BS EN 12350-4-2009 Testing fresh concrete nPart 4 Degree of compactability《新拌混凝土试验 第4部分 压实度》.pdf

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1、BS EN12350-4:2009ICS 91.100.30,NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDTesting fresh concretePart 4: Degree of compactabilityThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 31 May 2009 BSI 2009ISBN 97

2、8 0 580 58791 7Amendments/corrigenda issued since publicationDate CommentsBS EN 12350-4:2009National forewordThis British Standard is the UK implementation of EN 12350-4:2009. It supersedes BSEN 12350-4:2000 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommitt

3、ee B/517/1, Concrete production and testing.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a Bri

4、tish Standard cannot confer immunityfrom legal obligations.BS EN 12350-4:2009EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 12350-4March 2009ICS 91.100.30 Supersedes EN 12350-4:1999 English VersionTesting fresh concrete - Part 4: Degree of compactabilityEssais pour bton frais - Partie 4 : Indice

5、de serrage Prfung von Frischbeton - Teil 4: VerdichtungsmaThis European Standard was approved by CEN on 20 January 2009.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

6、any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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

7、by translationunder the responsibility of a CEN member into its own language and notified to the 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, Ge

8、rmany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGMa

9、nagement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12350-4:2009: EBS EN 12350-4:2009EN 12350-4:2009 (E) 2 Contents Page Foreword 3 1 Scope 5 2 Normative references 5 3 Principle 5

10、4 Apparatus .5 5 Sampling .7 6 Procedure .7 7 Expression of results 7 8 Test report 8 9 Precision .8 BS EN 12350-4:2009EN 12350-4:2009 (E) 3 Foreword This document (EN 12350-4:2009) has been prepared by Technical Committee CEN/TC 104 “Concrete and related products”, the secretariat of which is held

11、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 September 2009, and conflicting national standards shall be withdrawn at the latest by September 2009. Attention is drawn to the possibility

12、 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 12350-4:1999. This standard is one of a series concerned with testing concrete. This series EN

13、12350 includes the following parts. Part 1: Sampling; Part 2: Slump-test; Part 3: Vebe test; Part 4: Degree of compactability; Part 5: Flow table test; Part 6: Density; Part 7: Air content - Pressure methods; Part 8: Self-compacting concrete - Slump-flow test (in preparation); Part 9: Self-compactin

14、g concrete - V-funnel test (in preparation); Part 10: Self-compacting concrete - L-box test (in preparation); Part 11: Self-compacting concrete - Sieve segregation test (in preparation); Part 12: Self-compacting concrete - J-ring test (in preparation). CAUTION When cement is mixed with water, alkali

15、 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. If cement or concrete enters the eye, immediately wash it out thoroughly with clean water and seek me

16、dical treatment without delay. Wash wet concrete off the skin immediately. BS EN 12350-4:2009EN 12350-4:2009 (E) 4 The following amendments have been made to the 1999-04 edition of this standard: editorial revision correcting the minimum frequency of the vibrating table from 2400 cycles per second i

17、nto 2400 cycles per minute. According to the CEN/CENELEC Internal Regulations, the national 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, Hungar

18、y, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 12350-4:2009EN 12350-4:2009 (E) 5 1 Scope This European standard specifies a method for determining the consi

19、stence of fresh concrete by determining the degree of compactability. It is not applicable to concrete of which the maximum size of aggregate exceeds 63 mm. If the degree of compactability is less than 1,04 or more than 1,46, the concrete has a consistence for which the degree of compactability test

20、 is not suitable. 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 document (including any amendments) applies. EN 12350

21、-1, Testing fresh concrete Part 1: Sampling 3 Principle Carefully place the fresh concrete in a container using a trowel, avoiding any compaction the concrete. When the container is full, the top surface is struck off level with the top of the container. The concrete is compacted by vibration and th

22、e distance from the surface of the compacted concrete to the upper edge of the container is used to determine the degree of compactability. 4 Apparatus 4.1 Container, made of metal not readily attacked by cement paste. The internal dimensions of the container shall be: base: (200 2) mm (200 2) mm; h

23、eight: (400 2) mm. The thickness of the base and walls shall be at least 1,5 mm. NOTE The bottom of the container may be perforated to facilitate emptying. A suitable plastic plate to cover the bottom has then to be placed inside the container. 4.2 Trowel, with a flat blade (see Figure 1). BS EN 123

24、50-4:2009EN 12350-4:2009 (E) 6 Dimensions in millimetres Figure 1 Trowel 4.3 Means of compacting the concrete, which shall be one of the following: internal vibrator: with a minimum frequency of approximately 120 Hz (7 200 cycles per minute). The diameter of the internal vibrator shall not exceed on

25、e-quarter of the smallest dimension of the container; vibrating table: with a minimum frequency of approximately 40 Hz (2 400 cycles per minute). The use of a vibrating table shall be the reference method. 4.4 Remixing container, flat tray of rigid construction and made from a non-absorbent material

26、 not readily attacked by cement paste. It shall be of appropriate dimensions such that the concrete can be thoroughly re-mixed, using the square-mouthed shovel. 4.5 Shovel, with square mouth. NOTE The square mouth is required to ensure proper mixing of material on the remixing container. BS EN 12350

27、-4:2009EN 12350-4:2009 (E) 7 4.6 Straight edged scraper, more than 200 mm in length 4.7 Rule, graduated from 0 mm to 300 mm, at intervals not exceeding 5 mm, the zero mark being at the extreme end of the rule. 4.8 Moist cloth. 5 Sampling The sample shall be obtained in accordance with EN 12350-1. Th

28、e sample shall be re-mixed before carrying out the test. NOTE Alternative sampling procedures may be given in national standards or provisions in the place of use of concrete. 6 Procedure Clean the container and moisten the inner surfaces using a damp cloth. Fill the container, without tamping it, b

29、y tilting the trowel sideways from each of all four upper edges of the container in turn. When the container is filled, remove all concrete above the upper edges, using the straight edged scraper with a sawing action, in such a way as to avoid any compacting effect. Compact the concrete by means of

30、a vibrating table or by the use of an internal vibrator, until no further reduction in volume is determinable. During compaction avoid loss of concrete through splashing, or leakage. NOTE 1 Great care is recommended if loss of entrained air is to be avoided when using an internal vibrator. After com

31、paction, determine the value of s (see Figure 2), i.e.: the mean value of the distance between the surface of the compacted concrete and the upper edge of the container to the nearest millimetre. Obtain this value by measuring at the middle of each side of the container. NOTE 2 The consistence of a

32、concrete mix changes with time, due to hydration of the cement and, possibly, loss of moisture. Tests on different samples should, therefore, be carded out at a constant time interval after mixing, if strictly comparable results are to be obtained. 7 Expression of results The degree of compactabilit

33、y c is given by the formula: shhc= where h is the internal height of the container, in millimetres; s is the mean value, to the nearest millimetre, of the four distances from the surface of the compacted concrete to the upper edges of the container. The result shall be reported to the nearest 0.01.

34、BS EN 12350-4:2009EN 12350-4:2009 (E) 8 8 Test report The report shall include: a) identification of the test sample; b) location of performance of test; c) date of test; d) method of compacting; e) determined degree of compactability, to two decimal places; f) any deviation from standard test metho

35、d; g) declaration by the person technically responsible for the test that it was carried out in accordance with this document, except as noted in item e). The report may include: h) temperature of the concrete sample at time of test; i) time of test. 9 Precision There is currently no precision data

36、for this test. Figure 2 Concrete in container, before and after compaction BS EN 12350-4:2009This page has been intentionally left blank BS EN12350-4:2009BSI GroupHeadquarters 389Chiswick High Road,London, W4 4AL, UKTel +44 (0)20 8996 9001Fax +44 (0)20 8996 - British Standards InstitutionBSI is the

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