1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 12350-10:2010Testing fresh concretePart 10: Self-compacting concrete L boxtestBS EN 12350-10:2010 BRITISH STANDARDNational forewordThis British Standard is the UK implement
2、ation of EN 12350-10:2010.The UK participation in its preparation was entrusted to TechnicalCommittee B/517/1, Concrete production and testing.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessa
3、ryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 69214 7ICS 91.100.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committ
4、ee on 31 August 2010Amendments issued since publicationDate Text affectedBS EN 12350-10:2010EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12350-10 July 2010 ICS 91.100.30 English Version Testing fresh concrete - Part 10: Self-compacting concrete - L box test Essai pour bton frais - Partie 10:
5、 Bton auto-plaant - Essai la bote en L Prfung von Frischbeton - Teil 10: Selbstverdichtender Beton - L-Kasten-Versuch This European Standard was approved by CEN on 20 June 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this E
6、uropean 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 CEN Management Centre or to any CEN member. This European Standard exists in three official versions (En
7、glish, 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 the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgar
8、ia, Croatia, 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, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR S
9、TANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12350-10:2010: EBS EN 12350-10:2010EN 12350-10:2
10、010 (E) 2 Contents Page Foreword 31 Scope 52 Normative references 53 Principle 54 Apparatus .55 Test sample 76 Test procedure .77 Test result .88 Test report 89 Repeatability and reproducibility .8Bibliography . 10BS EN 12350-10:2010EN 12350-10:2010 (E) 3 Foreword This document (EN 12350-10:2010) ha
11、s 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 identical text or by endorsement, at the latest by January 2011, and confli
12、cting national standards shall be withdrawn at the latest by January 2011. 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 docume
13、nt has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). This standard is based on the results from the EU-project “Testing-SCC“ under the 5thFrame Programme (GRD2-2000-30024/G6RD-CT-
14、2001-00580). Owing to its significant advantages in the improvement of construction quality and working environment, self-compacting concrete (SCC) has been widely accepted by the construction owners. The use of SCC in practical concrete construction is steadily increasing. Since SCC has to give sat
15、isfactory in-situ properties (perfect filling of the mould and embedment of the reinforcement, homogeneity and full compaction) without vibration, the proper methods for testing the fresh SCC are very important. These should address three key properties: filling ability, passing ability and resistan
16、ce to segregation. It is desirable, especially in the case of new constituents or new concrete compositions, to test the consistence of fresh SCC before casting in place. A number of test methods including this test are available for testing fresh SCC. Most of the commonly used test methods were eva
17、luated in the recently closed EU-project “Testing-SCC“ under the 5thFrame Programme (GRD2-2000-30024/G6RD-CT-2001-00580). According to the results from this EU project, it seems no single test method can completely cover all three key properties. Nevertheless any test method should at least be corre
18、lated to the practical situation and give consistent results in order to provide reliable data for judgment of concrete consistence. This standard is one of a series concerned with testing fresh concrete. EN 12350, Testing fresh concrete, consists of the following parts: Part 1: Sampling Part 2: Slu
19、mp-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-compacting concrete Slump-flow test BS EN 12350-10:2010EN 12350-10:2010 (E) 4 Part 9: Self-compacting concrete V-funnel test Part 10: Self-compacting c
20、oncrete L box test Part 11: Self-compacting concrete Sieve segregation test Part 12: Self-compacting concrete J-ring test 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 w
21、ith 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. According to the CEN/CENELEC Internal Regulations, the n
22、ational standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlan
23、ds, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 12350-10:2010EN 12350-10:2010 (E) 5 1 Scope This European Standard specifies the procedure for determining the passing ability ratio for self-compacting concrete using the L box test.
24、2 Normative references The following referenced documents are indispensable for the application of this 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
25、concrete Part 1: Sampling 3 Principle The L box test is used to assess the passing ability of self-compacting concrete to flow through tight openings including spaces between reinforcing bars and other obstructions without segregation or blocking. There are two variations; the two bar test and the t
26、hree bar test. The three bar test simulates more congested reinforcement. A measured volume of fresh concrete is allowed to flow horizontally through the gaps between vertical, smooth reinforcing bars. The heights of the concrete in the vertical section (H1) and at the end of the horizontal section
27、(H2), see Figure 1, are measured and the ratio H2/H1determined. This ratio is a measure of the passing or blocking behaviour of SCC . 4 Apparatus 4.1 L box, having the general arrangement and internal dimensions as shown in Figure 1. The L box shall be of rigid construction with surfaces that are sm
28、ooth, flat and not readily attacked by cement paste or be liable to rusting. The vertical hopper may be removable for ease of cleaning. The bar positioning system shall be such that two smooth steel bars of (12 0,2) mm diameter will provide a gap of (59 1) mm for the two bar test and three smooth st
29、eel bars of (12 0,2) mm diameter will provide a gap of (41 1) mm for the three bar test. The system shall locate the bars in the L box so that they are vertical and equidistant across the width of the box, as shown in Figure 2. BS EN 12350-10:2010EN 12350-10:2010 (E) 6 Dimensions in millimetres Key
30、1 Sliding gate Figure 1 Typical general assembly of L box showing required dimensions BS EN 12350-10:2010EN 12350-10:2010 (E) 7 Dimensions in millimetres a) Clear bar space, (41 1) mm b) Clear bar space, (59 1) mmKey 1 12 0,2 mm diameter smooth steel bars Figure 2 Bar positions in L box The surface
31、of any material used in the assemblies shall not be readily attacked by cement paste or be liable to rusting. 4.2 Rule or measuring tape, of minimum length 500 mm and graduated at intervals not exceeding 1 mm, the zero mark being at the extreme end of the rule or measuring tape. 4.3 Containers, to h
32、old the sample and having a total volume not less than 14 l. 4.4 Spirit level, for checking horizontality of base of L box base prior to commencing the test. 4.5 Straight edge, for striking off concrete level with the top of the L box. 5 Test sample A sample of at least 14 l shall be obtained in acc
33、ordance with EN 12350-1. 6 Test procedure Support the L box on a level base and check for horizontality using the spirit level. Clean the L box and dampen immediately prior to testing, but keep free from excess moisture. Close the gate between the vertical and horizontal sections. Pour the concrete
34、from the container(s) into the filling hopper of the L box, without any agitation or mechanical compaction, then strike off the top with the straight edge so that the concrete is level with the top of the vertical section of the L box and allow to stand for (60 10) s. Check the concrete for signs of
35、 segregation before and after filling of the L box and report under item 8, d) in a qualitative way, e.g. no indication of segregation, strong indication of segregation. NOTE Signs of segregation include a layer of cement paste/mortar and segregated coarse aggregate at the top. Fully open the slidin
36、g gate in a smooth continuous action to allow the concrete to flow into the horizontal section. When movement has ceased, measure the drop in height of the level of concrete H1 to the nearest 1 mm in the vertical section on the gate side of the box at three positions equally spaced across the width
37、of the box. The mean depth of the concreteH1 is the difference between the height of vertical section and the average of the three readings of H1. Record H1to the nearest 1 mm. The same procedure is used to calculate the mean depth of the concrete at the end of the horizontal section of the L box H2
38、from the BS EN 12350-10:2010EN 12350-10:2010 (E) 8 difference with the height of the horizontal section and the average of the three readings of H2. Record H2to the nearest 1 mm. 7 Test result The passing ability ratio PL, as measured by the L box test, is calculated to the nearest 0,01 from the fol
39、lowing equation: 12HHPL = where PL is the passing ability ratio measured by the L box test; H1is the mean depth of concrete in the vertical section of the box, in millimetres; H2is the mean depth of concrete at the end of the horizontal section of the box, in millimetres. 8 Test report The test repo
40、rt shall include: a) identification of the test sample; b) location where the test was performed; c) date and time of test; d) any segregation or bleeding observed during filling of the L box; e) whether two bar or three bar test; f) passing ability ratio, PL, to the nearest 0,05; g) any deviation f
41、rom the standard test method; h) declaration by the person technically responsible for the test that it was carried out in accordance with this standard, except as noted in item g). The report may include: i) temperature of the concrete at the time of test; j) age of concrete at time of test (if kno
42、wn). 9 Repeatability and reproducibility The repeatability r and reproducibility R have been determined by a programme including eleven laboratories, 22 operators and two replicates, and interpreted in accordance with ISO 5725-2. The resulting values for r and R for the three bar test are given in T
43、able 1. BS EN 12350-10:2010EN 12350-10:2010 (E) 9 Table 1 Repeatability and reproducibility for typical values of the passing ability ratio Passing ability ratio PL 0,8 0,8 Repeatability r 0,11 0,13 Reproducibility R 0,12 0,16BS EN 12350-10:2010EN 12350-10:2010 (E) 10 Bibliography 1 ISO 5725-2, Accu
44、racy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of repeatability of a standard measurement method This page deliberately left blankBSI is the independent national body responsible for preparing British Standardsand other standards-related p
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