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1、BS EN 12350-3:2009 ICS 91.100.30, NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Testing fresh concrete Part 3: Vebe test Licensed CopyChinese University of Hong Kong, 13/06/2009 04:59, Uncontrolled Copy, (c) BSI This British Standard was published under the
2、authority of the Standards Policy and Strategy Committee on 31 May 2009 BSI 2009 ISBN 978 0 580 58790 0 Amendments/corrigenda issued since publication DateComments BS EN 12350-3:2009 National foreword This British Standard is the UK implementation of EN 12350-3:2009. It supersedes BS EN 12350-3:2000
3、 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee B/517/1, Concrete production and testing. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessar
4、y provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Licensed CopyChinese University of Hong Kong, 13/06/2009 04:59, Uncontrolled Copy, (c) BSI BS EN 12350-3:2009 EUROPEAN STANDARD NORME EUROP
5、ENNE EUROPISCHE NORM EN 12350-3 March 2009 ICS 91.100.30Supersedes EN 12350-3:1999 English Version Testing fresh concrete - Part 3: Vebe test Essais pour bton frais - Partie 3: Essai VbPrfung von Frischbeton - Teil 3: Vebe-Prfung This European Standard was approved by CEN on 20 January 2009. CEN mem
6、bers are bound to comply with the CEN/CENELEC 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 applicat
7、ion 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 translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has
8、the same status as the official 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, Port
9、ugal, Romania, Slovakia, Slovenia, Spain, 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 2009 CENAll rights of exploitation in any form and by any means
10、reserved worldwide for CEN national Members. Ref. No. EN 12350-3:2009: E Licensed CopyChinese University of Hong Kong, 13/06/2009 04:59, Uncontrolled Copy, (c) BSI BS EN 12350-3:2009 EN 12350-3:2009 (E) 2 Contents Page Foreword 3? 1?Scope 5? 2?Normative references 5? 3?Principle 5? 4?Apparatus .5? 5
11、?Sampling .6? 6?Procedure .6? 7?Test result .7? 8?Test report 7? 9?Precision .8? Licensed CopyChinese University of Hong Kong, 13/06/2009 04:59, Uncontrolled Copy, (c) BSI BS EN 12350-3:2009 EN 12350-3:2009 (E) 3 Foreword This document (EN 12350-3:2009) has been prepared by Technical Committee CEN/T
12、C 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 September 2009, and conflicting national standards shall be withdraw
13、n at the latest by September 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 12350-3:1999. This stan
14、dard is one of a series concerned with testing concrete. This series EN 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-compac
15、ting concrete - Slump-flow test (in preparation); Part 9: Self-compacting 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-rin
16、g test (in preparation). 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. If cement or concrete enters
17、the eye, immediately wash it out thoroughly with clean water and seek medical treatment without delay. Wash wet concrete off the skin immediately. Licensed CopyChinese University of Hong Kong, 13/06/2009 04:59, Uncontrolled Copy, (c) BSI BS EN 12350-3:2009 EN 12350-3:2009 (E) 4 The following amendme
18、nts have been made to the 1999-10 edition of this standard: editorial revision time allowed for raising the mould changed from between 5 s and 10 s to between 2 s and 5 s. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to
19、implement this European Standard: 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, Switzer
20、land and the United Kingdom. Licensed CopyChinese University of Hong Kong, 13/06/2009 04:59, Uncontrolled Copy, (c) BSI BS EN 12350-3:2009 EN 12350-3:2009 (E) 5 1 Scope This European Standard specifies a method for determining the consistency of fresh concrete by means of the Vebe time. It is not ap
21、plicable to concrete of which the maximum size of aggregate exceeds 63 mm. If the Vebe time is less than 5 s or more than 30 s, the concrete has a consistency for which the Vebe test is unsuitable. 2 Normative references The following referenced documents are indispensable for the application of thi
22、s 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 The fresh concrete is compacted into a slump mould. The mould is
23、lifted clear of the concrete and a transparent disc is swung over the top of the concrete and carefully lowered until it comes in contact with the concrete. The slump of the concrete is recorded. The vibrating table is started and the time taken for the lower surface of the transparent disc to be fu
24、lly in contact with the grout (the Vebe time), is measured. 4 Apparatus 4.1 Vebe meter (Consistometer) 4.1.1 Container, made of metal not readily attacked by cement paste, cylindrical in shape (A), having an internal diameter of (240 5) mm and a height of (200 2) mm. The thickness of the wall shall
25、be approximately 3 mm and that of the base approximately 7,5 mm. The container shall be watertight and of sufficient rigidity to retain its shape under rough usage. It shall be fitted with handles and brackets, the latter enabling it to be securely clamped to the top of the vibrating table (G) (see
26、4.1.4) by means of wing nuts (H). 4.1.2 Mould, 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 free from projections such as protruding rivets and shall be free from dents. The mould shall be in the form of a hollow frustu
27、m of a cone having the following internal dimensions: diameter of base: (200 2) mm; diameter of top: (100 2) mm; height: (300 2) mm. The base and the top of the mould shall be open and parallel to each other and at right angles to the axis. The mould shall be provided, on the upper portion, with two
28、 handles at approximately two-thirds of the height, to facilitate lifting it from the moulded concrete test specimen in a vertical direction, as required by the test. Licensed CopyChinese University of Hong Kong, 13/06/2009 04:59, Uncontrolled Copy, (c) BSI BS EN 12350-3:2009 EN 12350-3:2009 (E) 6 4
29、.1.3 Disc, transparent, horizontal (C), attached to a rod (J) which slides vertically through a guide sleeve (E) mounted on a swivel arm (N) and which can be fixed in position by a screw (Q). The swivel arm also supports a funnel (D), the bottom of which coincides with the top of the conical mould w
30、hen the latter is positioned concentrically in the container. The swivel arm is located by a holder (M) and can be fixed in position by a set screw (F). When in the appropriate position, the axes of the rod and of the funnel shall be coincident with the axis of the container. The transparent disc sh
31、all be (230 2) mm in diameter and (10 2) mm in thickness. A weight (P) placed directly above the disc shall be provided such that the moving assembly comprising rod, disc and weight has a mass of (2 750 50) g. The rod shall be provided with a scale at 5 mm intervals to record the slump of the concre
32、te. 4.2 Vibrating table (G), having minimum dimensions of (380 3) mm in length and (260 3) mm in width and supported on four rubber shock absorbers on a hollow base (K), which in turn rests on three rubber feet. A vibrator unit (L) is securely fixed to the bottom of the table. The vibrator shall ope
33、rate at a nominal frequency of 50 Hz to 60 Hz and the vertical amplitude of the table with the empty container on top of it shall be approximately 0,5 mm. 4.3 Compacting rod, of circular cross-section, straight, made of steel, having a diameter of approximately 16 mm and length approximately 600 mm
34、and with rounded ends. 4.4 Stopwatch or clock, capable of recording time to an accuracy of 0,5 s. 4.5 Remixing container, 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 can be t
35、horoughly re- mixed, using the square-mouthed shovel. 4.6 Shovel, with square mouth NOTE The square mouth is required to ensure proper mixing of material on the re-mixing tray. 4.7 Moist cloth. 4.8 Scoop, width approximately 100 mm. 5 Sampling The sample shall be obtained in accordance with EN 12350
36、-1. The sample shall be re-mixed using the remixing container and the square mouthed shovel 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 Place the Vebe meter on a rigid horizontal base
37、, ensuring that the container (A) is firmly fixed to the vibrating table (G) by means of the wing nuts (H). Dampen the mould (B) and place it in the container. Swing the funnel (D) into position over the mould and lower onto the mould. Tighten the screw (F) so that the mould cannot rise from the bot
38、tom of the container. From the sample of concrete obtained in accordance with Clause 5, fill the mould in three layers, each approximately one-third of the height of the mould when compacted. Compact each layer with 25 strokes of the compacting rod, ensuring that the strokes are uniformly distribute
39、d over the cross-section of each layer. Licensed CopyChinese University of Hong Kong, 13/06/2009 04:59, Uncontrolled Copy, (c) BSI BS EN 12350-3:2009 EN 12350-3:2009 (E) 7 For the bottom layer, this will necessitate inclining the rod slightly and positioning approximately half the strokes spirally t
40、oward the centre. Compact the concrete throughout its whole depth, taking care not to strike the base. Compact the second layer and the top layer throughout its depth, so that the strokes just penetrate into the underlying layer. In filling and tamping the top layer, heap the concrete above the moul
41、d before tamping is started. If necessary, add further concrete to maintain an excess above the top of the mould throughout the compacting operation. After the top layer has been tamped, loosen the screw (F) and raise the funnel (D) and swing it out of the way and tighten the screw (F) in the new po
42、sition. Ensure that the mould (B) does not rise or move prematurely and concrete is not allowed to fall into the container (A). Strike off the concrete level with the top of the mould with a sawing and rolling motion of the compacting rod. Remove the mould (B) from the concrete by raising it careful
43、ly in a vertical direction, using the handles. Perform the operation of raising the mould in 2 s to 5 s by a steady upward lift with no lateral or torsional motion being imparted to the concrete. If the concrete shears, as shown in Figure 2b), collapses, as shown in Figure 2c), or slumps to the exte
44、nt that it touches the wall of the container (A), record the fact. If the concrete has not slumped into contact with the wall of the container (A), and a slump, as shown in Figure 2a) has been obtained, record the fact. Swing the transparent disc (C) over the top of the concrete, loosen the screw (Q
45、) and lower the disc very carefully until it just comes into contact with the concrete. Provided there has been a true slump, when the disc (C) just touches the highest point of the concrete, tighten the screw (Q). Read and record the value of the slump from the scale (J). Loosen the screw (Q) to al
46、low the disc (C) to easily slide down into the container to rest fully on the concrete. If there has not been a true slump ensure that screw (Q) is loosened to allow the disc (C) to slide down into the container to rest on the concrete. Start the vibration of the table and the timer simultaneously.
47、Observe the way the concrete is remoulded through the transparent disc (C). As soon as the lower surface of the disc (C) is fully in contact with the cement grout, stop the timer and switch off the vibrating table. Record the time taken to the nearest second. Carry out the entire operation, from the
48、 start of the filling, without interruption, and complete within 5 minutes. 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, therefore, be carried out at a constant time interval after mixing,
49、 if strictly comparable results are to be obtained. 7 Test result Record the time read from the stopwatch, to the nearest second. This is the Vebe time, expressing the consistency of the mix under test. 8 Test report The report shall include: a) identification of the test sample; b) location of performance of test; c) date of test; Licensed CopyChinese University of Hong Kong, 13/06/2009 04:59, Uncontrolled Copy, (c) BSI BS EN 12350-3:2009 EN 12350-3:2009 (E) 8 d) type of slump true/collapse/shear; e) measured true slump, to ne