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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12350-3:2000 Incorp
2、orating Corrigenda Nos. 1 and 2 The European Standard EN 12350-3:1999 has the status of a British Standard ICS 91.100.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Testing fresh concrete Part 3: Vebe test This British Standard, having been prepared under the direction of
3、the Sector Committee for Building and Civil Engineering, was published under the authority of the Standards Committee and comes into effect on 15 January 2000 BSI 09-2000 ISBN 0 580 35297 8 BS EN 12350-3:2000 Amendments issued since publication Amd. No.DateComments 10878 Corrigendum No. 1 March 2000
4、Indicated by a sideline 11079 Corrigendum No. 2 September 2000 National foreword supersession details updated National foreword This British Standard is the English language version of EN 12350-3:1999. It will supersede BS 1881-104:1983 which will be withdrawn in 2003 when the full package of concre
5、te standards is available. The UK participation in its preparation was entrusted by Technical Committee B/517, Concrete, to Subcommittee B/517/1, Concrete production and testing, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any
6、enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references
7、The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. A Br
8、itish Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a fr
9、ont cover, an inside front cover, the EN title page, pages 2 to 5 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central
10、 Secretariat: rue de Stassart 36, B-1050 Brussels 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12350-3:1999 E EUROPEAN STANDARDEN 12350-3 NORME EUROPE ENNE EUROPA ISCHE NORM October 1999 ICS 91.100.30 English version Testin
11、g fresh concrete Part 3: Vebe test Essai pour be ton frais Partie 3: Essai Ve be Pru fung von Frischbeton Teil 3: Vebe-Pru fung This European Standard was approved by CEN on 5 September 1999. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
12、 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 Central Secretariat or to any CEN member. This European Standard exists in three official
13、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 Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgi
14、um, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Page 2 EN 12350-3:1999 BSI 03-2000 | | | Foreword This European Standard has been prepared by Technical Committee CEN/TC 1
15、04, Concrete (performance, production, placing and compliance criteria), 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 April 2000, and conflicting nation
16、al standards shall be withdrawn at the latest by December 2003. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greec
17、e, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. This standard is one of a series concerned with testing concrete. It is based on the International Standard ISO 4110: Fresh concrete Determination of the consistency Vebe test. A
18、 draft for this standard was published in 1996 for CEN enquiry as prEN 12350. It was one of a series of individually numbered test methods for fresh or hardened concrete. For convenience it has now been decided to combine these separate draft standards into three new standards with separate parts fo
19、r each method, as follows. Testing fresh concrete (EN 12350:1999). Testing hardened concrete (prEN 12390:1999). Testing concrete in structures (prEN 12504:1999). This series EN 12350 includes the following parts where the brackets give the numbers under which particular test methods were published f
20、or CEN enquiry: EN 12350 Testing fresh concrete Part 1: Sampling (former prEN 12378:1996); Part 2: Slump test (former prEN 12382:1996); Part 3: Vebe test (former prEN 12350:1996); Part 4: Degree of compactability (former prEN 12357:1996); Part 5: Flow table test (former prEN 12358:1996); Part 6: Den
21、sity (former prEN 12383:1996); Part 7: Air content Pressure methods (former prEN 12395:1996). 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
22、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. Contents Page Foreword2 1Scope3 2Normative references3 3Principle3 4Apparatus3 5Sam
23、pling3 6Procedure4 7Test result4 8Test report4 9Precision4 Page 3 EN 12350-3:1999 BSI 03-2000 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 exceeds
24、 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 This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the
25、 appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the
26、publication referred to applies. EN 12350-1:1999, 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 over the top of the concrete and carefully lowered until it comes in co
27、ntact 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 Apparatus 4.1 Vebe meter (Consistometer) 4.1.1 Container, made of meta
28、l not readily attacked by cement paste, cylindrical in shape (A), having an internal diameter of 240 mm 5 mm and a height of 200 mm 2 mm. The thickness of the wall shall be approximately 3 mm and that of the base approximately 7,5 mm. The container shall be watertight and of sufficient rigidity to r
29、etain 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 not readily attacked by cement paste and not thinner than 1,5 mm. The
30、 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 of base: 200 mm 2 mm; diameter of top: 100 mm 2 mm; height: 300 mm
31、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 facilitate lifting it from the moulded concrete test specimen in a verti
32、cal direction, as required by the test. 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 can be fixed in position by a screw (Q). The swivel arm also supports a funnel (D), the bottom of which coin
33、cides 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). When in the appropriate position, the axes of the rod and of the funnel shall be coincident with the axis
34、of the container. The transparent disc shall be 230 mm 2 mm in diameter and 10 mm 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 g 50 g. The rod shall be provided with a scale at 5 mm
35、intervals to record the slump of the concrete. 4.1.4 Vibrating table (G), 380 mm 3 mm in length and 260 mm 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
36、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 approximately0,5 mm. 4.1.5 Compacting rod, of circular cross-section, straight, made of steel, having a diameter of approximately 16 mm and length ap
37、proximately 600 mm and with rounded ends. 4.1.6 Stop watch or clock, capable of recording time to an accuracy of 0,5 s. 4.1.7 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 th
38、at the concrete can be thoroughly re-mixed, using the square-mouthed shovel. 4.1.8 Shovel, with square mouth NOTEThe square mouth is required to ensure proper mixing of material on the re-mixing tray. 4.1.9 Scoop, width approximately 100 mm. 5 Sampling The sample shall be obtained in accordance with
39、 EN 12350-1:1999. The sample shall be re-mixed using the remixing container and the square mouthed shovel before carrying out the test. Page 4 EN 12350-3:1999 BSI 03-2000 | 6 Procedure Place the Vebe meter on a rigid horizontal base, ensuring that the container (A) is firmly fixed to the vibrating t
40、able (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 bottom of the container. From the sample of concrete obtained in accord
41、ance 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 distributed over the cross-section of each layer. For the bottom layer, this w
42、ill necessitate inclining the rod slightly 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 penetra
43、te into the underlying layer. In filling 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 sc
44、rew (F) and raise the funnel (D) and swing 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 an
45、d rolling motion of the compacting rod. 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 5 s to 10 s by a steady upward lift with no lateral or torsional motion being imparted to the concrete. If
46、the concrete shears, as shown in Figure 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 obtain
47、ed, record the fact. Swing the transparent 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
48、 the screw (Q). Read and record the value 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
49、 the container to rest on the concrete. Start 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 to the nearest second. Carry out the entire operation, from the start of the filling, without interruption, and complete within 5 minutes. NOTEThe consistence of a c