1、BRITISH STANDARDBS EN 480-4:2005Admixtures for concrete, mortar and grout Test methods Part 4: Determination of bleeding of concreteThe European Standard EN 480-4:2005 has the status of a British StandardICS 91.100.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54
2、g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 480-4:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 November 2005 BSI 28 November 2005ISBN 0 580 47320 1Nation
3、al forewordThis British Standard is the official English language version of EN 480-4:2005. It supersedes BS EN 480-4:1997 which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee B/517, Concrete, to Subcommittee B/517/3, Admixtures, which has the responsibilit
4、y to: A list of organizations represented on this subcommittee can be obtained on request to its secretary.The UK has drawn the attention of CEN to an error in the definition of w in clause 4; it is a ratio not a percentage. The words “in percent” should be ignored.Cross-referencesThe British Standa
5、rds which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This p
6、ublication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible interna
7、tional/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title pag
8、e, pages 2 to 5 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 480-4October 2005ICS 91.100.30 Supersedes EN 480-4:1996 English
9、VersionAdmixtures for concrete, mortar and grout - Test methods - Part4: Determination of bleeding of concreteAdjuvants pour bton, mortier et coulis - Mthodes dessai -Partie 4: Dtermination du ressuage du btonZusatzmittel fr Beton, Mrtel und Einpressmrtel -Prfverfahren - Teil 4: Bestimmung derWasser
10、absonderung des Betons (Bluten)This European Standard was approved by CEN on 28 July 2005.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 lis
11、ts and bibliographical references concerning such nationalstandards 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 language made by translationunder the responsi
12、bility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, It
13、aly, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels
14、2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 480-4:2005: EEN 480-4:2005 (E) 2 Contents Page Foreword 3 1 Scope .4 2 Apparatus 4 3 Procedure 4 4 Results.5 5 Test report .5 EN 480-4:2005 (E) 3 Foreword This European Standard (E
15、N 480-4:2005) 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 identical text or by endorsement, at the latest by April 20
16、06, and conflicting national standards shall be withdrawn at the latest by April 2006. It has been drafted by Subcommittee 3 (SC 3) of TC 104 “Admixtures for concrete, mortar and grout“. This document is part of the series EN 480 “Admixtures for concrete, mortar and grout Test methods“ which compris
17、es the following Part 1 Reference concrete and reference mortar for testing Part 2 Determination of setting time Part 4 Determination of bleeding of concrete Part 5 Determination of capillary absorption Part 6 Infrared analysis Part 8 Determination of the conventional dry material content Part 10 De
18、termination of water soluble chloride content Part 11 Determination of air void characteristics in hardened concrete Part 12 Determination of the alkali content of admixtures Part 13 Reference masonry mortar for testing mortar admixtures Part 14 Admixtures for concrete, mortar and grout - Test metho
19、ds - Part 14: Measurement of corrosion susceptibility of reinforcing steel in concrete - Potentiostatic electro-chemical test method 1)This document is applicable together with the other standards of the EN 480 series. This document supersedes EN 480-4:1996. According to the CEN/CENELEC Internal Reg
20、ulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands,
21、Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. 1) This part is under preparation EN 480-4:2005 (E) 4 1 Scope This document describes a method to determine the relative quantity of mixing water that will bleed from a sample of freshly mixed concrete. This
22、 method applies to concrete mixes with aggregates having a maximum size up to 50 mm. 2 Apparatus 2.1 A rigid cylindrical vessel of inside diameter of (250 10) mm and inside height of (280 10) mm with a removable lid. The vessel shall be made from non-absorbent material that will not react with the b
23、inder and the inside shall be smooth and free from corrosion, coatings or lubricants; 2.2 Balance of sufficient capacity to weigh the load required with an accuracy of 0,1 %; 2.3 Pipette, or other similar instrument, to draw off the free water from the surface of the test specimen; 2.4 Graduated 100
24、 ml measuring cylinder to collect and measure the amount of water withdrawn; 2.5 Cylindrical steel tamper, approximately 16 mm in diameter and 600 mm long with a hemispherical end; 2.6 Scoop; 2.7 Stopwatch; 2.8 Flat rounded steel float with a diameter of (100 10) mm. 3 Procedure The vessel (2.1) sha
25、ll be filled with a representative sample of the concrete to be tested to a height of (250 10) mm as follows: using the scoop (2.6), fill the container in three layers, each corresponding to a third of the whole volume, and compact each layer with 25 strokes of the tamper (2.5). The tamper strokes s
26、hall be distributed uniformly over the whole section and the different layers shall be compacted so that the tamper penetrates each layer as far as the surface of underlying layer, but not beyond. The compaction of the concrete may be completed by vibration except when testing for declaration of con
27、formity and certification purposes. Level the top of the concrete to a reasonably smooth surface by a minimum amount of troweling using the float (2.8). Determine the weight of the sample. The room in which the test is carried out shall have a temperature of (20 2) C and a relative humidity not less
28、 than 65 %. Place the vessel on a level platform or floor free of vibration and cover it with a suitable lid. Keep this lid in place throughout the test except when drawing off the water. EN 480-4:2005 (E) 5 Using a pipette (2.3) (or similar instrument), draw off the water that has accumulated on th
29、e surface at 10 min intervals during the first 40 min and at 30 min intervals thereafter until cessation of bleeding. To facilitate the collection of the bleed water, the container may be tilted carefully, by placing a small block not more than 50 mm high under one side of the container, 2 min befor
30、e the water is withdrawn. In this case, after removing the water, return the container to the vertical position carefully, without jarring. After each withdrawal, transfer the water to the measuring cylinder (2.4) and record the accumulated quantity of water. 4 Results The bleeding B is expressed as
31、 a percentage of the total water in the concrete as follows: 100=swmwmB (1) where mwis the mass of the bleed water, in grams msis the mass of the sample, in grams w is the proportion of water in the fresh concrete by mass in percent It is assumed that the density of the bleed water is 1 kg/l. 5 Test
32、 report The bleeding shall be recorded as a percentage of the total amount of water to the nearest 0,1 %. The test report shall contain: Date of test, Bleeding water recorded as a percentage of the total amount of water to the nearest 0,1 %, Details of concrete tested, including maximum size of aggr
33、egate, Details of the admixture used in the concrete mix, Person who performed the test. BS EN 480-4:2005BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Eur
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