BS EN 12350-5-2009 Testing fresh concrete - Flow table test《新拌混凝土试验 流动台试验》.pdf

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1、BS EN12350-5:2009ICS 91.100.30,NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDTesting fresh concretePart 5: Flow table testThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 31 May 2009 BSI 2009ISBN 978 0 580 5

2、8792 4Amendments/corrigenda issued since publicationDate CommentsBS EN 12350-5:2009National forewordThis British Standard is the UK implementation of EN 12350-5:2009. It supersedes BSEN 12350-5:2000 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/517/

3、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 British Stan

4、dard cannot confer immunityfrom legal obligations.BS EN 12350-5:2009EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 12350-5March 2009ICS 91.100.30 Supersedes EN 12350-5:1999 English VersionTesting fresh concrete - Part 5: Flow table testEssais pour bton frais - Partie 5: Essai dtalement latable ch

5、ocsPrfung von Frischbeton - Teil 5: AusbreitmaThis 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 any alterati

6、on. 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 by translati

7、onunder 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, Germany, Greec

8、e, 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 NORMUNGManagement Cen

9、tre: 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 12350-5:2009: EBS EN 12350-5:2009EN 12350-5:2009 (E) 2 Contents Page Foreword 3 1 Scope 5 2 Normative references 5 3 Principle 5 4 Apparatus

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

11、pean 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 that some of the

12、 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 12350-5:1999. This standard is one of a series concerned with testing concrete. This series EN 12350 includes th

13、e 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-compacting concrete - V-fu

14、nnel 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 is released. Tak

15、e 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 medical treatment w

16、ithout delay. Wash wet concrete off the skin immediately. BS EN 12350-5:2009EN 12350-5:2009 (E) 4 The following amendments have been made to the 1999-10 edition of this standard: editorial revision indication that the test is not applicable for self-compacting concrete clarification of carrying out

17、the test and the time for each cycle of lifting and dropping the mould to be between 1 s and 3 s (was not less than 2 s nor more than 5 s). According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard

18、: 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, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS

19、EN 12350-5:2009EN 12350-5:2009 (E) 5 1 Scope This European standard specifies a method for determining the flow of fresh concrete. It is not applicable to self-compacting concrete, foamed concrete or no-fines concrete, nor to concrete with maximum aggregate size exceeding 63 mm. NOTE The flow test i

20、s sensitive to changes in the consistency of concrete, which correspond to flow values between 340 mm and 600 mm. Beyond these extremes the flow table test may be unsuitable and other methods of determining the consistence should be considered. 2 Normative references The following referenced documen

21、ts 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: Sampling 3 Principle This test determi

22、nes the consistency of fresh concrete by measuring the spread of concrete on a flat plate which is subjected to jolting. 4 Apparatus 4.1 Flow table (see Figure 1) consisting of: a moving table made from a flat plate with a plane area of (700 2) mm (700 2) mm, on which concrete can be placed, hinged

23、to a rigid base onto which it can fall from a fixed height. The flow table top shall have a flat metal surface with a minimum thickness of 2 mm. The metal surface shall not be readily attacked by cement paste or be liable to rusting. The flow table top shall have a mass of (16 0,5) kg and may be det

24、achable using a pin-hinge to allow weighing. The construction of the plate shall be such as to prevent distortion of the upper surface. The table top shall be hinged to the base in such a way that no aggregate can become trapped between the hinged surfaces. The centre of the table shall be scribed w

25、ith a cross, the lines of which run parallel to the edges of the plate and with a central circle (210 1) mm in diameter. At the front corners of the plate two hard and rigid blocks shall be firmly attached to the underside. They should not deform when wet and be non-absorbent. These stops shall tran

26、sfer the load of the table top to the base without distorting the table. The base frame shall be constructed so that this load is transferred directly to the surface on which the apparatus is placed. This minimizes the tendency for the table top to bounce when allowed to fall freely. Foot rests shal

27、l be provided to assist in stabilizing the table in use. The fall height of the table top measured at the centre line of the front edge of the top plate shall be limited to (40 1) mm by means of one or more stops. For lifting the table top, a handle or lifting mechanism shall be provided to ensure t

28、hat the top is lifted without jerking and allowed to fall freely over the entire lifting height. BS EN 12350-5:2009EN 12350-5:2009 (E) 6 4.2 Mould, to form the test specimen, made of metal not readily attacked by cement paste and not thinner than 1,5 mm. The interior of the mould shall be smooth and

29、 free from projections, such as protruding rivets and shall be free from dents. The mould shall be in the form of a hollow frustum of a cone having the following internal dimensions: diameter of base: (200 2) mm; diameter of top: (130 2) mm; height: (200 2) mm. The base and the top shall be open and

30、 parallel to each other and at right angles to the axis of the cone. The mould shall be provided with two handles, on the upper portion, and fixing clamps or foot pieces on the bottom portion to hold it steady (see Figure 2). A mould which can be clamped to the base is acceptable provided the clampi

31、ng arrangement can be fully released without movement of the mould or interference with the slumping concrete. NOTE Magnets can be used to assist in positioning the mould. 4.3 Tamping bar, made of hard material, having a square section of side (40 1) mm and a length of approximately 200 mm. A furthe

32、r 120 mm to 150 mm may be turned to a circular section to form a handle to the bar (see Figure 3) 4.4 Rule or measuring tape, of minimum length 700 mm and having sub-divisions not greater than 5 mm along its entire length. 4.5 Remixing container, flat tray of rigid construction and made from a non-a

33、bsorbent material 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. 4.6 Shovel, with square mouth NOTE The square mouth is required to ensure proper mixing of concrete on the remixing contai

34、ner. 4.7 Moist cloth 4.8 Scoop, approximately 100 mm in width. 4.9 Timer or watch, capable of measuring time to 1 s. BS EN 12350-5:2009EN 12350-5:2009 (E) 7 Key 1 Metal plate 2 Travel limited to (40 1) 3 Upper stop 4 Table top 5 External hinges 6 Markings 7 Base frame 8 Lifting handle 9 Lower stop 1

35、0 Toe board Figure 1 Typical flow table BS EN 12350-5:2009EN 12350-5:2009 (E) 8 Dimensions in millimetres Figure 2 Mould Dimensions in millimetres Figure 3 Tamping bar 5 Sampling The sample of the concrete shall be obtained in accordance with EN 12350-1. The sample shall be re-mixed before carrying

36、out the test using the remixing container and the square mouthed shovel. NOTE Alternative sampling procedures may be given in national standards or provisions in the place of use of concrete. BS EN 12350-5:2009EN 12350-5:2009 (E) 9 6 Procedure Place the flow table on a flat and horizontal surface fr

37、ee from external vibration or shock. Ensure that the hinged top of the table can be lifted to the correct limit of its travel and is then free to fall to the lower stop. Support the table in such a way that when the top of the table fails to the lower stop, there is minimal tendency for the top to b

38、ounce. Clean the table and the mould and dampen immediately prior to testing, but keep free from superfluous moisture. Keep the contact blocks clean. Place the mould centrally on the table top and hold in position by standing on the two foot pieces, or by using magnets. Fill the mould with concrete

39、in two equal layers using the scoop, levelling each layer by tamping lightly ten times with the compacting bar. If necessary add more concrete to the second layer to maintain an excess above the top of the mould. Using the compacting bar, strike off the concrete level with the upper edge of the moul

40、d and clean the area of the table top of any excess concrete. After waiting 30 s from striking off the concrete, raise the mould vertically by the handles, over a period of 1 s to 3 s. Stabilize the flow table by standing on the toe board at the front of the table and slowly raise the table top till

41、 it reaches the upper stop in such a manner that the table top does not impact hard against the upper stop. Allow the table top to fall freely to the lower stop. Repeat this cycle to give a total of 15 drops, each cycle taking between 1 s and 3 s. With the rule, measure the maximum dimension of the

42、concrete spread in the two directions, d1and d2, (see Figure 4), parallel to the table edges and record the two measurements to the nearest 10 mm. Figure 4 Measurement of spread Check the concrete spread for segregation. The cement paste may segregate from the coarse aggregate to give a ring of past

43、e extending several millimetres beyond the coarse aggregate. Report whether segregation has occurred and if so that the test was therefore unsatisfactory. After 15 cycles, if spread is not stabilized, wait until stabilization before measuring and record time between the end of the cycles and measure

44、ment. This time shall be mentioned in report. NOTE The consistence of a concrete mix changes with time, due to hydration of the cement and, possibly, loss of moisture. Tests on different samples should be carried out at a constant time interval after mixing, if strictly comparable results are to be

45、obtained. BS EN 12350-5:2009EN 12350-5:2009 (E) 10 7 Test results The flow value f, is given by the formula:221ddf+= where: d1is the maximum dimension of the concrete spread, parallel to one table edge d2is the maximum dimension of the concrete spread, parallel to the other table edge The result sha

46、ll be reported to the nearest 10 mm. 8 Test report The report shall include: a) identification of the test sample; b) location of performance of test; c) date of test; d) any indication of segregation of the concrete; e) for viscous concrete as defined above, time between the end of the cycles and m

47、easurement (in seconds); f) the flow value, f, to nearest 10 mm; g) any deviation from standard test method; h) declaration by the person technically responsible for the test that it was carried out in accordance with this document, except as noted in item f). The report may include: i) temperature

48、of the concrete specimen at time of test; j) time of performance of the test. 9 Precision Precision data are given in Table 1. These apply to flow measurements made on concrete taken from the same sample and when each test result is obtained from a single flow determination. BS EN 12350-5:2009EN 123

49、50-5:2009 (E) 11 Table 1 Precision data for flow measurement Level Repeatability conditions Reproducibility conditions mm Srmm r mm SRmm R mm 555 24,6 69 32,5 91NOTE 1 The precision data were determined as part of an experiment carried out in the UK, in 1987 in which precision data were obtained for several tests then described in series BS 1881. The experiment involved 16 operators. The concretes were made using an ordinary Portland cement, Thames Valley sand, and Thames Valley 10 mm and 20 mm coarse aggregates. NOTE 2 The