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1、Licensed Copy: Akin Koksal, Bechtel Ltd, 01 April 2003, Uncontrolled Copy, (c) BSI British Standard A single copy of this British Standard is licensed to Akin Koksal 01 April 2003 This is an uncontrolled copy. Ensure use of the most current version of this document by searching British Standards Onl
2、ine at bsonline.techindex.co.uk BRITISH STANDARD BS EN 12504-2:2001 Testing concrete in structures Part 2: Non-destructive testing Determination of rebound number The European Standard EN 12504-2:2001 has the status of a British Standard ICS 91.100.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERM
3、ITTED BY COPYRIGHT LAW Licensed Copy: Akin Koksal, Bechtel Ltd, 01 April 2003, Uncontrolled Copy, (c) BSI BS EN 12504-2:2001 This British Standard, having been prepared under the direction of the Sector Committee for Building and Civil Engineering, was published under the authority of the Standards
4、Committee and comes into effect on 15 August 2001 BSI 07-2001 ISBN 0 580 36911 0 National foreword This British Standard is the official English language version of EN 12504-2:2001. It supersedes BS 1881-202:1986 which is withdrawn. The UK participation in its preparation was entrusted by Technical
5、Committee B/517, Concrete, to Subcommittee B/517/1, Concrete production and testing, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European
6、 publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessar
7、y provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the
8、 interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 5 and a back cover. The BS
9、I copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: Akin Koksal, Bechtel Ltd, 01 April 2003, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12504-2 June 2001
10、 ICS 91.100.30 English version Testing concrete in structures - Part 2: Non-destructive testing - Determination of rebound number Essais pour bton dans les structures - Partie 2: Essais non destructifs - Dtermination de lindice de rebondissement Prfung von Beton in Bauwerken - Teil 2: Zerstrungsfrei
11、e Prfung - Bestimmung der Rckprallzahl This European Standard was approved by CEN on 17 April 2000. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-
12、to-date lists and bibliographical references concerning such national standards may be obtained on application to the 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 translation under
13、the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembou
14、rg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2001 CENAll rights of exploitation in any form and by any mean
15、s reserved worldwide for CEN national Members. Ref. No. EN 12504-2:2001 E Licensed Copy: Akin Koksal, Bechtel Ltd, 01 April 2003, Uncontrolled Copy, (c) BSI w w w . b z f x w . c o m Page 2 EN 12504-2:2001 Contents Page Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2Normative references . . . . . . . . . . . . . . . . . . . . . . .
17、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3Principle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4Apparatus . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 5Test area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 6Procedure . . . . . . . . . . . . . . . . . . . . . . . .
19、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 7Test result . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 8Test report . . . . . . . . . . . . . . . . . . .
20、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 9Precision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Licensed Copy: Akin Koksal, Bechtel Ltd,
21、 01 April 2003, Uncontrolled Copy, (c) BSI w w w . b z f x w . c o m Page 3 EN 12504-2:2001 Foreword This European Standard has been prepared by Technical Committee CEN/TC 104 “Concrete (performance, production, placing and compliance criteria)“, the secretariat of which is held by DIN. This Europea
22、n Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2001, and conflicting national standards shall be withdrawn at the latest by December 2003. This standard is one of a series of test methods for concre
23、te. It is based on the International Standard ISO (DIS) 8045 Concrete, hardened -Determination of rebound number using the rebound hammer, and reference has been made to ASTM C805 Rebound number of hardened concrete. The standard has been framed around the use of a Type N, spring driven steel hammer
24、, originally designed by Schmidt. A draft for this standard was published in 1996 for CEN enquiry as prEN 12398. It was one of a series of individually numbered test methods for fresh or hardened concrete. For convenience it has now been decided to combine these separate draft standards into three n
25、ew standards with separate parts for each method, as follows: -Testing fresh concrete (EN 12350) -Testing hardened concrete (EN 12390) -Testing concrete in structures (EN 12504) This series EN 12504 includes the following parts where the brackets give the numbers under which particular test methods
26、were published for CEN enquiry: EN 12504 Testing concrete in structures Part 1:Cored specimens - Taking, examining and testing in compersion (former prEN 12504: 1996) Part 2:Non-destructive testing - Determination of rebound number (former prEN 12398: 1996) Part 3:Determination of pull-out force (fo
27、rmer prEN 12399: 1996) Part 4:Determination of ultrasonic pulse velouty (former prEN 12396: 1998) According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmar
28、k, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. 1 Scope This standard specifies a method for determining the rebound number of an area of hardened concrete using a spring-driven steel hammer.
29、NOTE 1: The rebound number determined by this method can be 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 determina- tion of
30、 concrete (EN 12390-3), but with suitable correlation, it can provide an estimate of in situ strength. 2 Normative references Not applicable. 3 Principle A mass propelled by a spring strikes a plunger in contact with the surface and the test result is expressed in terms of the rebound distance of th
31、e mass. 4 Apparatus 4.1 Rebound hammer, consisting of a spring-loaded steel hammer which, when released, strikes a steel plunger in contact with the concrete surface. The rebound distance of the steel hammer from the steel plunger shall be measured on a linear scale attached to the frame of the inst
32、rument. NOTE: Several types and sizes of rebound hammers are commercially available for 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. Licensed Copy: Akin Koksal, Bechtel
33、Ltd, 01 April 2003, Uncontrolled Copy, (c) BSI w w w . b z f x w . c o m Page 4 EN 12504-2:2001 4.2 Calibration anvil, steel anvil for verification of the hammer, defined with a hardness of minimum 52 HRC and a mass of (16 1) kg and a diameter of approximately 150 mm. NOTE: Verification on an anvil
34、will not guarantee that different hammers will yield the same results at other points on the rebound scale. 4.3 Abrasive stone, a medium-grain texture silicon carbide stone or equivalent material. 5 Test area 5.1 Selection Concrete elements to be tested shall be at least 100 mm thick and fixed withi
35、n a structure. Smaller specimens may be tested provided they are rigidly supported. Areas exhibiting honeycombing, 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 sur
36、face; c) type of concrete; d) moisture condition of the surface; e) carbonation (if appropriate); f) movement of the concrete under test; g) direction of test; h) other appropriate factors. A test area shall be approximately 300 mm x 300 mm. 5.2 Preparation Using the abrasive stone, grind heavily te
37、xtured or soft surfaces, or surfaces with loose mortar, until they are smooth. 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 manufacturer
38、s instructions for its operation. 6.1.2 Activate it at least three times before taking any readings, to ensure that it is working correctly. 6.1.3 Before a sequence of tests on a concrete surface, take and record readings using the steel reference anvil and check to ensure that they are within the r
39、ange recommended by the manufacturer. If they are not, clean and/or adjust the hammer. 6.1.4 The hammer should be operated at a temperature within the range 10 C to 35 C. 6.2 Operations Hold the hammer firmly in a position that allows the plunger to impact perpendicularly to the surface being tested
40、. Gradually increase the pressure on the plunger until the hammer impacts see 6.1.1. After impact, record the rebound number. Use a minimum of nine readings to obtain a reliable estimate of the rebound number for a test area. Record the position and orientation of the hammer for each set of readings
41、. Ensure that no two impact points are closer than 25 mm and none are within 25 mm of an edge. Licensed Copy: Akin Koksal, Bechtel Ltd, 01 April 2003, Uncontrolled Copy, (c) BSI w w w . b z f x w . c o m Page 5 EN 12504-2:2001 NOTE: It is preferable to draw a regular grid of lines 25 mm to 50 mm apa
42、rt and take the inter- sections of the lines as the test points. 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. 6.3 Reference checking After tests, take readings using the steel anvil, record them
43、and compare them with those taken prior to the test (see 6.1.3). If the results differ, clean and/or adjust the hammer and repeat the test. 7 Test result The result shall be taken as the median of all the readings, adjusted if necessary to take into account the orientation of the hammer in accordanc
44、e with the manufacturers instructions and expressed as a whole number. If more than 20 % of all the readings differ from the median by more than 6 units 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
45、concrete surfaces, to determine the variation in the results obtained. 8 Test report The report shall include: a) identification of the concrete structure/element; b) location of test area(s); c) identification of the rebound hammer; d) description of preparation of test area(s); e) details of concr
46、ete and its condition; f) date/time of performance of the test; g) test result (median value) and hammer orientation for each test area; h) test results adjusted for hammer orientation. (if appropriate); i) any deviation from the standard test method; j) a declaration by the person technically respo
47、nsible for the test that it was carried out in accordance with this standard, except as noted in item i). NOTE: The report can include individual rebound hammer readings, if required. 9 Precision There are no precision data available for this test. Licensed Copy: Akin Koksal, Bechtel Ltd, 01 April 2
48、003, Uncontrolled Copy, (c) BSI w w w . b z f x w . c o m BS EN 12504-2:2001 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the internat
49、ional level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: 020 8996 9000. Fax