DIN EN 12390-2-2009 Testing hardened concrete - Part 2 Making and curing specimens for strength tests English version of DIN EN 12390-2 2009-08《硬化混凝土试验 第2部分 强度试样的制备和养护 英文版本DIN EN 1.pdf

《DIN EN 12390-2-2009 Testing hardened concrete - Part 2 Making and curing specimens for strength tests English version of DIN EN 12390-2 2009-08《硬化混凝土试验 第2部分 强度试样的制备和养护 英文版本DIN EN 1.pdf》由会员分享，可在线阅读，更多相关《DIN EN 12390-2-2009 Testing hardened concrete - Part 2 Making and curing specimens for strength tests English version of DIN EN 12390-2 2009-08《硬化混凝土试验 第2部分 强度试样的制备和养护 英文版本DIN EN 1.pdf（10页珍藏版）》请在麦多课文档分享上搜索。

1、August 2009DEUTSCHE NORM English price group 7No 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!$YEZ“1543455ww

2、w.din.deDDIN EN 12390-2Testing hardened concrete Part 2: Making and curing specimens for strength tests; German VersionEN 12390-2:2009English version of DIN EN 12390-2:2009-08Prfung von Festbeton Teil 2: Herstellung und Lagerung von Probekrpern fr FestigkeitsprfungenEnglische Fassung DIN EN 12390-2:

3、2009-08SupersedesDIN EN 12390-2:2001-06www.beuth.deDocument comprises pages10DIN EN 12390-2:2009-08 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 preparation

4、 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 12390-2:2001-06 as follows: a) The standard has been editorially revised. b) The filling procedure of moulds

5、 has been revised. c) The compacting procedure of concrete has been revised. Previous editions DIN EN 12390-2: 2001-06 2 EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 12390-2March 2009ICS 91.100.30 Supersedes EN 12390-2:2000 English VersionTesting hardened concrete - Part 2: Making and curingspe

6、cimens for strength testsEssai pour bton durci - Partie 2 : Confection etconservation des prouvettes pour essais de rsistancePrfung von Festbeton - Teil 2: Herstellung und Lagerungvon Probekrpern fr FestigkeitsprfungenThis European Standard was approved by CEN on 20 January 2009.CEN members are boun

7、d 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 may be obtained on application to the CEN

8、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 CEN Management Centre has the same status a

9、s 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, Netherlands, Norway, Poland, Portugal,Romania, Slovak

10、ia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CE

11、N national Members.Ref. No. EN 12390-2:2009: EEN 12390-2:2009 (E) 2 Contents Page Foreword 3 1 Scope 5 2 Normative references 5 3 Apparatus .5 4 Sampling .6 5 Procedures .6 6 Report .8 DIN EN 12390-2:2009-08 EN 12390-2:2009 (E) 3 Foreword This document (EN 12390-2:2009) has been prepared by Technica

12、l 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 by endorsement, at the latest by October 2009, and conflicting national standards sh

13、all be withdrawn at the latest by October 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 12390-2:20

14、00. The results of a laboratory inter-comparison, part-funded by the EC under the Measurement and Testing Programme contract MATI-CT-94-0043, have been taken into account in the drafting of this European Standard. The compaction of specimens in the moulds using hand tamping, vibrating table, or inte

15、rnal (poker) vibrator are accepted as equivalent. However, it was found in this programme that the use of an internal vibrator to compact specimens of air entrained fresh concrete should only be done with caution, if loss of entrained air is to be avoided. Curing specimens in a closely regulated hum

16、idity chamber is recognised as being equivalent to curing in water. This standard is one of a series concerned with testing concrete. The series EN 12390 includes the following parts: EN 12390 Testing hardened concrete Part 1: Shape, dimensions and other requirements of specimens and moulds; Part 2:

17、 Making and curing specimens for strength tests; Part 3: Compressive strength of test specimens; Part 4: Compressive strength - Specification for testing machines; Part 5: Flexural strength of test specimens; Part 6: Tensile splitting strength of test specimens; Part 7: Density of hardened concrete;

18、 Part 8: Depth of penetration of water under pressure. CAUTION When cement is mixed with water, alkali is released. Take precautions to avoid dry cement entering the eyes, mouth and nose whilst mixing concrete. Prevent skin contact with wet cement or concrete by wearing suitable protective clothing.

19、 If cement or concrete enters the eye, immediately wash it out thoroughly with clean water and seek medical treatment without delay. Wash wet concrete off the skin immediately. DIN EN 12390-2:2009-08 EN 12390-2:2009 (E) 4 The following amendments have been made to the 2000-10 edition of this standar

20、d: editorial revision clarification of filling procedure of moulds clarification of compacting procedure of concrete. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bu

21、lgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DIN EN 12390-2:2009-08 EN

22、 12390-2:2009 (E) 5 1 Scope This European Standard specifies methods for making and curing test specimens for strength tests. It covers the preparation and filling of moulds, compaction of the concrete, levelling the surface, curing of test specimens and transporting test specimens. 2 Normative refe

23、rences 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 document (including any amendments) applies. EN 12350-1, Testing fresh concrete Part 1:

24、 Sampling EN 12390-1, Testing hardened concrete Part 1: Shape, dimensions and other requirements for specimens and moulds 3 Apparatus 3.1 Moulds, conforming to EN 12390-1 3.2 Filling frame (optional) NOTE Filling of the moulds may be simplified by using a filling frame fitted tightly to the mould 3.

25、3 Means of compacting the concrete (one of the following) a) Internal (poker) vibrator with a minimum frequency of 120 Hz (7 200 cycles per minute), the diameter of the internal vibrator not exceeding one-quarter of the smallest dimension of the test specimen; b) Vibrating table with a minimum frequ

26、ency of 40 Hz (2 400 cycles per minute); c) Compacting rod of circular cross-section, made of steel, having a diameter of approximately 16 mm, of length approximately 600 mm and with rounded ends; d) Compacting bar, straight, made of steel having a square cross-section of approximately 25 mm x 25 mm

27、 and length approximately 380 mm; 3.4 Scoop, with width approximately 100 mm; 3.5 Steel trowel of float; 3.6 Remixing container, a flat tray of rigid construction and made from a non-absorbent material not readily attacked by cement paste. It shall be of appropriate dimensions such that the concrete

28、 can be thoroughly re-mixed, using the square-mouthed shovel; 3.7 Shovel, with square mouth; NOTE The square mouth ensures proper mixing of material on the remixing container. DIN EN 12390-2:2009-08 EN 12390-2:2009 (E) 6 3.8 Non-reactive mould release material; 3.9 Mallet, soft faced. 4 Sampling The

29、 sample shall be taken in accordance with EN 12350-1. The sample shall be re-mixed, using the remixing container and square mouth shovel, before filling the moulds. 5 Procedures 5.1 Preparation and filling of the moulds 5.1.1 Where necessary, before filling the mould, the inner surface of the mould

30、should be covered with a thin film non-reactive release material to prevent the concrete from adhering to the mould 5.1.2 Depending on the consistence of the concrete and the method of compaction, moulds shall be filled in one or more layers to achieve full compaction. In the case of self-compacting

31、 concrete, the mould shall be filled in one operation and no mechanical compaction shall be applied during filling or after the mould is filled. 5.1.3 If a filling frame is used, the amount of concrete used to fill the mould shall be such that a layer of concrete remains in the filling frame after c

32、ompaction. The thickness of this layer shall be 10 % to 20 % of the height of the test specimen. 5.2 Compaction of the concrete 5.2.1 General The concrete shall be compacted immediately after placing in the moulds in such a way as to produce full compaction of the concrete with neither excessive seg

33、regation nor laitance. Each layer shall be compacted by using one of the methods described in 5.2.2 and 5.2.3. NOTE 1 Full compaction is achieved using mechanical vibration, when there no further appearance of large air bubbles on the surface of the concrete and the surface becomes relatively smooth

34、 with a glazed appearance, without excessive segregation. NOTE 2 Further guidance on methods of compaction for concretes having different consistencies or cast in different sizes of moulds, may be given in national annex NA. 5.2.2 Mechanical vibration 5.2.2.1 Compacting with internal vibrator Apply

35、the vibration for the minimum duration necessary to achieve full compaction of the concrete. Avoid over-vibration, which may cause loss of entrained air. NOTE 1 Care should be taken not to damage the mould. The vibrator should be vertical and not allowed to touch the bottom or sides of the mould. Th

36、e use of a filling frame is recommended. NOTE 2 Laboratory tests have shown that great care is needed if loss of entrained air is to be avoided when using an internal vibrator. DIN EN 12390-2:2009-08 EN 12390-2:2009 (E) 7 5.2.2.2 Compacting with vibrating table Apply the vibration for the minimum du

37、ration necessary to achieve full compaction of the concrete. The mould should preferably be attached to, or firmly held against the table. Avoid over-vibration, which may cause loss of entrained air. 5.2.3 Compacting by hand with compacting rod or bar Distribute the strokes of the compacting rod, or

38、 bar, in a uniform manner over the cross-section of the mould. Ensure that the compacting rod, or bar, does not forcibly strike the bottom of the mould when compacting the first layer, nor penetrate significantly any previous layer. Subject the concrete to a sufficient number of strokes per layer, t

39、ypically 25 for concretes having a consistence equivalent to slump classes S1 and S2, in order to remove pockets of entrapped air but not the entrained air. After compaction of each layer, tap the sides of the container smartly with the mallet until large bubbles of air cease to appear on the surfac

40、e and depressions left by the compacting rod or bar, are removed. 5.3 Surface levelling 5.3.1 If a filling frame is used, remove it immediately after compaction is completed. 5.3.2 Remove the excess concrete above the upper edge of the mould using the steel trowel or float and carefully level the su

41、rface. 5.4 Marking 5.4.1 The test specimens shall be marked clearly and indelibly, without damaging the specimen. 5.4.2 Records shall be kept to ensure the traceability of the specimen from sampling to testing. 5.5 Curing of test specimens 5.5.1 Leave the test specimens in the mould for at least 16

42、hours, but not longer than 3 days, protected against shock, vibration and dehydration at a temperature of (20 5) C (or (25 5) C in hot climates). 5.5.2 After removal from the mould, cure the test specimens till immediately before testing, in water at a temperature of (20 2) C, or in chamber at (20 2

43、) C and relative humidity 95 %. 5.5.3 Forms of curing differing from those in 5.5.2 may be factorized to the methods described in 5.5.2. NOTE 1 In case of dispute, curing in water shall be the reference method. NOTE 2 Maintenance and measurement of high humidity 95 % at (20 2) C is not simple. Regul

44、ar checks should be made that surfaces of specimens in the chamber are continuously wet. 5.6 Transport of test specimens Avoid loss of moisture and deviations from the required temperature at all stages of transport, by, for example, packing the hardened test specimens in wet sand or wet sawdust or

45、wet cloths, or sealed in plastic bags containing water. DIN EN 12390-2:2009-08 EN 12390-2:2009 (E) 8 6 Report The report shall include: a) identification of the test sample; b) date and time of making the specimen(s); c) method of compacting the concrete in the moulds and in the case of hand compact

46、ion, the number of strokes; d) details of storage of specimens prior to de-moulding, including duration and conditions; e) method of curing specimens after de-moulding, during transportation, (if appropriate), giving temperature range and duration of curing; f) any deviation from the standard method

47、 of making and curing the specimen(s); g) declaration by the person technically responsible that the specimens were prepared in accordance with this document, except as noted in item e); The report may include: h) temperature of the re-mixed concrete; i) condition of specimen(s) on receipt, for curing (if appropriate). DIN EN 12390-2:2009-08