1、August 2012 Translation by DIN-Sprachendienst.English price group 7No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS
2、91.100.10; 91.100.30!$u_“1908260www.din.deDDIN EN 480-8Admixtures for concrete, mortar and grout Test methods Part 8: Determination of the conventional dry material content;English version EN 480-8:2012,English translation of DIN EN 480-8:2012-08Zusatzmittel fr Beton, Mrtel und Einpressmrtel Prfverf
3、ahren Teil 8: Bestimmung des Feststoffgehalts;Englische Fassung EN 480-8:2012,Englische bersetzung von DIN EN 480-8:2012-08Adjuvants pour btons, mortier et coulis Mthodes dessai Partie 8: Dtermination de lextrait sec conventionnel;Version anglaise EN 480-8:2012,Traduction anglaise de DIN EN 480-8:20
4、12-08SupersedesDIN EN 480-8:1997-02www.beuth.deDocument comprises 9 pagesIn case of doubt, the German-language original shall be considered authoritative.07.12 DIN EN 480-8:2012-08 2 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee CEN/T
5、C 104 “Concrete and related products” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was the Normenausschuss Bauwesen (Building and Civil Engineering Standards Committee), Working Committee NA 005-07-23 AA Betonzusatzmittel (SpA zu CEN/TC 104/SC 3). Amendments T
6、his standard differs from DIN EN 480-8:1997-02 as follows: a) the standard has been editorially revised; b) an introduction has been added; c) the former Clause 2 “Normative references” has been deleted; d) Clause 6 “Test report” has been extended; e) a bibliography has been added. Previous editions
7、 DIN EN 480-8: 1997-02 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 480-8 May 2012 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,
8、mortier et coulis - Mthodes dessai -Partie 8: Dtermination de lextrait sec conventionnel 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/C
9、ENELEC Internal Regulations which stipulate the conditions for giving this European 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-CENELEC Management Centr
10、e or to any CEN member. This European Standard exists in three official versions (English, 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
11、official versions. CEN members are the national standards bodies of 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, Romania,
12、 Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE 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 reser
13、ved worldwide for CEN national Members. Ref. No. EN 480-8:2012: EEN 480-8:2012 (E) 2 Contents Page Foreword 3Introduction .41 Scope 52 Principle 53 Apparatus .54 Procedure .55 Results 66 Test report 6Bibliography 7DIN EN 480-8:2012-08 EN 480-8:2012 (E) 3 Foreword This document (EN 480-8:2012) has be
14、en 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 November 2012, and conflicti
15、ng national standards shall be withdrawn at the latest by 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
16、 supersedes EN 480-8:1996. This draft European Standard is 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 bleedin
17、g of concrete Part 5 Determination of capillary absorption 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 th
18、e alkali content of admixtures Part 13 Reference masonry mortar 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
19、)This standard is applicable together with the other standards 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 Inte
20、rnal Regulations, the national 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, Luxem
21、bourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. 1) In preparation. DIN EN 480-8:2012-08 EN 480-8:2012 (E) 4 Introduction The procedure in EN 480-8:1996 has been found to be unreliable for some types of admix
22、ture such as lignosulfonates and sugars. The procedure has now 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 b
23、e inserted during weighing is included. Some liquid admixtures form a skin during drying which prevents complete drying. In these circumstances EN 934-1 permits an alternative test procedure to be used. DIN EN 480-8:2012-08 EN 480-8:2012 (E) 5 1 Scope This European Standard describes a method for de
24、termining the conventional dry material content of an admixture. 2 Principle 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 me
25、thod shall be used to determine the actual mass of the dried powder. 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 diame
26、ter 45 mm depth. 3.2 Desiccator, containing an efficient desiccant. 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.
27、NOTE Forced ventilation is necessary to ensure uniform temperature throughout 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
28、a desiccator weigh the weighing bottle with stopper inserted, or the 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 ord
29、er to obtain reproducible results it is essential that the mass of the 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 c
30、ontents, in the oven at (105 3) C for a minimum of 1 h. Insert the stopper 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.
31、 Repeat the heating for at least 30 min, allow to cool in the desiccator 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 sam
32、e sample in order to obtain duplicate results. DIN EN 480-8:2012-08 EN 480-8:2012 (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 materia
33、l content %100=MRX by mass (1) where R is the mass of the residue in grams; M is the mass of admixture in grams; X is the dry material content in percent by mass. For an average dry material content 20 % the difference between the two results shall not exceed average dry material content multiplied
34、by 0,04. For an average dry material content 20 % the difference between 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
35、 following: a) a reference to this document (EN 480-8); b) name or code 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 mass. DIN EN 480-8:2012-08 EN 480-8:2012 (E) 7 Bibliography EN 934-1, Admixtures for concrete, mortar and grout Part 1: Common requirements DIN EN 480-8:2012-08
