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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12350-2:2000 Incorp
2、orating Corrigendum No. 1 The European Standard EN 12350-2:1999 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 2: Slump test This British Standard, having been prepared under the direction of the S
3、ector 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 35299 4 BS EN 12350-2:2000 Amendments issued since publication Amd. No.DateComments 11080 Corrigendum No.1 September 2000 N
4、ational foreword supersession details updated National foreword This British Standard is the English language version of EN 12350-2:1999. It will supersede BS 1881-102:1983 which will be withdrawn in 2003 when the full package of concrete standards is available. The UK participation in its preparati
5、on 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, and ke
6、ep 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 European
7、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 pro
8、visions 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 to
9、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 All r
10、ights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12350-2:1999 E EUROPEAN STANDARDEN 12350-2 NORME EUROPE ENNE EUROPA ISCHE NORM October 1999 ICS 91.100.30 English version Testing fresh concrete Part 2: Slump test Essais pour be ton frais Par
11、tie 2: Essais daffaissement Pru fung von Frischbeton Teil 2: Setzma 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 the status of a national stan
12、dard 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, German). A version in any other l
13、anguage 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, Finland, France, Germany, Greec
14、e, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Page 2 EN 12350-2:1999 BSI 01-2000 Foreword This European Standard has been prepared by Technical Committee CEN/TC 104, Concrete (performance, production, placing and compliance crit
15、eria), 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 latest by December 2003. Ac
16、cording 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, Netherlands, Norway, Portu
17、gal, Spain, Sweden, Switzerland and the United Kingdom. This standard is one of a series concerned with testing fresh concrete. It is based on the International Standard ISO 4109: Fresh Concrete Determination of the consistency Slump test. A draft for this standard was published in 1996 for CEN enqu
18、riy as prEN 12382. 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, as follows: Testing fresh concrete (EN 1235
19、0:1999); 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: EN 12350 Testing fresh concrete Part 1: Sa
20、mpling (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 prEN 12383:1996). Part 7: Air content Pressur
21、e 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 suitable protective clothing. If cement or conc
22、rete 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 5Test sample3 6Procedure3 7Test result4 8Test report4 9Precisi
23、on5 Page 3 EN 12350-2:1999 BSI 01-2000 1 Scope This European standard specifies a method for determining the consistency of fresh concrete by the slump test. The slump test is sensitive to changes in the consistency of concrete which correspond to slumps between 10 mm and 200 mm. Beyond these extrem
24、es the measurement of slump can be unsuitable and other methods of determining the consistency should be considered. If the slump continues to change over a period of 1 min after de-moulding, the slump test is not suitable as a measure of consistency. The test is not suitable when the maximum size o
25、f aggregate in the concrete is greater than 40 mm. 2 Normative references This European Standard 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 d
26、ated 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 publication referred to applies. EN 12350-1:1999, Testing fresh concrete Part 1:
27、 Sampling. 3 Principle The fresh concrete is compacted into a mould in the shape of a frustum of a cone. When the cone is withdrawn upwards, the distance the concrete has slumped provides a measure of the consistency of the concrete. 4 Apparatus 4.1 Mould to form the test specimen, made of metal not
28、 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
29、of base: (2002) mm; diameter of top: (1002) mm; height: (3002) 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 with two handles near the top and fixing clamps or foot pieces near the bottom to hold it steady.
30、 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. 4.2 Compacting rod, of circular cross-section, straight, made of steel, having a diameter of (161) mm and length o
31、f (6005) mm in length, and with rounded ends. 4.3 Funnel (optional), made of non-absorbent material not readily attacked by cement paste and having a collar to enable the funnel to be located on the mould specified in 4.1. 4.4 Rule, graduated from 0 mm to 300 mm, at intervals not exceeding 5 mm, the
32、 zero mark being at the extreme end of the rule. 4.5 Base plate/surface, non-absorbent, rigid, flat, plate or other surface on which to place the mould. 4.6 Remixing container, flat tray of rigid construction and made from a non-absorbent material not readily attacked by cement paste. It shall be of
33、 appropriate dimensions such that the concrete can be thoroughly re-mixed, using the square-mouthed shovel. 4.7 Shovel, with square mouth NOTEThe square mouth is required to ensure proper mixing of material on the remixing container. 4.8 Moist cloth. 4.9 Scoop, approximately 100 mm in width. 4.10 Ti
34、mer, or clock capable of measuring to 1 s. 5 Test sample The sample of the concrete shall be obtained in accordance with EN 12350-1:1999. The sample shall be re-mixed using the remixing container and the square mouthed shovel before carrying out the test. 6 Procedure Dampen the mould and base plate
35、and place the mould on the horizontal base plate/surface. During filling of the mould hold it firmly against the base plate/surface by clamping in place, or by standing on the two foot pieces. Fill the mould in three layers, each approximately one-third of the height of the mould when compacted. Com
36、pact each layer with 25 strokes of the tamping rod. Uniformly distribute the strokes over the cross-section of each layer. For the bottom layer this will necessitate inclining the rod slightly and positioning approximately half the strokes spirally toward the centre. Compact the second layer and the
37、 top layer each throughout its depth, so that the strokes just penetrate into the immediately underlying layer. In filling and compacting the top layer, heap the concrete above the mould before tamping is started. If the tamping operation of the top layer results in subsidence of the concrete below
38、the top edge of the mould, add more concrete to keep an excess above the top of the mould at all times. After the top layer has been compacted, strike off the surface of the concrete by means of a sawing and rolling motion of the compacting rod. Page 4 EN 12350-2:1999 BSI 01-2000 Remove spilled conc
39、rete from the base plate/surface. Remove the mould from the concrete by raising it carefully in a vertical direction. 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. Carry out the entire operation
40、 from the start of the filling to the removal of the mould without interruption and complete it within 150 s. Immediately after removal of the mould, measure and record the slump (h) by determining the difference between the height of the mould and that of the highest point of the slumped test speci
41、men. NOTEThe 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, if strictly comparable results are to be obtained. 7 Test result The te
42、st is only valid if it yields a true slump, this being a slump in which the concrete remains substantially intact and symmetrical as shown in Figure l(a). If the specimen shears, as shown in Figure 1(b), another sample shall be taken and the procedure repeated. If two consecutive tests show a portio
43、n of the concrete shearing off from the mass of the test specimen, the concrete lacks the necessary plasticity and cohesiveness for the slump test to be suitable. Report the true slump (h), as shown in Figure 2, to the nearest 10 mm. 8 Test report The report shall include: a) identification of the t
44、est sample; b) location of performance of test; c) date of performance of test; d) type of slump true/shear; e) measured true slump, to nearest 10 mm; 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 stan
45、dard, except as noted in item f). The report may include: h) the temperature of the concrete sample at time of test; i) time of test. a) True slumpb) Shear slump Figure 1 Forms of slump Figure 2 Slump measurement Page 5 EN 12350-2:1999 BSI 01-2000 9 Precision Precision data are given in Table 1. The
46、se apply to slump measurements made on concrete from the same sample and when each test result is obtained from a single slump determination. The values which apply when each test result is obtained as the average of duplicate determinations are given in Table 2. Table 1 Precision data for slump mea
47、surements (single determination) RangeRepeatability conditions Reproducibility conditions SrrSRR (mm)(mm)(mm)(mm)(mm) 50 to 805,8169,025 Table 2 Precision data for slump measurements (duplicate determinations) RangeRepeatability conditions Reproducibility conditions Sr rSRR (mm)(mm)(mm)(mm)(mm) 50 t
48、o 804,1118,022 NOTE 1The precision data was determined as part of an experiment in the UK in 1987 in which precision data was obtained for several of the tests then described in BS 1881. The experiment involved 16 operators. The concretes were made using an ordinary Portland cement, Thames Valley sa
49、nd, and Thames Valley 10 mm and 20 mm coarse aggregates. NOTE 2The difference between two test results from the same sample by one operator using the same apparatus within the shortest feasible time interval will exceed the repeatability value r on average not more than once in 20 cases in the normal and correct operation of the method. NOTE 3Test results on the same sample obtained within the shortest feasible time interval by two operators each using their own apparatus will differ by the reproducibility value R on av
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