BS EN 12350-11-2010 Testing fresh concrete nPart 11 Self-compacting concrete Sieve nsegregation test《新拌混凝土测试 自压实混凝土 筛分离试验》.pdf

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1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 12350-11:2010Testing fresh concretePart 11: Self-compacting concrete Sievesegregation testBS EN 12350-11:2010 BRITISH STANDARDNational forewordThis British Standard is the

2、UK implementation of EN 12350-11:2010.The UK participation in its preparation was entrusted to TechnicalCommittee B/517/1, Concrete production and testing.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all

3、 the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 69215 4ICS 91.100.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Stra

4、tegy Committee on 31 August 2010Amendments issued since publicationDate Text affectedBS EN 12350-11:2010EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12350-11 July 2010 ICS 91.100.30 English Version Testing fresh concrete - Part 11: Self-compacting concrete - Sieve segregation test Essai pour

5、 bton frais - Partie 11: Bton auto-plaant - Essai de stabilit au tamis Prfung von Frischbeton - Teil 11: Selbstverdichtender Beton - Bestimmung der Sedimentationsstabilitt im Siebversuch This European Standard was approved by CEN on 20 June 2010. CEN members are bound to comply with the CEN/CENELEC

6、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 Management Centre or to any CEN

7、 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 Management Centre has the same status as the official versions. CEN

8、members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Sp

9、ain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national

10、Members. Ref. No. EN 12350-11:2010: EBS EN 12350-11:2010EN 12350-11:2010 (E) 2 Contents Page Foreword 31 Scope 52 Normative references 53 Principle 54 Apparatus .55 Test sample 56 Procedure .57 Test result .78 Test report 79 Repeatability and reproducibility .7Bibliography 9BS EN 12350-11:2010EN 123

11、50-11:2010 (E) 3 Foreword This document (EN 12350-11:2010) has been prepared by Technical 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

12、 or by endorsement, at the latest by January 2011, and conflicting national standards shall be withdrawn at the latest by January 2011. 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 responsib

13、le for identifying any or all such patent rights. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). This standard is based on the results from the EU-project “Testin

14、g-SCC“ under the 5thFrame Programme (GRD2-2000-30024/G6RD-CT-2001-00580). Owing to its significant advantages in the improvement of construction quality and working environment, self-compacting concrete (SCC) has been widely accepted by the construction owners. The use of SCC in practical concrete c

15、onstruction is steadily increasing. Since SCC has to give satisfactory in-situ properties (perfect filling of the mould and embedment of the reinforcement, homogeneity and full compaction) without vibration, the proper methods for testing the fresh SCC are very important. These should address three

16、key properties: filling ability, passing ability and resistance to segregation. It is desirable, especially in the case of new constituents or new concrete compositions, to test the consistence of fresh SCC before casting in place. A number of test methods including this test are available for testi

17、ng fresh SCC. Most of the commonly used test methods were evaluated in the recently closed EU-project “Testing-SCC“ under the 5thFrame Programme (GRD2-2000-30024/G6RD-CT-2001-00580). According to the results from this EU project, it seems that no single test method can completely cover all the three

18、 key properties. Nevertheless any test method should at least be correlated to the practical situation and give consistent results in order to provide reliable data for judgment of concrete consistence. This standard is one of a series concerned with testing fresh concrete. EN 12350, Testing fresh c

19、oncrete, consists of 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 BS EN 12350-11:2010EN 12350-11:2010 (E) 4 Par

20、t 9: Self-compacting concrete V-funnel test Part 10: Self-compacting concrete L box test Part 11: Self-compacting concrete Sieve segregation test Part 12: Self-compacting concrete J-ring test CAUTION When cement is mixed with water, alkali is released. Take precautions to avoid dry cement entering t

21、he 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 medical treatment without delay. Wash wet concrete off the skin

22、 immediately. 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, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ic

23、eland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 12350-11:2010EN 12350-11:2010 (E) 5 1 Scope This European Standard specifies the procedure for determining the sie

24、ve segregation resistance of self-compacting concrete. NOTE This test is not applicable to concrete containing fibres or lightweight aggregate. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cit

25、ed applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12350-1, Testing fresh concrete Part 1: Sampling ISO 3310-2, Test sieves Technical requirements and testing Part 2: Test sieves of perforated metal 3 Principle The sieve segregati

26、on resistance test is used to assess the resistance of self-compacting concrete to segregation. After sampling, the fresh concrete is allowed to stand for 15 min and any separation of bleed water is noted. A defined top part of the sample is then poured onto a sieve with 5 mm square apertures. After

27、 2 min the weight of material which has passed through the sieve is recorded. The segregation ratio is then calculated as the proportion of the sample and the material passing through the sieve. 4 Apparatus 4.1 Perforated plate sieve, having 5 mm square apertures, frame diameter not less than 300 mm

28、 and a height of at least 30 mm, conforming to ISO 3310-2, complete with a receiver from which the sieve can easily be removed by lifting vertically. 4.2 Balance, having a flat platform which can accommodate the sieve receiver and having a capacity of at least 10 kg, capable of determining the mass

29、to an accuracy of 0,01 kg. 4.3 Sample container, a rigid container made from a non-absorbent material and having a minimum internal diameter of 200 mm and a capacity of at least 11 l with a 10 l point indicated on the inside of the container. 4.4 Timer, capable of measuring to 1 s. 4.5 Thermometer,

30、capable of measuring to 1 C. 5 Test sample A sample shall be obtained in accordance with EN 12350-1. 6 Procedure Take and record the temperature of the concrete to the nearest 1 C by using the thermometer. BS EN 12350-11:2010EN 12350-11:2010 (E) 6 Place (10 0,5) l of concrete in the sample container

31、 and cover to prevent evaporation (see Figure 1). Key 1 Cover 2 Concrete 3 Sample container Figure 1 Sample container and cover Allow to stand in a level position, without disturbance, for (15 0,5) min. Ensure the balance is level and free from vibration. Place the sieve receiver on the balance and

32、record its mass, mpin grams. Then place the dry sieve on the receiver and again record the mass or zero the balance. At the end of the standing period remove the cover from the sample container and record whether any bleed water has appeared on the surface of the concrete. With the sieve and receive

33、r still on the balance, and with the top of the sample container (500 50) mm above the sieve, steadily and carefully pour (4,8 0,2) kg of concrete (including any bleed water) onto the centre of the sieve (see Figure 2) in one operation. Record the actual mass of concrete mcin grams on the sieve. Dim

34、ensions in millimetres Key 1 Sieve 2 Sieve receiver 3 Sample container 4 Balance Figure 2 Measurement of segregated portion Allow the concrete to stand in the sieve for (120 5) s and then remove the sieve vertically without agitation. BS EN 12350-11:2010EN 12350-11:2010 (E) 7 Record the mass of the

35、receiver, including the material that has passed through the sieve, mpsin grams. 7 Test result The segregated portion SR is calculated from the following equation and reported to the nearest 1 %. cpps100)(mmmSR= where SR is the segregated portion in percent; mpsis the mass of sieve receiver plus pas

36、sed material, in grams; mpis the mass of the sieve receiver, in grams; mcis the initial mass of concrete placed onto the sieve, in grams. 8 Test report The test report shall include: a) identification of the test sample; b) location where the test was performed; c) date and time of test; d) temperat

37、ure of the concrete at the time of test, to the nearest 1 C; e) presence of bleed water, if any, after standing for 15 min; f) segregated portion SR, to the nearest 1 %; g) any deviation from the standard test method; h) declaration by the person technically responsible for the test that it was carr

38、ied out in accordance with this standard, except as noted in item g). The report may include: i) age of concrete at time of test (if known). 9 Repeatability and reproducibility The repeatability r and reproducibility R have been determined by a programme including eleven laboratories, 22 operators a

39、nd two replicates, and interpreted in accordance with ISO 5725-2. The resulting values for r and R are given in Table 1. BS EN 12350-11:2010EN 12350-11:2010 (E) 8 Table 1 Repeatability and reproducibility for typical values of segregated portion Segregated portion SR in percent 20 20 Repeatability r

40、 in percent 3,7 10,9 Reproducibility R in percent 3,7 10,9BS EN 12350-11:2010EN 12350-11:2010 (E) 9 Bibliography 1 ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination repeatability and reproducibility method This page deliberate

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