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1、 ，如果你需要更多标准可以到 如果你购买的文档存在缺页、字迹模糊、乱码等情况，请大家通过论坛消息与我联系。Licensed Copy: Akin Koksal, Bechtel Ltd, 01 April 2003, Uncontrolled Copy, (c) BSILicensed Copy: Akin Koksal, Bechtel Ltd, 01 April 2003, Uncontrolled Copy, (c) BSIBRITISH STANDARD BS EN12504-2:2001Testing concrete in structures Part 2: Non-destru
2、ctive testing Determination of rebound numberThe European Standard EN 12504-2:2001 has the status of aBritish StandardICS 91.100.30NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 12504-2:2001National forewordThis British Standard is the official English language version o
3、fEN 12504-2:2001. It supersedes BS 1881-202:1986 which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee B/517, Concrete, to Subcommittee B/517/1, Concrete production and testing, which has the responsibility to:aid enquirers to understand the text;present to
4、the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed;monitor related international and European developments and promulgate them in the UK.A list of organizations represented on this subcommittee can be obtained on reques
5、t to its secretary.Cross-referencesThe British Standards which implement international or European 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 B
6、SI Standards Electronic Catalogue.A British Standard does not purport to include all the necessary 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.Licensed
7、Copy: Akin Koksal, Bechtel Ltd, 01 April 2003, Uncontrolled Copy, (c) BSIThis 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 Committee and comes into effect on15 August 2001 BSI
8、 07-2001ISBN 0 580 36911 0Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page,pages 2 to 5 and a back cover.The BSI copyright date displayed in this document indicates when the document was last issued.Amd. No.DateCommentsAmendments issued since publicatio
9、nEUROPEAN STANDARD NORME EUROPENNEEUROPISCHE NORMEN 12504-2June 2001ICS 91.100.30English versionTesting concrete in structures - Part 2: Non-destructive testing - Determination of rebound numberEssais pour bton dans les structures - Partie 2: Essais non destructifs - Dtermination de lindice de rebon
10、dissementPrfung von Beton in Bauwerken - Teil 2: ZerstrungsfreiePrfung - Bestimmung der RckprallzahlThis 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 t
11、he 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 Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German).
12、 A version in any other language made by translation under 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,
13、France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATION C O M I T EUR O P EN DE NOR M A L I S A TI ON EUR O P I S C H ES KOM I TEE F R NOR M UNG Management Centre: rue de Stassar
14、t, 36 B-1050 BrusselsLicensed Copy: Akin Koksal, Bechtel Ltd, 01 April 2003, Uncontrolled Copy, (c) BSI 2001 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members.Ref. No. EN 12504-2:2001 EPage 5EN 12504-2:2001ContentsPageLicensed Copy: Akin Koksal, B
15、echtel Ltd, 01 April 2003, Uncontrolled Copy, (c) BSIForeword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Apparatus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Test area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Test result . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Test report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 Precision . . . . . . . . . . . . . . . . . . . . . . . . .
20、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Licensed Copy: Akin Koksal, Bechtel Ltd, 01 April 2003, Uncontrolled Copy, (c) BSIForewordThis European Standard has been prepared by Technical Committee CEN/TC 104 Concrete (performance, production, placing
21、 and compliance criteria), 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 December 2001, and conflicting national standards shall be withdrawn at the lates
22、t by December 2003.This standard is one of a series of test methods for concrete.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 sta
23、ndard has been framed around the use of a Type N, spring driven steel hammer, originally designed bySchmidt.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 h
24、as now been decided to combine these separate draft standards into three new 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
25、 where the brackets give the numbers under which particular test methods were published for CEN enquiry:EN 12504 Testing concrete in structuresPart 1: Cored specimens - Taking, examining and testing in compersion (former prEN 12504: 1996) Part 2: Non-destructive testing - Determination of rebound nu
26、mber (former prEN 12398: 1996)Part 3: Determination of pull-out force (former 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 ofthe following countries are bound to imp
27、lement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.1 ScopeThis standard specifies a method for determining the rebound number
28、 of an area of hardened concrete using a spring-driven steel hammer.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 intende
29、d as an alternative for the compressive strength determina- tion of concrete (EN 12390-3), but with suitable correlation, it can provide an estimate of in situ strength.2 Normative referencesNot applicable.3 PrincipleA mass propelled by a spring strikes a plunger in contact with the surface and the
30、test result is expressed in terms of the rebound distance of the mass.4 Apparatus4.1 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
31、 measured on a linear scale attached to the frame of the instrument.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 fo
32、r which it is intended.Licensed Copy: Akin Koksal, Bechtel Ltd, 01 April 2003, Uncontrolled Copy, (c) BSI4.2 Calibration anvil, steel anvil for verification of the hammer, defined with a hardness of minimum52 HRC and a mass of (16 1) kg and a diameter of approximately 150 mm.NOTE: Verification on an
33、 anvil 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 area5.1 SelectionConcrete elements to be tested shall be at least 100 mm thick and fixed wi
34、thin 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
35、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 PreparationUsing the abrasive stone, grind heavily textured or
36、 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 Procedure6.1 Preliminary preparation6.1.1 Use the hammer in accordance with the manufacturers instruction
37、s 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 range recommende
38、d 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 OperationsHold the hammer firmly in a position that allows the plunger to impact perpendicularly to the surface being tested.Gradually increas
39、e 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.Ensure that no two
40、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) BSINOTE: It is preferable to draw a regular grid of lines 25 mm to 50 mm apart and take the inter- sections of the lines as the test points.Examine
41、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 checkingAfter tests, take readings using the steel anvil, record them and compare them with those taken prior to the test (see 6.1.3). If the res
42、ults differ, clean and/or adjust the hammer and repeat the test.7 Test resultThe result 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 and expressed as a whole number.If more
43、 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 concrete surfaces, to determine the variation in the results obtained.8 Test re
44、portThe 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 concrete and its condition;f) date/time of performance of the test;g) test result (median v
45、alue) 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 responsible for the test that it was carried out in accordance with this standard, except as not
46、ed in item i).NOTE: The report can include individual rebound hammer readings, if required.9 PrecisionThere are no precision data available for this test.Licensed Copy: Akin Koksal, Bechtel Ltd, 01 April 2003, Uncontrolled Copy, (c) BSIBS EN12504-2:2001BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards Inst