
11、orm and by any means reservedworldwide for CEN national Members.Ref. No. EN 12504-1:2009: EEN 12504-1:2009 (E) 2 Contents Page Foreword 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 re
12、sults 7 10 Test report 7 11 Precision .8 Bibliography . 10 DIN EN 12504-1:2009-07 Annex A (informative) The effect of aggregate size and core diameter on core specimen strength .9 EN 12504-1:2009 (E) 3 Foreword This document (EN 12504-1:2009) has been prepared by Technical Committee CEN/TC 104 “Conc
13、rete 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 by endorsement, at the latest by August 2009, and conflicting national standards shall be withdrawn at the lates
14、t 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 identifying any or all such patent rights. This document supersedes EN 12504-1:2000. It is recognized good prac
15、tice 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 to the results of the research programme, part funded by the EC under the Measurement and Testing Programme, cont
16、ract 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 compressive strength testing, but not the interpretation of the results. This standard is one of a series concerned
17、 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; Part 2: Non-destructive testing - Determination of rebound number; Part 3: Determination of pull-out force; Part
18、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 the nearest 0,1 MPa (N/mm) instead of 0,5 MPa (N/mm) According to the CEN/CENELEC Internal Regulations, the natio
19、nal standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, P
20、oland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DIN EN 12504-1:2009-07 EN 12504-1:2009 (E) 4 1 Scope This European Standard specifies a method for taking cores from hardened concrete, their examination, preparation for testing and determination of com
21、pressive 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 procedures for interpreting the core strength results. NOTE 3 For the assessment of in-situ compressive strength in
22、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 references, only the edition cited applies. For undated references, the latest edition of the referenced docume
23、nt (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 concrete - Part 3: Compressive strength of test specimens EN 12390-4:2000, Testing hardened concrete - Part
24、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 carefully examined, prepared by grinding or capping and tested in compression using standard procedures. 4 Appa
25、ratus 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, conforming to EN 12390-4 and related to the size of specimens and their expected failure load NOTE Concrete compre
26、ssion testing machines conforming to EN 12390-4 may need to be adapted to test cores. (see the Foreword of EN 12390-4:2000). DIN EN 12504-1:2009-07 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 an
27、d/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 the requirements of 7.3.a) 4.6 Squares and gauges (or other means), capable of establishing that the
28、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 the core has a significant influence on the measured strength when it approaches values greater than a
29、bout 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 information on the effect of aggregate size and core diameter on the strength of core specimens. 5.2 Location Co
30、nsider 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 is little or no reinforcement. 5.3 Drilling Unless otherwise specified, drill the cores perpendicular t
31、o 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 into account: a) the diameter of the core; b) the possible method of adjustment; c) whether compariso
32、n 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 the element from which it has been drilled. If a core is subsequently cut to produce a number of specim
33、ens, mark each specimen to indicate its position and orientation within the original core. DIN EN 12504-1:2009-07 EN 12504-1:2009 (E) 6 5.6 Reinforcement Drilling through reinforcement shall be avoided wherever possible. Ensure that cores for determination of compressive strength do not contain any
34、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 a visual examination of the cored specimen to identify any abnormalities. If required, an estima
35、tion 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 diameter dm shall be measured to within 1 %, from pairs of measurements taken at right angles, at the h
36、alf 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 accordance with Clause 7. c) reinforcement, the diameter size of any reinforcement shall be measured and t
37、he 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 determine the density of the core, this shall be determined in accordance with the procedures give
38、n 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 Annex A of EN 12390-3:2009. 7.2 Length diameter/ratios The preferred length diameter/ratios are: a) 2
39、,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: DIN EN 12504-1:2009-07 EN 12504-1:2009 (E) 7 a) for flatness, the tolerance for the end surfaces
40、 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 EN 12390-1. c) for straightness, the tolerance on the generating line of the core shall be 3
41、% 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 proportion to the actual specimen diameter to l00 mm. 8 Compression test 8.1 Storage Record
42、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 accordance with EN 12390-3 using a compression testing machine conforming to EN 12390-4. (see th
43、e 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 any surface water. Record the surface moisture condition (wet/dry) of the specimen at the time
44、 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 the nearest 0,1 MPa ( N/mm). 10 Test report The report shall include: a) description and iden
45、tification 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, position(s) in mm; f) method used for the preparation of specimen(cutting, grinding, or capping
46、); DIN EN 12504-1:2009-07 EN 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 of test; k) core compressive strength, to nearest 0,1 MPa (N/mm); l) any deviations fro
47、m 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 detailed in item l). The report may include: n) mass of the specimen, in kg; o) apparent densi
48、ty 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 information e.g. voidage. 11 Precision No estimate of repeatability or reproducibility is give
49、n with this test, but it is likely to be inferior to that for standard cast specimens. DIN EN 12504-1:2009-07 EN 12504-1:2009 (E) 9 Annex A The 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 aggreg
