DIN EN 772-5-2016 Methods of test for masonry units - Part 5 Determination of the active soluble salts content of clay masonry units German version EN 772-5 2016《圬工品试验方法 第5部分 粘土圬工品.pdf

1、August 2016 English price group 9No 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 91.100.25!%Y.C“2541132www.din.deDI

2、N EN 772-5Methods of test for masonry units Part 5: Determination of the active soluble salts content of clay masonry units;English version EN 772-5:2016,English translation of DIN EN 772-5:2016-08Prfverfahren fr Mauersteine Teil 5: Bestimmung des Gehalts an aktiven lslichen Salzen von Mauerziegeln;

3、Englische Fassung EN 772-5:2016,Englische bersetzung von DIN EN 772-5:2016-08Mthodes dessai des lments de maonnerie Partie 5: Dtermination de la teneur en sels solubles actifs des lments de maonnerie en terre cuite;Version anglaise EN 772-5:2016,Traduction anglaise de DIN EN 772-5:2016-08SupersedesD

4、IN EN 772-5:2002-03See start of applicationwww.beuth.deDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.Document comprises 12 pages 07.16 2 A comma is used as the decimal marker. Start of application The start of application of this

5、standard is 2016-08-01. For DIN 772-5:2002-03 there is a transition period ending on 2017-12-31. National foreword This document (EN 772-5:2016) has been prepared by Technical Committee CEN/TC 125 “Masonry” (Secretariat: BSI, United Kingdom). The responsible German body involved in its preparation w

6、as DIN-Normenausschuss Bauwesen (DIN Standards Committee Building and Civil Engineering), Working Committee NA 005-06-04 AA Prfverfahren (SpA zu CEN/TC 125/WG 4). The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 3310-1 DIN ISO 3310-1 ISO

7、 3310-2 DIN ISO 3310-2 Amendments This standard differs from DIN EN 772-5:2002-03 as follows: a) the crushing procedure in 7.2 has been amended so that the sample, after having been reduced to particles of not greater than approximately 1 mm in size, is dried in a ventilated oven to constant mass pr

8、ior to further grinding and sieving. Previous editions DIN EN 772-5: 2002-03 National Annex NA (informative) Bibliography DIN ISO 3310-1, Test sieves Technical requirements and testing Part 1: Test sieves of metal wire cloth DIN ISO 3310-2, Test sieves Technical requirements and testing Part 2: Test

9、 sieves of perforated metal plate DIN EN 772-5:2016-08EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 772-5 March 2016 ICS 91.100.25 Supersedes EN 772-5:2001English Version Methods of test for masonry units - Part 5: Determination of the active soluble salts content of clay masonry units Mthode

10、s dessai des lments de maonnerie - Partie 5:Dtermination de la teneur en sels solubles actifs deslments de maonnerie en terre cuite Prfverfahren fr Mauersteine - Teil 5: Bestimmung des Gehalts an aktiven lslichen Salzen von Mauerziegeln This European Standard was approved by CEN on 3 January 2016. C

11、EN members are bound to comply with the CEN/CENELEC 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 ap

12、plication to the CEN-CENELEC Management Centre 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

13、Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, L

14、atvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue M

15、arnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 772-5:2016 EEN 772-5:2016 (E) 2 Contents Page European foreword . 3 1 Scope 4 2 Normative references 4 3 Principle . 4 4 Symbols . 4 5 Materials . 4 5.1

16、 For all methods 4 5.2 Instrumental method Atomic Absorption Spectroscopy (AAS) and flame photometry 5 5.3 Instrumental method Atomic Absorption Spectroscopy (AAS) and flame photometry or inductively coupled plasma spectrometry (ICP) 5 5.4 EDTA method (alternative) . 5 6 Apparatus . 5 7 Preparation

17、of sample . 6 7.1 Sampling . 6 7.2 Crushing 6 8 Extraction procedure . 6 9 Determinations of cations by instrumental techniques . 6 9.1 General 6 9.2 Atomic absorption spectroscopy method (AAS) and flame photometry 6 9.2.1 Sample preparation 6 9.2.2 Calibration: preparation of the reference series .

18、 7 9.2.3 Spectroscopic lines and parameters for AAS and flame photometry analysis . 7 9.3 Inductively coupled plasma spectrometry method (ICP) . 8 9.3.1 General 8 9.3.2 Spectroscopic lines for ICP analysis . 8 9.4 Calculation of the results 8 10 Alternative method of determination of the content of

19、active soluble salts . 9 10.1 Preparations of reagents for magnesium determination . 9 10.1.1 Magnesium test solution (1,0 mg Mg/ml) 9 10.1.2 Preparation of EDTA test solution (0,5 %) 9 10.2 First titration (calcium plus magnesium) 9 10.3 Second titration (calcium) . 9 10.4 Magnesium content 9 10.5

20、Determination of sodium and potassium . 9 11 Expression of results . 10 12 Test report 10 DIN EN 772-5:2016-08 EN 772-5:2016 (E) 3 European foreword This document (EN 772-5:2016) has been prepared by Technical Committee CEN/TC 125 “Masonry”, the secretariat of which is held by BSI. This European Sta

21、ndard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2016, and conflicting national standards shall be withdrawn at the latest by December 2017. Attention is drawn to the possibility that some of the elements

22、 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 772-5:2001. The crushing procedure in 7.2 has been amended so that the sample, after reducing to particles of not greater

23、 than approximately 1 mm in size, is dried in a ventilated oven to constant mass prior to further grinding and sieving. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. According to the CEN/CENELEC Internal Regulations,

24、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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lat

25、via, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 772-5:2016-08EN 772-5:2016 (E) 4 1 Scope This European Standard specifies a method for determining the active soluble salts content

26、 of clay masonry units. 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

27、 771-1, Specification for masonry units Part 1: Clay masonry units ISO 3310-1, Test sieves Technical requirements and testing Part 1: Test sieves of metal wire cloth ISO 3310-2, Test sieves Technical requirements and testing Part 2: Test sieves of perforated metal plate 3 Principle The method adopte

28、d is based on water extraction from a crushed representative sample of the clay masonry units, and determines the amounts of soluble magnesium, sodium and potassium ions, released under the test conditions, which may be correlated with the potentially damaging effect of salts of those ions on cement

29、itious mortars in certain circumstances, or even on the units themselves. These salts are known as active soluble salts in EN 771-1. 4 Symbols MMgis the number of milligrams of Mg equivalent to 1 ml of EDTA x,y is the volume of EDTA titrated, en millilitres (ml) C1is the lower reference sample conce

30、ntration, in percentage (%) C2is the higher reference sample, concentration, in percentage (%) Cxis the sample concentration, in percentage (%) E1is the measured signal for the lower reference sample concentration C1E2is the measured signal for the higher reference sample, concentration C2Exis the m

31、easured signal for sample d is the dilution factor 5 Materials 5.1 For all methods Distilled or deionized water for extraction of active soluble salts from the sample, and for preparation of analytical test solutions. Hydrochloric acid (relative density 1,18). All chemicals shall be of analytical re

32、agent grade. DIN EN 772-5:2016-08EN 772-5:2016 (E) 5 5.2 Instrumental method Atomic Absorption Spectroscopy (AAS) and flame photometry Hydrated Lanthanum chloride LaCL3 7H2O, 210 g/l Solution Caesium Chloride CsCl, 63 g/l Solution 5.3 Instrumental method Atomic Absorption Spectroscopy (AAS) and flam

33、e photometry or inductively coupled plasma spectrometry (ICP) High purity standard solutions 5.4 EDTA method (alternative) Magnesium metal Ethylenediamine tetra acetic acid (EDTA) Indicators: Calcein Methyl thymol blue complexone Potassium hydroxide Ammonia solution (relative density 0,88) Potassium

34、 nitrate 6 Apparatus 6.1 Test sieves, complying with the requirements of ISO 3310-1, ISO 3310-2 6.2 Mortar or other suitable grinding equipment capable of producing particles to pass a 150 m test sieve. 6.3 Polyethylene bottle or Conical flask, typically with a capacity 500 ml 6.4 Weighing instrumen

35、t, readable to the nearest 0,1 mg 6.5 Burette, typically 10 ml 6.6 Pipette, typically 10 ml, 50 ml 6.7 Graduated flask, typically 1 l 6.8 Volumetric flask, typically 100 ml 6.9 One dimensional horizontal shaking equipment, capable of oscillating at (120 5) min1having a horizontal movement of 20 mm,

36、or a rotary shaker capable of revolving at 30 3 revolutions per minute. 6.10 Polyethylene bottle, typically with a capacity of between 1 l and 1,5 l. 6.11 Ventilated oven, capable of maintaining a temperature of (105 5) C DIN EN 772-5:2016-08 EN 772-5:2016 (E) 6 7 Preparation of sample 7.1 Sampling

37、The method of sampling shall be in accordance with EN 771-1. The minimum number of specimens for the determination of the active soluble salts content shall be six and shall comprise whole units but a larger number may be specified in the product specification, in which case that larger number shall

38、 be used. The specimens shall be sampled in such a manner that they have not been exposed to water that would lead to leaching of soluble salts from the units. From the bulk sample of units a representative sample of 50 g to 250 g of material, ground to pass a 150 m test sieve (6.1), is prepared, us

39、ing the crushing method described in 7.2. 7.2 Crushing Crush each unit to give lumps not greater than 10 mm. Obtain from each crushed specimen a representative subsample of at least 50 g, either by coning and quartering or using a suitable mechanical sampling device. Mix this material and crush it t

40、o give particles not greater than approximately 1 mm. Reduce the prepared sample to 50 g to 250 g using the same splitting method. Dry the crushed sample to constant mass in a ventilated oven at a temperature of (105 5) C. Before weighing, the sample shall be cooled to room temperature in a dessicat

41、or. Constant mass is achieved, when the loss in mass between two successive determinations conducted at an interval of 24 h during the drying, process does not exceed 0,2 % of the total mass. Finally grind the complete sample such that 95 % will pass a 150 m test sieve (6.1) complying with ISO 3310-

42、1 or ISO 3310-2, using a mortar (6.2) or other suitable grinding equipment. 8 Extraction procedure Weigh 20 g 0,05 g of the sample and transfer it to a 500 ml polyethylene bottle, or a 500 ml conical flask (6.3) when using horizontal shaking equipment (6.9). Add 200 ml of distilled or deionised wate

43、r at room temperature, close the bottle with a screw-on polyethylene top and shake the bottle for 60 min 2 min, using a one dimensional horizontal shaking equipment at (120 5) min1with a horizontal movement of 20 mm, or a rotary shaker (6.9) revolving at 30 min1 3 min1. Within 15 min 1 min of comple

44、ting the extraction filter the suspended sample using an ashless blue ribbon filter paper or equivalent and collect the filtrate in a clean dry flask (6.10). Do not wash the residue on the filter. Alternatively use a centrifuge. It is essential that the filtrate shall be clear. 9 Determinations of c

45、ations by instrumental techniques 9.1 General Determine the metal ion content using an established method, e.g. inductively coupled plasma spectrometry, atomic absorption spectroscopy, or flame photometry. Alternatively determine and calculate the magnesium content following the procedure described

46、in Clause 10. 9.2 Atomic absorption spectroscopy method (AAS) and flame photometry 9.2.1 Sample preparation Pipette (6.6) a 50 ml aliquot of the soluble salts extract into a 100 ml volumetric flask (6.8) add 4 ml of hydrochloric acid (1 + 1 volume) and 4 ml of lanthanum chloride. If Na and K are to

47、be measured by AAS, add 4 ml of caesium chloride. Fill to the mark with water and mix. DIN EN 772-5:2016-08 EN 772-5:2016 (E) 7 9.2.2 Calibration: preparation of the reference series Either: a) use dilutions of commercially available standard solutions, magnesium 1 000 /g, potassium 1 000 /g, sodium

48、 1 000 /g or, b) use a multi-element solution for example: 1) weigh the following substances up to nearest 0,1 mg; 2) 1 000 mg magnesium metal; 3) 1 767,3 mg potassium carbonate K2CO3dried to 105 C 5 C; 4) 2 305,1 mg sodium carbonate Na2CO3dried to 105 C 5 C; 5) add 50 ml of hydrochloric acid (1+1 v

49、olume) wait till the reaction is completed and warm up carefully on a heating plate until complete dissolution; complete to the mark in a 1 000 ml graduated flask (6.7). All chemicals shall be of analytical reagent grade. Then prepare a series of reference solutions as suggested in Table 1. Table 1 Suggested reference solution series Solution Volume of standard solutions or multi- element solution each other dilut