1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 480-8:2012Admixtures for concrete, mortar and grout Test methodsPart 8: Determination of the conventional dry material contentBS EN 480-8:2012 BRITISH STANDARDNational fore
2、wordThis British Standard is the UK implementation of EN 480-8:2012.It supersedes BS EN 480-8:1997 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee B/517/3, Admixtures.A list of organizations represented on this committee can beobtained on request to its
3、 secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012 ISBN 978 0 580 72908 9 ICS 91.100.10 Compliance with a British Standard
4、cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2012. Amendments issued since publicationDate Text affectedBS EN 480-8:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 480-8 May 20
5、12 ICS 01.040.91; 91.100.30 Supersedes EN 480-8:1996English Version Admixtures for concrete, mortar and grout - Test methods - Part 8: Determination of the conventional dry material content Adjuvants pour btons, mortier et coulis - Mthodes dessai - Partie 8: Dtermination de lextrait sec conventionne
6、l Zusatzmittel fr Beton, Mrtel und Einpressmrtel - Prfverfahren - Teil 8: Bestimmung des Feststoffgehalts This European Standard was approved by CEN on 13 April 2012. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Sta
7、ndard 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-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (Engli
8、sh, 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-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, B
9、ulgaria, 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, Turkey and United Kingdom. EUROPEAN CO
10、MMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 480-8:2012: EBS EN 480-8:2012EN 480
11、-8:2012 (E) 2 Contents Page Foreword 3g3Introduction .4g31 Scope 5g32 Principle 5g33 Apparatus .5g34 Procedure .5g35 Results 6g36 Test report 6g3Bibliography 7g3BS EN 480-8:2012EN 480-8:2012 (E) 3 Foreword This document (EN 480-8:2012) has been prepared by Technical Committee CEN/TC 104 “Concrete an
12、d 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 November 2012, and conflicting national standards shall be withdrawn at the latest by
13、November 2012. 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 document supersedes EN 480-8:1996. This draft European Standard is
14、 part of the series EN 480 “Admixtures for concrete, mortar and grout Test methods“ which comprises 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
15、 Part 6 Infrared analysis Part 8 Determination of the conventional dry material content Part 10 Determination 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 m
16、ortar for testing mortar admixtures Part 14 Determination of the effect on corrosion susceptibility of reinforcing steel by potentiostatic electro-chemical test Part 15 Reference concrete and method for testing viscosity modifying admixtures1)This standard is applicable together with the other stand
17、ards of the EN 480 series for testing admixtures in accordance with the EN 934 series of standards. In this revision drying the test specimen for a fixed period has been replaced by drying to constant weight. According to the CEN/CENELEC Internal Regulations, the national standards organizations of
18、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, Netherlands, Norway, Poland, Portugal, Roman
19、ia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. 1) In preparation. BS EN 480-8:2012EN 480-8:2012 (E) 4 Introduction The procedure in EN 480-8:1996 has been found to be unreliable for some types of admixture such as lignosulfonates and sugars. The procedure has now
20、been revised to include drying to constant weight using duplicate specimens with a requirement for maximum difference between results. Some materials used in admixtures are deliquescent so the option of using a bottle with a stopper to be inserted during weighing is included. Some liquid admixtures
21、form a skin during drying which prevents complete drying. In these circumstances EN 934-1 permits an alternative test procedure to be used. BS EN 480-8:2012EN 480-8:2012 (E) 5 1 Scope This European Standard describes a method for determining the conventional dry material content of an admixture. 2 P
22、rinciple A sample of admixture is dried in an oven at (105 3) C until a constant weight is reached. In the case of a liquid admixture this method shall be used to characterize the dry material content. For a powder admixture this method shall be used to determine the actual mass of the dried powder.
23、 NOTE This method is not suitable for determining the absolute solids content. 3 Apparatus 3.1 Weighing bottle, squat form, wide-mouthed with ground glass stopper or evaporating basin with a flat bottom and approximately 75 mm diameter 45 mm depth. 3.2 Desiccator, containing an efficient desiccant.
24、3.3 Drying Oven with forced ventilation, thermostatically controlled at (105 3) C, fitted with a temperature indicating device. The required temperature range shall be maintained throughout all parts of the oven used for this test. NOTE Forced ventilation is necessary to ensure uniform temperature t
25、hroughout the oven. 3.4 Balance, with a resolution of 0,5 mg. 4 Procedure Heat the weighing bottle with the stopper removed, or the evaporating basin, for at least one hour in a drying oven at (105 3) C. After cooling for 30 min in a desiccator weigh the weighing bottle with stopper inserted, or the
26、 evaporating basin. Repeat this procedure until the mass of the vessel is constant within a range of 1 mg. Spread (2,0 0,2) g of the sample in a uniform layer on the bottom of the vessel and weigh to the nearest 1 mg). NOTE 1 In order to obtain reproducible results it is essential that the mass of t
27、he dried residue or of the dried powder will be significant in relation to the mass of the vessel and the mass of the sample. Heat the weighing bottle and contents and the stopper with stopper removed, or the evaporating basin and contents, in the oven at (105 3) C for a minimum of 1 h. Insert the s
28、topper and transfer the weighing bottle, or evaporating basin, to the desiccator. Allow to cool in the desiccator with the stopper removed. Insert the stopper and weigh the weighing bottle, or evaporating basin, to the nearest 1 mg. Repeat the heating for at least 30 min, allow to cool in the desicc
29、ator and again weigh to the nearest 1 mg. Repeat the heating and cooling until two successive weighings differ by no more than 2 mg. Record the lower mass. Repeat the weighing and drying procedure using a fresh specimen from the same sample in order to obtain duplicate results. BS EN 480-8:2012EN 48
30、0-8:2012 (E) 6 NOTE 2 If this test method is not suitable, the manufacturer should specify a documented alternative test method (see EN 934-1). 5 Results The following formula shall be used to calculate the results: Dry material content %100=MRX by mass (1) where R is the mass of the residue in gram
31、s; M is the mass of admixture in grams; X is the dry material content in percent by mass. For an average dry material content g148 20 % the difference between the two results shall not exceed average dry material content multiplied by 0,04. For an average dry material content 20 % the difference bet
32、ween the two results shall not exceed 0,80 % by mass. If these differences are exceeded duplicate tests shall be repeated until the results agree within the maximum permitted difference. 6 Test report This shall include at least the following: a) a reference to this document (EN 480-8); b) name or c
33、ode of admixture tested (with information related to its marking); c) date of the test; d) name of the laboratory; e) name of the operator; f) type of vessel in which specimens dried; g) origin of the sample and date when taken; h) dry material content as mean of duplicate test results to 0,1 % by m
34、ass. BS EN 480-8:2012EN 480-8:2012 (E) 7 Bibliography EN 934-1, Admixtures for concrete, mortar and grout g650 Part 1: Common requirements This page deliberately left blankThis page deliberately left blankBSI is the independent national body responsible for preparing British Standards and other stan
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