1、BSI Standards PublicationBS EN 13279-2:2014Gypsum binders and gypsumplastersPart 2: Test methodsBS EN 13279-2:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 13279-2:2014.It supersedes BS EN 13279-2:2004 which is withdrawn.The UK participation in its prepar
2、ation was entrusted to TechnicalCommittee B/544, Plastering, rendering, dry lining.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its co
3、rrectapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 82054 0ICS 91.100.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strate
4、gy Committee on 31 January 2014.Amendments issued since publicationDate Text affectedBS EN 13279-2:2014EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13279-2 January 2014 ICS 91.100.10 Supersedes EN 13279-2:2004English Version Gypsum binders and gypsum plasters - Part 2: Test methods Liants-pl
5、tres et enduits base de pltre pour le btiment -Partie 2: Mthodes dessai Gipsbinder und Gips-Trockenmrtel - Teil 2: PrfverfahrenThis European Standard was approved by CEN on 3 November 2013. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for g
6、iving 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 Centre or to any CEN member. This European Standard exists in three o
7、fficial 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 official versions. CEN members are the national standards bodies
8、 of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spai
9、n, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide
10、 for CEN national Members. Ref. No. EN 13279-2:2014 EBS EN 13279-2:2014EN 13279-2:2014 (E) 2 Contents Page Foreword 3 Introduction . 4 1 Scope 5 2 Normative references 5 3 Test conditions and sampling 5 3.1 Test atmosphere (reference test) . 5 3.2 Sampling . 5 3.3 Preparation of the sample . 5 3.4 W
11、ater . 5 3.5 Appliances and apparatus 6 4 Test methods for gypsum binders and gypsum plasters (including special purposes) . 6 4.1 Sieve analysis (Fineness) . 6 4.1.1 Apparatus . 6 4.1.2 Determination of particles retained on 5 000 m sieves . 6 4.1.3 Determination of particles retained on 200 m and
12、100 m sieves 7 4.2 Determination of sulphur trioxide content and calculation of equivalent calcium sulfate 7 4.2.1 Principle 7 4.2.2 Apparatus . 7 4.2.3 Reagents . 8 4.2.4 Procedure . 8 4.2.5 Expression of results 8 4.3 Determination of the water/plaster ratio 8 4.3.1 Sprinkling method . 8 4.3.2 Dis
13、persal method . 9 4.3.3 Flow table method . 10 4.4 Determination of the setting time . 12 4.4.1 Knife method 12 4.4.2 Vicat cone method . 13 4.5 Determination of mechanical properties . 14 4.5.1 Apparatus . 14 4.5.2 Preparation of the test specimen . 17 4.5.3 Determination of hardness . 17 4.5.4 Det
14、ermination of flexural strength . 18 4.5.5 Determination of compressive strength 18 4.6 Determination of adhesion . 19 4.6.1 Principle 19 4.6.2 Apparatus . 19 4.6.3 Procedure . 19 4.6.4 Expression of results 20 Annex A (informative) Water retention 22 Bibliography 23 BS EN 13279-2:2014EN 13279-2:201
15、4 (E) 3 Foreword This document (EN 13279-2:2014) has been prepared by Technical Committee CEN/TC 241 “Gypsum and gypsum based products”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or b
16、y endorsement, at the latest by July 2014, and conflicting national standards shall be withdrawn at the latest by July 2014. 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 iden
17、tifying any or all such patent rights. This document supersedes EN 13279-2:2004. This document on gypsum binders and gypsum plasters, EN 13279, Gypsum binders and gypsum plasters, consists of two parts: Part 1: Definitions and requirements; Part 2: Test methods. This document for gypsum binders and
18、gypsum plasters uses European standardized test methods as far as possible and where this was not applicable other appropriate proven test methods have been used. This document includes an informative Annex A concerning water retention. According to the CEN-CENELEC Internal Regulations, the national
19、 standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuan
20、ia, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 13279-2:2014EN 13279-2:2014 (E) 4 Introduction Figure 1 shows the family of gypsum binders and gypsum plasters Figure 1 Family of gypsum biners
21、and gypsum plasters BS EN 13279-2:2014EN 13279-2:2014 (E) 5 1 Scope This European Standard describes the reference test methods for all gypsum binders and gypsum plasters covered by EN 13279-1. 2 Normative references The following documents, in whole or in part, are normatively referenced in this do
22、cument and are indispensable for its application. For dated referenced, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 196-1:2005, Methods of testing cement - Part 1: Determination of strength EN 196-7, Met
23、hods of testing cement - Part 7: Methods of taking and preparing samples of cement EN 459-2:2010, Building lime - Part 2: Test methods EN 932-1, Tests for general properties of aggregates - Part 1: Methods for sampling ISO 565, Test sieves - Metal wire cloth, perforated metal plate and electroformed
24、 sheet - Nominal sizes of openings 3 Test conditions and sampling 3.1 Test atmosphere (reference test) Temperature of the test room, the equipment and the materials (plaster, water): (23 2) C Relative humidity of the air: (50 5) % 3.2 Sampling Sampling shall be carried out in accordance with EN 196-
25、7. Sample granular material in accordance with the procedures given in EN 932-1 for aggregates taking into account the need to minimise moisture and carbon dioxide absorption. The spot sample size shall be (8 3) kg. The test sample prior to testing shall be kept in hermetically sealed containers. 3.
26、3 Preparation of the sample Before carrying out tests, the mass of the sample shall be homogenised. Before carrying out chemical analyses, a representative sample of (50 5) g shall be taken and be ground to a particle size of 0,1 mm. 3.4 Water The water used for reference tests and chemical analyses
27、 shall be distilled or deionised. BS EN 13279-2:2014EN 13279-2:2014 (E) 6 3.5 Appliances and apparatus The apparatus used for gauging and the moulds used for preparing the test pieces, shall be free from leaks and shall be manufactured from a water resistant material which is non reactive to calcium
28、 sulphate (e.g. glass, brass, stainless steel, hardened steel, hard rubber and plastics). Soft plastic and rubber materials shall not be used. Since the characteristics of plasters are strongly influenced by the presence of particles of calcium sulphate dihydrate which can influence the setting time
29、, all the equipment used in the tests shall be kept in a perfect state of cleanliness. 4 Test methods for gypsum binders and gypsum plasters (including special purposes) 4.1 Sieve analysis (Fineness) 4.1.1 Apparatus a) Control sieves conforming to ISO 565: 1) 5 000 m, only for gypsum bricklaying pla
30、ster (C2); 2) 200 m and 100 m for fibrous gypsum plaster elements (C1, C7); 3) 1 500 m for fibrous plaster works and thin coat plaster (C1, C6); b) wooden or plastic spatula; c) balance accurate to 0,1 g; d) desiccator. 4.1.2 Determination of particles retained on 5 000 m sieves (see 4.1.1 a) 4.1.2.
31、1 Procedure From the hermetically sealed laboratory sample weigh 500 g 25 g and pass through a 5 000 m sieve (see 4.1.1 a), crushing any soft lumps with a spatula. Weigh the residue and examine any hard particles retained on the sieve. Repeat the procedure on a second sample. Expression of results E
32、xpress the mass retained on the sieve as a percentage of the total sample. Take the mean of the two results and record it in the test report. BS EN 13279-2:2014EN 13279-2:2014 (E) 7 4.1.3 Determination of particles retained on 200 m and 100 m sieves 4.1.3.1 Procedure Take approximately 200 g from th
33、e hermetically sealed sample and dry it to constant mass1)at (40 2) C. Cool in a desiccator to room temperature. Weigh 50 g 5 % and transfer to the test sieve. Hold the sieve in one hand, slightly tilted, and shake it, allowing it to strike the other hand on each movement at a rate of approximately
34、125 times per minute, so that the plaster always spreads out evenly. Every 25 movements turn the sieve through 90 degrees. After 1 min weigh the residue and return to the sieve. Continue sieving until the mass of plaster passing the sieve in 1 min does not exceed 0,4 g. After sieving for 3 min, brus
35、h any fine material adhering to the inner surface of the sieve frame onto the wire screen. Sieving is continued until the plaster passing the sieve in 1 min does not exceed 0,2 g. The underside of the wire screen surface is then brushed, and the brushings rejected, before the residue retained on the
36、 sieve is weighed. For the 100 m sieve the test is carried out in the same way and with the same limits as for the 200 m sieve. Repeat the procedure on a second sample. 4.1.3.2 Expression of results Express the mass retained on the sieve as a percentage of the total sample. Take the mean of the two
37、results for each of the sieve sizes and compare with the requirements. 4.2 Determination of sulphur trioxide content and calculation of equivalent calcium sulfate NOTE This test method applies to all types of plasters. 4.2.1 Principle The calcium sulfate is decomposed by digestion with hydrochloric
38、acid solution. Insoluble constituents are removed by filtration. The sulfate in the filtrate is determined gravimetrically as barium sulfate. 4.2.2 Apparatus a) Sieve 0,1 mm mesh; b) 250 ml and 400 ml beakers; c) rapid filtration funnels; d) muffle furnace; e) vitreosil ignition crucible, porosity 4
39、 or porous porcelain or silica crucible; f) filter paper capable of retaining particles greater than 2,5 m; g) balance to an accuracy of 0,001 g; h) desiccator. 1)Constant mass is defined as two successive weighings 24 h apart, differing by less than 0,1 %. BS EN 13279-2:2014EN 13279-2:2014 (E) 8 4.
40、2.3 Reagents a) Hydrochloric acid solution: 2 mol/l HCl; b) barium chloride: (10 % solution). 4.2.4 Procedure The sample is ground until it passes through a sieve with a mesh of 0,1 mm. 0,5 g of the sample dried at 40 C shall be boiled with 30 ml HCl 1:1 and 150 ml distilled H2O for 15 min to 20 min
41、 in a 250 ml beaker. Then it shall be filtered through a quantitative filter (red band) into a 400 ml beaker and washed with hot deionised water. The solution shall be boiled, and while stirring it SO3shall be precipitated with 25 ml 10 % barium chloride, brought to the boil, and then allowed to sta
42、nd for at least 12 h. The solution shall be filtered through a quantitative filter (red band) and washed using hot deionised water, until it is free of chloride. The filter residue shall be left to incinerate slowly in the crucible and ignited at 800 C until constant weight is achieved, then be cool
43、ed in a desiccator and weighed. The test shall be repeated. 4.2.5 Expression of results 4.2.5.1 Calculation of SO3The sulfate content expressed as SO3is calculated in percent from the Formula (1): pmBaSOSO100343,043=(1) where BaSO4is the mass of the barium sulfate BaSO4, in g; mpis the mass of the s
44、ample, in g. 4.2.5.2 Calculation of equivalent calcium-sulfate The equivalent calcium-sulfate is calculated in percent from the Formula (2): CaSO 1,7 x SO43= (2) 4.3 Determination of the water/plaster ratio NOTE There are no corresponding requirements in EN 132791. 4.3.1 Sprinkling method This metho
45、d is used for gypsum binders. 4.3.1.1 Principle Determination of the mass of the gypsum binder in grams which can be saturated when it is sprinkled into 100 g of water. BS EN 13279-2:2014EN 13279-2:2014 (E) 9 4.3.1.2 Apparatus a) Cylindrical glass container with 66 mm internal diameter and 66 mm hei
46、ght and with markings at a height of 16 mm and 32 mm above the inner surface of the base; b) chronometer; c) balance, accurate to 0,1 g. 4.3.1.3 Procedure Pour 100 g of water into the glass container, while taking care not to wet the upper part of the cylindrical wall. Determine the mass m0within 0,
47、5 g. The total time for the following procedure shall be (120 5) s. First sprinkle the plaster evenly over the surface of the water in such a way, that after 30 s the gypsum paste has reached the first marking and has reached the second marking after 60 s. Continue the sprinkling until the gypsum pa
48、ste has reached approximately 2 mm below the surface of the water after (90 10) s. During the following 20 s to 40 s, sufficient binder is sprinkled on to the surface of the water and the rim of the glass container that the water surface disappears. Any small dry islands of binder, which appear duri
49、ng the operation should be saturated at the end of 3 s to 5 s. In the case of binder which tends to settle slowly, the level marks may not be reached within the required time. In this case, the binder shall be sprinkled so that it falls only on to those areas of the water, which are free from binder and not on to binder which has already been sprinkled. The sprinkling time is to be stated. Before weighing remove surplus plaster from the rim of the glass container. Determine the mass m1, within 0,5 g. The test method i
