1、August 2009DEUTSCHE NORM English price group 8No 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!$Y(8“1540521ww
2、w.din.deDDIN EN 12350-3Testing fresh concrete Part 3: Vebe testEnglish version of DIN EN 12350-3:2009-08Prfung von Frischbeton Teil 3: Vebe-PrfungEnglische Fassung DIN EN 12350-3:2009-08SupersedesDIN EN 12350-3:2000-03www.beuth.deDocument comprises pages11DIN EN 12350-3:2009-08 National foreword Thi
3、s 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 was the Normenausschuss Bauwesen (Building and Civil Engineering Standards Committee), Technical Committee NA 005-07-05
4、AA Prfverfahren fr Beton. Amendments This standard differs from DIN EN 12350-3:2000-03 as follows: a) The standard has been editorially revised. b) The time allowed for raising the mould has been changed from between 5 s and 10 s to between 2 s and 5 s. Previous editions DIN ISO 4110: 1991-06 DIN EN
5、 12350-3: 2000-03 2 EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 12350-3March 2009ICS 91.100.30 Supersedes EN 12350-3:1999 English VersionTesting fresh concrete - Part 3: Vebe testEssais pour bton frais - Partie 3: Essai Vb Prfung von Frischbeton - Teil 3: Vebe-PrfungThis European Standard was
6、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 alteration. Up-to-date lists and bibliographical references concerning such natio
7、nalstandards 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 translationunder the responsibility of a CEN member into its own language and noti
8、fied 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, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta
9、, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, 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 exploitatio
10、n in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12350-3:2009: EEN 12350-3:2009 (E) 2 Contents Page Foreword 31 Scope 52 Normative references 53 Principle 54 Apparatus .55 Sampling .66 Procedure .67 Test result .78 Test report 79 Precision .8DIN EN 12350-3:2009-0
11、8 EN 12350-3:2009 (E) 3 Foreword This document (EN 12350-3:2009) 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 identica
12、l 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 elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held
13、 responsible for identifying any or all such patent rights. This document supersedes EN 12350-3:1999. This standard 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 compac
14、tability; 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-funnel test (in preparation); Part 10: Self-compacting concrete - L-box test (in preparation); Part 11
15、: 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. Take precautions to avoid dry cement entering the eyes, mouth and nose whilst mixing concrete. Prevent
16、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 immediately. DIN EN 12350-3:2009-08 EN 12350-3:2009 (E)
17、 4 The following amendments 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
18、 countries are bound to 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
19、, Spain, Sweden, Switzerland and the United Kingdom. DIN EN 12350-3:2009-08 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 applicable to concrete of which the maximum size of aggregate exc
20、eeds 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 this document. For dated references, only the edition cited applie
21、s. 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 lifted clear of the concrete and a transparent disc is swung ov
22、er 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 fully in contact with the grout (the Vebe time), is measured. 4 A
23、pparatus 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 be approximately 3 mm and that of the base approximately 7,5 mm
24、. 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 4.1.4) by means of wing nuts (H). 4.1.2 Mould, made of metal no
25、t 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 frustum of a cone having the following internal dimensions: diameter
26、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 handles at approximately two-thirds of the height, to facilita
27、te lifting it from the moulded concrete test specimen in a vertical direction, as required by the test. DIN EN 12350-3:2009-08 EN 12350-3:2009 (E) 6 4.1.3 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
28、 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 when 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
29、). 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 shall 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
30、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 concrete. 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
31、 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 operate 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
32、 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 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 construct
33、ion 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 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 materi
34、al 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 12350-1. The sample shall be re-mixed using the remixing container and the square mouthed shovel before carrying out the test. NOTE Alternative sampling pro
35、cedures 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, 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 co
36、ntainer. 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 bottom 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
37、 the height of the mould when compacted. Compact each layer with 25 strokes of the compacting rod, ensuring that the strokes are uniformly distributed over the cross-section of each layer. DIN EN 12350-3:2009-08 EN 12350-3:2009 (E) 7 For the bottom layer, this will necessitate inclining the rod slig
38、htly and positioning approximately half the strokes spirally toward 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 filli
39、ng and tamping the top layer, heap the concrete above the mould 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 s
40、wing it out of the way and tighten the screw (F) in the new position. 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
41、. Remove the mould (B) from the concrete by raising it carefully 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
42、 2b), collapses, as shown in Figure 2c), or slumps to the extent 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 transpar
43、ent disc (C) over the top of the concrete, loosen the screw (Q) 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 val
44、ue of the slump from the scale (J). Loosen the screw (Q) to allow 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. S
45、tart the vibration of the table and the timer simultaneously. 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 t
46、o the nearest second. Carry out the entire operation, from the 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, there
47、fore, be carried out at a constant time interval after mixing, 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 incl
48、ude: a) identification of the test sample; b) location of performance of test; c) date of test; DIN EN 12350-3:2009-08 EN 12350-3:2009 (E) 8 d) type of slump true/collapse/shear; e) measured true slump, to nearest 10 mm (if appropriate); f) Vebe time in s; g) any deviation from standard test method;
49、 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 g). The report may include: i) temperature of the concrete sample at time of test; j) time of test. 9 Precision There is currently no precision data for this test. Dimensions in millimetres Key: A Container J Scale B Mould K Hollow base C Transparent disc L Vibrator unit D Funnel M Holder E Guide sleeve N Swivel arm F Screw
