1、December 2012 Translation by DIN-Sprachendienst.English price group 7No part of this translation 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).IC
2、S 91.100.30!$e“1929066www.din.deDDIN EN 12504-2Testing concrete in structures Part 2: Non-destructive testing Determination of rebound number;English version EN 12504-2:2012,English translation of DIN EN 12504-2:2012-12Prfung von Beton in Bauwerken Teil 2: Zerstrungsfreie Prfung Bestimmung der Rckpr
3、allzahl;Englische Fassung EN 12504-2:2012,Englische bersetzung von DIN EN 12504-2:2012-12Essais pour bton dans les structures Partie 2: Essais non destructifs Dtermination de lindice de rebondissement;Version anglaise EN 12504-2:2012,Traduction anglaise de DIN EN 12504-2:2012-12SupersedesDIN EN 1250
4、4-2:2001-12www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.1011.12 DIN EN 12504-2:2012-12 2 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee CEN/TC 104 “Concrete and re
5、lated products” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was the Normenausschuss Bauwesen (Building and Civil Engineering Standards Committee), Working Committee NA 005-07-05 AA Prfverfahren fr Beton. Amendments This standard differs from DIN EN 12504-2:20
6、01-12 as follows: a) the standard has been editorially revised; b) the procedure for carrying out the test and the required specification of the equipment to be used have been given in more detail; c) the option of using an electronic measuring device as well as the mechanical version has been speci
7、fied. Previous editions DIN EN 12504-2: 2001-12 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12504-2 September 2012 ICS 91.100.30 Supersedes EN 12504-2:2001English Version Testing concrete in structures - Part 2: Non-destructive testing -Determination of rebound number Essais pour bton dans
8、les structures - Partie 2: Essais non destructifs - Dtermination de lindice de rebondissement Prfung von Beton in Bauwerken - Teil 2: Zerstrungsfreie Prfung - Bestimmung der Rckprallzahl This European Standard was approved by CEN on 13 July 2012. CEN members are bound to comply with the CEN/CENELEC
9、Internal Regulations which stipulate the conditions for giving this European Standard the 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-CENELEC Management Centre or to
10、 any CEN member. This European Standard exists in three official versions (English, French, German). 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-CENELEC Management Centre has the same status as the officia
11、l versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, No
12、rway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in
13、 any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12504-2:2012: EEN 12504-2:2012 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Principle 44 Apparatus .44.1 Rebound hammer 44.2 Reference anvil 44.3 Abrasive stone .55 Test location .55.1 Selection .
14、55.2 Preparation .56 Procedure .56.1 Preliminary preparation 56.2 Operations 56.3 Reference checking .67 Test result .68 Test report 69 Precision .7Bibliography 8DIN EN 12504-2:2012-12 EN 12504-2:2012 (E) 3 Foreword This document (EN 12504-2:2012) has been prepared by Technical Committee CEN/TC 104
15、“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 by endorsement, at the latest by March 2013, and conflicting national standards shall be withdrawn at the l
16、atest by March 2013. 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 12504-2:2001. This document is based
17、on the International Standard ISO 1920-7, Testing of concrete Part 7: Non-destructive tests on hardened concrete, and reference has been made to ASTM C805, Standard Test Method for Rebound number of hardened concrete. This document has been framed around the use of a Type N, spring driven steel hamm
18、er, originally designed by Schmidt. This European Standard is one of a series of test methods for concrete. The series EN 12504 “Testing concrete in structures“ consists of the following parts: Part 1: Cored specimens Taking, examining and testing in compression; Part 2: Non-destructive testing Dete
19、rmination of rebound number; Part 3: Determination of pull-out force; Part 4: Determination of ultrasonic pulse velocity. The main changes with respect to the previous edition are listed below: a) editorial revision; b) clarification to the procedure for carrying out the test and indicates the requi
20、red specification of the equipment to be used; c) the option of using an electronic measuring device as well as the mechanical version. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Au
21、stria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Swe
22、den, Switzerland, Turkey and the United Kingdom. DIN EN 12504-2:2012-12 EN 12504-2:2012 (E) 4 1 Scope This European Standard specifies a method for determining the rebound number of an area of hardened concrete using a spring-driven hammer. NOTE 1 The rebound number determined by this method can be
23、used to assess the uniformity of concrete in situ, to delineate zones or areas of poor quality or deteriorated concrete in structures. NOTE 2 The test method is not intended as an alternative for the compressive strength determination of concrete (EN 12390-3), but with suitable correlation, it can p
24、rovide an estimate of in situ compressive strength. For the assessment of in-situ compressive strength see EN 13791. NOTE 3 The hammer may be used for comparative testing, referenced against a concrete with known strength or against a concrete which has been shown that it has come from a defined vol
25、ume of concrete with a population verified as conforming to a particular strength class. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. F
26、or undated references, the latest edition of the referenced document (including any amendments) applies. EN ISO 6508-1, Metallic materials Rockwell hardness test Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T) (ISO 6508-1) 3 Principle A mass propelled by a spring strikes a plunger in co
27、ntact with the surface of the structure or specimen to be tested. The test result is expressed as a number in terms of the rebound distance of the mass. A number may also be obtained in terms of the energy or velocity differential before and after impact of the mass. 4 Apparatus 4.1 Rebound hammer C
28、onsisting of a spring-loaded hammer mass which, when released, strikes a plunger in contact with the surface to be tested. The rebound distance of the hammer mass from the plunger or other rebound values shall be measured. NOTE Several types and sizes of rebound hammers are commercially available fo
29、r testing various strength classes and types of concrete. Each type and size of hammer should be used only with the strength class and type of concrete for which it is intended. 4.2 Reference anvil Steel reference anvil for verification of the hammer, with an impact area having a hardness of minimum
30、 52 HRC when tested in accordance with EN ISO 6508-1 and a mass of (16 1) kg and a diameter of approximately 150 mm. Other anvils may be used if it can be demonstrated the accuracy of the readings are not significantly affected. The manufacturers instructions and any other equipment shall be used to
31、 ensure the longitudinal axis of the plunger is perpendicular to the surface of the anvil at impact. NOTE Verification on an anvil will not guarantee that different hammers will yield the same results at other points on the rebound scale. DIN EN 12504-2:2012-12 EN 12504-2:2012 (E) 5 4.3 Abrasive sto
32、ne A medium-grain texture silicon carbide stone or equivalent material. 5 Test location 5.1 Selection Concrete elements to be tested shall be at least 100 mm thick and fixed within a structure. Smaller elements or specimens may be tested provided they are rigidly supported. Areas exhibiting honeycom
33、bing, scaling, rough texture, or high porosity should be avoided. In selecting an area to be tested, the following factors should be considered: a) the strength of the concrete; b) type of surface (e.g. formed or unformed); c) type of concrete (e.g. normal or lightweight); d) moisture condition of t
34、he surface; e) carbonation (if appropriate); f) direction of test; g) other appropriate factors. A test location should be approximately 300 mm 300 mm. 5.2 Preparation Using the abrasive stone, grind heavily textured or soft surfaces, or surfaces with loose mortar, until they are smooth and free of
35、loose material. Smooth-formed or trowelled surfaces may be tested without grinding. Remove any water present on the surface of the concrete. 6 Procedure 6.1 Preliminary preparation 6.1.1 Use the hammer in accordance with the manufacturers instructions for its operation. 6.1.2 Before a sequence of te
36、sts on a concrete surface, clean the impact surfaces of the reference anvil and plunger. Perform at least five impacts on the steel reference anvil and record the readings from the next five impacts. If the readings from the last five impacts are not within 3 of the value given by the manufacturer,
37、clean and/or adjust the hammer in accordance with the manufacturers instructions and repeat the above. 6.1.3 The hammer shall only be operated at a temperature within the range 0 C to 50 C. 6.2 Operations At the time of the test, the hammer shall meet the requirements defined in 6.1.2. Hold the hamm
38、er firmly in a position that allows the plunger to impact perpendicularly to the surface being tested. DIN EN 12504-2:2012-12 EN 12504-2:2012 (E) 6 Gradually increase the pressure on the plunger until the hammer impacts (see 6.1.1). After impact, record the rebound number based on the rebound distan
39、ce and/or energy or velocity measurements. Examine each impression made on the surface after impact and if the impact has crushed or broken through a near-to-surface void, discount the result. Take a minimum of nine valid readings to obtain a reliable estimate of the rebound number for a test locati
40、on. Record the position and orientation of the hammer for each set of readings. Ensure that no two impact points are closer than 25 mm and none are within 25 mm of an edge. NOTE It is preferable to draw a regular grid of lines 25 mm to 50 mm apart and take the intersections of the lines as the test
41、points. 6.3 Reference checking After performing the tests, take five readings using the steel reference anvil. If the readings are not within 3 of the value given by the manufacturer, clean and/or adjust the hammer according to the manufacturers instruction and repeat the test. 7 Test result The reb
42、ound number of the test location shall be taken as the median of all the readings, adjusted if necessary to take into account the orientation of the hammer in accordance with the manufacturers instructions. The rebound number shall be expressed as a whole number. If more than 20 % of all the reading
43、s differ from the median by more than 30 % the entire set of readings shall be discarded. NOTE If more than one hammer is to be used, a sufficient number of tests should be made on similar concrete surfaces with all hammers, to determine the variation in the results obtained. 8 Test report The repor
44、t shall include: a) identification of the concrete structure/element; b) identification of test location(s); c) identification of the rebound hammer and its specification if known; d) description of preparation of test location(s); e) details of concrete (if known) and its condition; f) date/time of
45、 performance of the test; g) rebound number (median of test result readings) adjusted for hammer orientation (if appropriate) for each test location; h) any deviation from the standard test method e.g. presence of water on surface (see 5.2), temperature outside acceptable range (see 6.1.3); DIN EN 1
46、2504-2:2012-12 EN 12504-2:2012 (E) 7 i) a declaration by the person technically responsible for the test that it was carried out in accordance with this document, except as noted in item h). The report may include: j) individual rebound hammer readings, if required. 9 Precision There are no precisio
47、n data available for this test. DIN EN 12504-2:2012-12 EN 12504-2:2012 (E) 8 Bibliography 1 EN 12390-3, Testing hardened concrete Part 3: Compressive strength of test specimens 2 EN 13791, Assessment of in-situ compressive strength in structures and precast concrete components DIN EN 12504-2:2012-12
