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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12350-5:2000 Incorp
2、orating Corrigendum No.1 The European Standard EN 12350-5:1999 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 5: Flow table test This British Standard, having been prepared under the direction of t
3、he 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 35295 1 BS EN 12350-5:2000 Amendments issued since publication Amd. No.DateComments 11078 Corrigendum No.1 September 20
4、00 National foreword supersession details updated National foreword This British Standard is the English language version of EN 12350-5:1999. It will supersede BS 1881-105:1984 which will be withdrawn in 2003 when the full package of concrete standards is available. The UK participation in its prepa
5、ration 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 enquiries on the interpretation, or proposals for change, an
6、d 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 The British Standards which implement international or Europ
7、ean 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 British Standard does not purport to include all the necessary
8、 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 front cover, an inside front cover, the EN title page, pages 2
9、 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 Secretariat: rue de Stassart 36, B-1050 Brussels 1999 CEN A
10、ll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12350-5:1999 E EUROPEAN STANDARDEN 12350-5 NORME EUROPE ENNE EUROPA ISCHE NORM October 1999 ICS 91.100.30 English version Testing fresh concrete Part 5: Flow table test Essai pour be ton f
11、rais Partie 5: Essai de talement a la table a chocs Pru fung von Frischbeton Teil 5: Ausbreitma 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 giving this European Standard t
12、he 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 versions (English, French, Germa
13、n). 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, Belgium, Czech Republic, Denmark, Fin
14、land, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Page 2 EN 12350-5:1999 BSI 01-2000 Foreword This European Standard has been prepared by Technical Committee CEN/TC 104, Concrete performance, production,
15、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 national standards shall be withdrawn at the
16、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, Greece, Iceland, Ireland, Italy, Luxembourg,
17、 Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. This standard is one of a series concerned with testing fresh concrete. It is based on the proposed draft International standard ISO DP 9812: Fresh concrete Determination of the consistency Flow test. A draft for this
18、 standard was published in 1996 for CEN enquiry as prEN 12358. 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 for each methods,
19、 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 for CEN enquiry
20、: 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: Density (former
21、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 by wearing su
22、itable 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 5Sampling5 6Proce
23、dure5 7Test results5 8Test report5 9Precision5 Page 3 EN 12350-5:1999 BSI 01-2000 1 Scope This European standard specifies a method for determining the flow of fresh concrete. It is not applicable to foamed concrete or no-fines concrete, nor to concrete with maximum aggregate size exceeding 63 mm. N
24、OTEThe flow test is 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 consistency should be considered. 2 Normative references This European S
25、tandard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the 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
26、 to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 12350-1:1999, Testing fresh concrete Part 1: Sampling. 3 Principle This test determines the consistency of fresh concrete by measurin
27、g 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 (7002) mm 3 (7002) mm, on which concrete can be placed, hinged to a rigid base onto which it can fall from a fix
28、ed 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 (160,5) kg and may be attached using a pin-hinge to allow weighing. The con
29、struction 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 with a cross, the lines of which run parallel to the
30、edges of the plate and with a central circle (210l) mm in diameter. At the front corners of the plate two hard rigid blocks shall be firmly attached to the underside. They should not deform when wet and be non-absorbent. These stops shall transfer the load of the table top to the base without distor
31、ting 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 shall be provided to assist in stabilizing the table in use.
32、The fall height of the table top measured at the centre line of the front edge of the top plate shall be limited to (401) mm by means of one or more stops. For lifting the table top, a handle or lifting mechanism shall be provided to ensure that the top is lifted without jerking and allowed to fall
33、freely over the entire lifting height. 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 free from projections, such as protruding rivets and shall be free from dents. The mould shall be
34、 in the form of a hollow frustum of a cone having the following internal dimensions: diameter of base: (2002) mm; diameter of top: (1302) mm; height: (2002) mm. The base and the top shall be open and parallel to each other and at right angles to the axis of the cone. The mould shall be provided with
35、 two handles, on the upper portion, and fixing clamps or foot pieces on the bottom portion to hold it steady. A mould which can be clamped to the base is acceptable provided the clamping arrangement can be fully released without movement of the mould or interference with the slumping concrete. NOTEM
36、agnets can be used to assist in positioning the mould. 4.3 Compacting bar, made of hard material, having a square section of side (401) mm and a length of approximately 200 mm. A further 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, of min
37、imum length 700 mm and having 5 mm sub-divisions along its entire length. 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 thoroughly re-mixed, usin
38、g the square-mouthed shovel. 4.6 Shovel, with square mouth. NOTEThe square mouth is required to ensure proper mixing of concrete on the remixing container. 4.7 Moist cloth. 4.8 Scoop, approximately 100 mm in width. 4.9 Timer or watch, capable of measuring time to 1 s. Page 4 EN 12350-5:1999 BSI 01-2
39、000 Dimensions in millimetres Key 1)Metal plate6)Markings 2)Travel limited to 4017)Base frame 3)Upper stop8)Lifing handle 4)Table top9)Lower stop 5)External hinges10)Toe board Figure 1 Typical flow table Dimensions in millimetres Figure 2 Concrete mould Dimensions in millimetres Figure 3 Tamping bar
40、 Page 5 EN 12350-5:1999 BSI 01-2000 5 Sampling The sample of the concrete shall be obtained in accordance with EN 12350-1:1999. The sample shall be re-mixed before carrying out the test using the remixing container and the square mouthed shovel. 6 Procedure Place the flow table on a flat and horizon
41、tal surface free 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 fo
42、r the top to bounce. 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
43、with concrete in two equal layers using the scoop, levelling each layer by tamping lightly ten times with the tamping bar. If necessary add more concrete to the second layer to maintain an excess above the top of the mould. Using the tamping bar, strike off the concrete level with the upper edge of
44、the mould 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 3 s to 6 s. Stabilize the flow table by standing on the toe board at the front of the table and slowly raise the table
45、top till 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 15drops, each cycle taking not less than 2 s nor more than 5 s. With the rule, measure the ma
46、ximum dimension of the 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
47、 to give a ring of paste extending several millimetres beyond the coarse aggregate. Report that segregation has occurred and that the test was therefore unsatisfactory. NOTEThe consistency of a concrete mix changes with time, due to hydration of the cement and, possibly, loss of moisture. Tests on d
48、ifferent samples should be carried out at a constant time interval after mixing, if strictly comparable results are to be obtained. 7 Test results Determine the flow value (d1+ d2)/2 and record the value to the nearest 10 mm. 8 Test report The report shall include: a) identification of the test samp
49、le; b) location of performance of test; c) date of performance of the test; d) any indication of segregation of the concrete; e) the test result; f) any deviation from standard test method; g) a declaration by the person carrying out the test that it was carried out in accordance with this standard, except as noted in item f). The report may include: h) the temperature of the concrete specimen at time of test; i) the time of performance of the test. 9 Precision Precision data are given in Table 1. These apply to
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