Building lime - Part 2: Test methods

This European Standard describes the test methods for all building limes covered by EN 459-1:2010. This European Standard specifies the methods used for the chemical analyses and the determination of physical properties of building limes. This document describes the reference methods and, in certain cases, an alternative method which can be considered to be equivalent. In the case of a dispute, only the reference methods are used. Any other methods may be used provided they are calibrated, either against the reference methods or against internationally accepted reference materials, in order to demonstrate their equivalence.

Baukalk - Teil 2: Prüfverfahren

Diese Europäische Norm beschreibt Prüfverfahren für alle Baukalke, die in EN 459-1:2008 enthalten sind.
Diese Europäische Norm beschreibt Referenzprüfverfahren und in einigen Fällen Alternativprüfverfahren. Im Streitfall ist nur das Referenzverfahren maßgebend.
Werden andere als die folgenden Verfahren angewendet, so ist nachzuweisen, dass ihre Ergebnisse den Ergebnissen der Referenzverfahren entsprechen.

Chaux de construction - Partie 2: Méthodes d’essai

La présente Norme européenne décrit les méthodes d'essai applicables à toutes les chaux de construction
faisant l'objet de I'EN 459-1:2010.
La présente norme européenne prescrit les méthodes utilisées pour les analyses chimiques et la
détermination des propriétés physiques des chaux de construction.
Le présent document décrit les méthodes de référence et, dans certains cas, une variante qui peut être
considérée comme équivalente. En cas de litige, seules les méthodes de référence sont utilisées.
II est possible d'utiliser d'autres méthodes à condition de démontrer qu'elles aient été étalonnées soit avec les
méthodes de référence, soit avec des matériaux de référence acceptés au niveau international pour
démontrer leur équivalence..

Gradbeno apno - 2. del: Metode preskušanja

Ta evropski standard opisuje preskusne metode za vsa gradbena apna, ki jih zajema EN 459-1:2010. Ta evropski standard določa metode, ki se uporabljajo za kemične analize in ugotavljanje fizikalnih lastnosti gradbenega apna. Ta dokument opisuje referenčne metode in v določenih primerih alternativno metodo, ki velja za enakovredno. V primeru spora se uporabljajo samo referenčne metode. Druge metode se lahko uporabljajo, če so kalibrirane glede na referenčne metode ali glede na mednarodno sprejete referenčne materiale, kar je dokaz njihove enakovrednosti.

General Information

Status
Withdrawn
Public Enquiry End Date
14-Dec-2008
Publication Date
14-Nov-2010
Withdrawal Date
21-Jul-2021
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
22-Jul-2021
Due Date
14-Aug-2021
Completion Date
22-Jul-2021

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Gradbeno apno - 2. del: Metode preskušanjaBaukalk - Teil 2: PrüfverfahrenChaux de construction - Partie 2: Méthodes d’essaiBuilding lime - Part 2: Test methods91.100.10Cement. Mavec. Apno. MaltaCement. Gypsum. Lime. MortarICS:Ta slovenski standard je istoveten z:EN 459-2:2010SIST EN 459-2:2010en,de01-december-2010SIST EN 459-2:2010SLOVENSKI

STANDARDSIST EN 459-2:20021DGRPHãþD
SIST EN 459-2:2010
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 459-2
September 2010 ICS 91.100.10 Supersedes EN 459-2:2001English Version
Building lime - Part 2: Test methods
Chaux de construction - Partie 2: Méthodes d'essai

Baukalk - Teil 2: Prüfverfahren This European Standard was approved by CEN on 30 July 2010.

CEN 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 application to the CEN 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 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 459-2:2010: ESIST EN 459-2:2010

EN 459-2:2010 (E) 2 Contents Page Foreword ..............................................................................................................................................................3Introduction .........................................................................................................................................................41Scope ......................................................................................................................................................52Normative references ............................................................................................................................53Sampling .................................................................................................................................................53.1General ....................................................................................................................................................53.2Sampling of powdered material ...........................................................................................................53.3Sampling of granular material ..............................................................................................................53.4Sampling of lime putty and milk of lime ..............................................................................................53.5Preparation of the test portion .............................................................................................................64General requirements for testing .........................................................................................................64.1Number of tests ......................................................................................................................................64.2Repeatability and reproducibility .........................................................................................................74.3Expression of masses, volumes, factors and results ........................................................................74.4Blank determinations ............................................................................................................................74.5Reagents .................................................................................................................................................74.6Evaluation of test results ......................................................................................................................85Chemical analysis ..................................................................................................................................85.1Extraction with hydrochloric acid ........................................................................................................85.2Calcium oxide (CaO) and magnesium oxide (MgO) ...........................................................................95.3Sulfate (expressed as SO3) ................................................................................................................ 125.4Free water ............................................................................................................................................ 145.5Gravimetric determination of carbon dioxide (CO2) (reference method) ...................................... 155.6Volumetric determination of carbon dioxide (CO2) (alternative method) ..................................... 185.7Loss on ignition .................................................................................................................................. 215.8Available lime ...................................................................................................................................... 226Physical tests ...................................................................................................................................... 246.1Particle size by dry sieving ................................................................................................................ 246.2Particle size by air-jet sieving ............................................................................................................ 256.3Bulk density ......................................................................................................................................... 276.4Soundness ........................................................................................................................................... 306.5Setting times ....................................................................................................................................... 376.6Reactivity ............................................................................................................................................. 416.7Yield ..................................................................................................................................................... 476.8Standard mortar by mass and water demand for values of flow and penetration ....................... 486.9Water retention .................................................................................................................................... 536.10Determination of air content .............................................................................................................. 556.11Compressive strength ........................................................................................................................ 57Annex A (informative)

Example for the calculation of the results on sieving ........................................... 61Annex B (informative)

Precision data for the test methods ......................................................................... 62Bibliography ..................................................................................................................................................... 64 SIST EN 459-2:2010

EN 459-2:2010 (E) 3 Foreword This document (EN 459-2:2010) has been prepared by Technical Committee CEN/TC 51 “Cement and building limes”, the secretariat of which is held by NBN. 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 March 2011, and conflicting national standards shall be withdrawn at the latest by March 2011. 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 459-2:2001. The following modifications have been made from EN 459-2:2001:  description of chemical procedures for CaO, MgO, CO2 gravimetrically, SO3 and loss on ignition;  amendments for the determinations of free water and available lime;  description of the methods for particle size determination;  description of the determination of setting times;  amendments for the determination of strength;  editorial changes were made and minor mistakes corrected. EN 459, Building lime, consists of the following parts:  Part 1: Definitions, specifications and conformity criteria  Part 2: Test methods  Part 3: Conformity evaluation The existing standards from the EN 196 series were used as a basis for the testing of physical and mechanical properties in EN 459-2. For the testing of chemical properties of building limes, test methods described in EN 12485 have been incorporated into this European Standard. According to the CEN/CENELEC Internal 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, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.

SIST EN 459-2:2010

EN 459-2:2010 (E) 4 Introduction The objective in this European Standard has been to adopt as many European standardized methods as possible and where this has not been possible to use other appropriate proven methods. Unless otherwise stated, tolerance class m of ISO 2768-1:1989 should be applied (indications on drawings by "ISO 2768-m"). All dimensions are in millimetres. SIST EN 459-2:2010

EN 459-2:2010 (E) 5 1 Scope This European Standard describes the test methods for all building limes covered by EN 459-1:2010. This European Standard specifies the methods used for the chemical analyses and the determination of physical properties of building limes. This document describes the reference methods and, in certain cases, an alternative method which can be considered to be equivalent. In the case of a dispute, only the reference methods are used. Any other methods may be used provided they are calibrated, either against the reference methods or against internationally accepted reference materials, in order to demonstrate their equivalence. 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 196-1:2005, Methods of testing cement — Part 1: Determination of strength EN 196-3, Methods of testing cement — Part 3: Determination of setting times and soundness EN 196-7, Methods of testing cement — Part 7: Methods of taking and preparing samples of cement EN 459-1:2010, Building lime — Part 1: Definitions, specifications and conformity criteria EN 932-1, Tests for general properties of aggregates — Part 1: Methods for sampling EN ISO 6506-1:2005, Metallic materials — Brinell hardness test — Part 1: Test method (ISO 6506-1:2005) 3 Sampling 3.1 General Sampling shall be carried out as specified in 3.2 to 3.4 taking into account the need to minimize moisture and carbon dioxide absorption. Samples shall therefore be transported and stored in air-tight containers and all the handling shall be carried out as quickly as possible. 3.2 Sampling of powdered material Sampling shall be carried out in accordance with EN 196-7. 3.3 Sampling of granular material Sampling shall be carried out in accordance with EN 932-1. 3.4 Sampling of lime putty and milk of lime The spot sample size shall be (10 ± 5) dm3. Where lime putty or milk of lime is sampled, the increments shall be blended thoroughly.

SIST EN 459-2:2010

EN 459-2:2010 (E) 6 3.5 Preparation of the test portion Before carrying out the analysis, the sample shall be reduced in mass by means of a sample divider and/or by quartering to produce a homogeneous test sample of suitable mass for the intended determinations. Lime putty and milk of lime shall be dried before the chemical analysis (see 5.4.4.2).

The sample preparation for the appropriate test is described in Table 1. Table 1

Sample preparation for the single tests Test Clause in this standard Type and form of the building lime Sample preparation Chemical analysis 5 All types of building lime The sample of granular material shall be crushed and ground. All tests shall be performed on materials of a grain size ≤ 0,2 mm Grain size distribution by sieving 6.1 and 6.2 Quicklime Material in the as-delivered state Grain size distribution by air-jet sieving 6.2 Hydrated lime, hydrated dolomitic lime, lime with hydraulic properties Material in the as-delivered state Bulk density 6.3 All types of building lime See 6.3.2 Soundness 6.4.2.1 and 6.4.2.2 Hydrated lime, lime with hydraulic properties Material in the as-delivered state 6.4.2.3 Hydraulic lime with an SO3 content of more than 3 % and up to 7 % Material in the as-delivered state 6.4.3 Hydrated lime, lime putty und hydrated dolomitic lime Material in the as-delivered state 6.4.4 Quicklime, lime putty, dolomitic quicklime, hydrated dolomitic lime See 6.4.4.3.1 Setting times 6.5 Lime with hydraulic propertiesMaterial in the as-delivered state Reactivity 6.6 Quicklime The test shall be performed on materials of a grain size ≤ 0,2 mm. If 100 % of the material pass the 5 mm sieve the product can alternatively be tested in the as-delivered state Yield 6.7 Quicklime See 6.7.2 Mortar tests 6.8 to 6.10 Hydrated lime, hydrated dolomitic lime, lime with hydraulic properties Material in the as-delivered state Compressive strength 6.11 Lime with hydraulic propertiesMaterial in the as-delivered state

4 General requirements for testing 4.1 Number of tests Analysis of a building lime may require the determination of a number of its chemical properties. For each determination one or more tests shall be carried out in which the number of measurements to be taken shall be as specified in the relevant clause of this standard. Where the analysis is one of a series subject to statistical control, determination of each chemical property by a single test shall be the minimum required. SIST EN 459-2:2010

EN 459-2:2010 (E) 7 Where the analysis is not part of a series subject to statistical control, the number of tests for determination of each chemical property shall be 2 (see also 4.3). In the case of a dispute, the number of tests for determination of each chemical property shall be 2 (see also 4.3). 4.2 Repeatability and reproducibility Repeatability — Precision under repeatability conditions where independent test results are obtained with the same method on identical test items (material) in the same laboratory by the same operator using the same equipment within short intervals of time. Reproducibility — Precision under reproducibility conditions where test results are obtained with the same method on identical test items (material) in different laboratories with different operators using different equipment. Repeatability and reproducibility in this document (see Annex B) are expressed as repeatability standard deviation(s) and reproducibility standard deviation(s) in e.g. absolute percent, grams, etc., according to the property tested. 4.3 Expression of masses, volumes, factors and results Express masses in grams to the nearest 0,001 g and volumes from burettes in millilitres to the nearest 0,05 ml. Express the factors of solutions, given by the mean of three measurements, to three decimal places. Express the results, where a single test result has been obtained, as a percentage generally to two decimal places. Express the results, where two test results have been obtained, as the mean of the results, as a percentage generally to two decimal places. If the two test results differ by more than twice the standard deviation of repeatability, repeat the test and take the mean of the two closest test results. The results of all individual tests shall be recorded. 4.4 Blank determinations Carry out a blank determination without a sample, where relevant, following the same procedure and using the same amounts of reagents. Correct the results obtained for the analytical determination accordingly. 4.5 Reagents Use only reagents of analytical quality. References to water mean distilled or deionised water having an electrical conductivity ≤ 0,5 mS/m. Unless otherwise stated percent means percent by mass. For the concentrated liquids used to make up the reagents in this standard the densities (ρ) are given in grams per millilitre at 20 °C. The degree of dilution is always given as a volumetric sum, for example: dilute hydrochloric acid 1 + 2 means that one volume of concentrated hydrochloric acid is to be mixed with two volumes of water. The concentrations of reference and standard volumetric solutions are specified as amount-of-substance concentrations, c (mol/l). SIST EN 459-2:2010

EN 459-2:2010 (E) 8 4.6 Evaluation of test results 4.6.1 General The chemical requirements for building limes are specified in EN 459-1:2010, Tables 2, 9, 16, 20 and 24. 4.6.2 Test results for quicklime For quicklime the specified values correspond to the finished product. 4.6.3 Test results for all other types For all other types (hydrated lime, lime putty, milk of lime, lime with hydraulic properties) the values are based on the product after subtraction of its free water and bound water content. The values obtained by application of procedures described in this European Standard for total calcium oxide and magnesium oxide (5.2), magnesium oxide (5.2), sulfate (5.3) and carbon dioxide (5.5 or 5.6) are for the products without subtraction of the free water and bound water content. To compare these values with EN 459-1:2010, Tables 2 or 9, they shall first be corrected by multiplication by factor F. Factor F shall be determined in the following way: Determine the carbon dioxide content as described in 5.5 or 5.6 and the loss on ignition as described in 5.7. The loss on ignition is the sum of the free water, bound water and carbon dioxide, provided that the sample does not contain any highly volatile compounds or oxidizable constituents. Calculate the total (free + bound) water content WT as a mass fraction in percent of the sample using: WT = loss on ignition in % − carbon dioxide content in percent (1) Calculate the factor F from the following equation: F = 100/(100 – WT) (2) 4.6.4 Test results for available lime The values for available lime, obtained by the application of the procedure described in 5.8 correspond to either available CaO for quicklime or available Ca(OH)2 for all other types (hydrated lime, lime putty, milk of lime, lime with hydraulic properties). 5 Chemical analysis 5.1 Extraction with hydrochloric acid 5.1.1 General Extraction with hydrochloric acid is used to dissolve building lime in order to determine calcium oxide and magnesium oxide. 5.1.2 Principle The sample is boiled with hydrochloric acid and the solution filtered. The pH value is adjusted to 6 to 7 to precipitate the iron (III) and aluminium oxides. After refiltering, the filtrate is transferred to a suitable volumetric flask.

SIST EN 459-2:2010

EN 459-2:2010 (E) 9 5.1.3 Reagents 5.1.3.1 Hydrochloric acid, ρ (HCI) = 1,16 to 1,19 g/ml. 5.1.3.2 Hydrogen peroxide solution, c (H2O2) = 30 %. 5.1.3.3 Hydrogen peroxide solution, diluted, 1 + 9. 5.1.3.4 Ammonium hydroxide solution, c (NH4OH) = 25 %. 5.1.3.5 Ammonium hydroxide solution, diluted, 1 + 9. 5.1.3.6 Ammonium chloride, NH4Cl. 5.1.4 Apparatus 5.1.4.1 Ordinary laboratory equipment. 5.1.4.2 Hot plate. 5.1.4.3 Analytical balance accurate to 0,001 g. 5.1.4.4 Magnetic stirrer and magnetic rod, inert e.g. PTFE covered. 5.1.4.5 pH-meter with glass electrode, capable of measuring to an accuracy of 0,05. 5.1.5 Procedure Weigh (1 ± 0,1) g of the sample to the nearest 0,001 g (m1), transfer it to a 250 ml beaker, moisten with 10 ml of water, then gradually add 30 ml of hydrochloric acid (5.1.3.1). Make the solution up to about 100 ml with water then boil it for 10 min. After boiling, filter the solution immediately through a fluted filter paper (particle retention size 2,5 µm) into a 400 ml beaker and wash the residue well with hot water. Add about 4 g of ammonium chloride (5.1.3.6) and a few drops of hydrogen peroxide (5.1.3.3) to the solution, then dilute with about 150 ml of water and heat to boiling. During boiling, add ammonium hydroxide solution (5.1.3.4) to adjust the pH value to 6 to 7 and precipitate aluminium hydroxides and iron hydroxides and the soluble silicic acid. Continue boiling for 3 min and, after the precipitate has settled, filter the solution immediately through a fluted filter paper (particle retention size 2,5 µm) into a 500 ml volumetric flask. Wash the filter residue three times with ammonium hydroxide solution (5.1.3.5) and three times with water. After the solution has cooled to room temperature, make the solution up to the mark with water and shake the contents of the flask thoroughly. This solution (V1) is ready for further chemical analyses. 5.2 Calcium oxide (CaO) and magnesium oxide (MgO) 5.2.1 General The method is suitable for determining calcium oxide and magnesium oxide. 5.2.2 Principle Calcium oxide is first determined in an aliquot of the test solution by complexation titration with EDTA solution at a pH value of 13, the colour change of a calcium-specific indicator being used to indicate the end point. During the titration, the EDTA first reacts with the free calcium ions and then with the calcium ions bonded to the indicator, causing the colour of the latter to change sharply from wine red to blue. SIST EN 459-2:2010

EN 459-2:2010 (E) 10 In the same way, the total calcium oxide and magnesium oxide (Σ CaO + MgO) is determined at a pH value of 10 by titration with EDTA using Eriochrome Black T as indicator. During the titration, the EDTA first reacts with the free calcium and magnesium ions and then with those bonded to the indicator, causing the colour of the latter to change from red to blue. The difference in the amount-of-substance concentrations, c (CaO + MgO) and c (CaO), gives the magnesium content, c (MgO). 5.2.3 Reagents 5.2.3.1 Hydrochloric acid, ρ (HCI) = 1,16 g/ml to 1,19 g/ml. 5.2.3.2 Hydrochloric acid, diluted, 1 + 1. 5.2.3.3 Triethanolamine, c [N(C2H5OH)3] = 99 %. 5.2.3.4 Triethanolamine solution, diluted, 1 + 1. 5.2.3.5 Sodium hydroxide solution, c (NaOH) = 4 mol/l. 5.2.3.6 Ammonium hydroxide solution, c (NH4OH) = 25 %. 5.2.3.7 Ammonium chloride, NH4Cl.

5.2.3.8 Ethylenediaminetetra-acetic acid disodium salt dihydrate (EDTA), (C10H14N2Na2O8 ⋅ 2 H2O), dried to constant mass at 80 °C before weighing. 5.2.3.9 Calcium carbonate, c (CaCO3) = 99,9 % (dried at (200 ± 10) °C). 5.2.3.10 Buffer solution.

Make 70 g of ammonium chloride (5.2.3.7) and 570 ml of ammonium hydroxide solution (5.2.3.6) up to the mark with water in a 1 000 ml volumetric flask. 5.2.3.11 EDTA solution, c (EDTA) = 0,04 mol/l. a) Preparation: Dissolve 14,89 g of EDTA (5.2.3.8) in water and making up to 1 000 ml in a volumetric flask. b) Standardization: Pipette 50 ml of the calcium ion reference solution (5.2.3.12) into a 400 ml beaker and dilute with 100 ml of water. Adjust the pH value of the solution to (12,5 ± 0,5) with sodium hydroxide solution (5.2.3.5) using a pH meter. Add 0,1 g of calconcarboxylic indicator (5.2.3.13) and titrate with the EDTA solution being standardized until the colour changes to blue. The concentration of the EDTA solution is given by the following equation: 2222489,1204,009,10050VmVmc×=×××= (3) where m2 is the initial mass of calcium carbonate taken to prepare the calcium ion reference solution, in grams; V2 is the volume of the EDTA solution used in the titration, in millilitres. SIST EN 459-2:2010

EN 459-2:2010 (E) 11 5.2.3.12 Calcium ion reference solution, c (Ca2+) = 0,01 mol/l.

Transfer (1 ± 0,002) g of calcium carbonate (5.2.3.9) (m2) and about 100 ml of water to a 400 ml beaker, cover the beaker with a watch glass and carefully add about 10 ml of hydrochloric acid (5.2.3.2). After the calcium carbonate has dissolved completely, remove the carbon dioxide by boiling, then allow the solution to cool and make it up to 1 000 ml in a volumetric flask. 5.2.3.13 Calconcarboxylic acid indicator.

Grind 0,2 g of calconcarboxylic acid intensively with 20 g of anhydrous sodium sulfate in a mortar. 5.2.3.14 Eriochrome Black T indicator.

Grind 1 g of Eriochrome Black T intensively with 100 g of sodium chloride in a mortar. 5.2.4 Apparatus 5.2.4.1 Ordinary laboratory equipment. 5.2.4.2 Magnetic stirrer with magnetic rod. 5.2.4.3 pH-meter with glass electrode, capable of measuring to an accuracy of 0,05. 5.2.5 Procedure 5.2.5.1 Determination of CaO To determine the calcium oxide content, transfer 25 ml (V3) of the solution prepared in accordance with 5.1.5 to a 400 ml beaker, dilute the solution with about 150 ml of water and add 5 ml of triethanolamine solution (5.2.3.4). Adjust the pH value of this solution to (12,5 ± 0,5) with sodium hydroxide solution (5.2.3.5) using a pH-meter. Add 0,1 g of calconcarboxylic acid indicator (5.2.3.13) and titrate with the EDTA solution while stirring constantly with a magnetic stirrer until the colour changes from wine red to blue, record the volume (V4) of the EDTA solution added. During titration the pH-value shall not fall below 12,0. 5.2.5.2 Determination of total CaO and MgO content Transfer about 150 ml of water and 25 ml (V5) of the solution prepared in accordance with 5.1.5 to a 400 ml beaker. Add 5 ml of triethanolamine solution (5.2.3.4) and adjust the pH value of the solution to (10,5 ± 0,5) with buffer solution (5.2.3.10) using a pH-meter. Then add about 90 % of the volume of EDTA solution used during the calcium oxide titration (as described in 5.2.5.1) and, after adding 0,1 g of Eriochrome Black T indicator (5.2.3.14), titrate the solution until the colour changes from wine red to blue. Record the total volume (V6) of EDTA solution added. 5.2.6 Evaluation and expression of results The calcium oxide content of the sample expressed as CaO in mass fraction in percent is given by the following equation: 1341000110008,5604,0mVVcVCaO×××××××= (4) where V1 is the volume of the digestion solution (5.1.5), in millilitres; SIST EN 459-2:2010

EN 459-2:2010 (E) 12 V3 is the volume of the aliquot of the digestion solution V1 taken for titration as described in 5.2.5.1, in millilitres; V4 is the volume of EDTA solution used for the CaO determination as described in 5.2.5.1, in millilitres; c is the concentration of the EDTA solution, as determined in 5.2.3.11; m1 is the mass, in grams, of the test portion used in 5.1.5. The magnesium oxide content of the sample expressed as MgO in mass fraction in percent is given by the following equation: 154610001100)(311,4004,0MgOmVVVcV×××−××××= (5) where V1 is the volume of the digestion solution (5.1.5), in millilitres; V5 is the volume of the aliquot of the digestion solution V1 taken for titration as described in 5.2.5.2, in millilitres; V4 is the volume of EDTA solution used for the CaO determination as described in 5.2.5.1, in millilitres; V6 is the volume of EDTA solution used for the determination of the total CaO and MgO as described in 5.2.5.2, in millilitres; c is the concentration of the EDTA solution, as determined in 5.2.3.11; m1 is the mass, in grams, of the test portion used in 5.1.5. 5.3 Sulfate (expressed as SO3) 5.3.1 General The method is used to determine the sulfate content of building lime. 5.3.2 Principle The sulfate compounds in the sample are dissolved in hydrochloric acid and the pH value is adjusted to 1 to 1,5 to prevent precipitation of the oxides of iron and aluminium. The sulfate content is determined gravimetrically by boiling the solution and precipitating the sparingly soluble barium sulfate with a barium chloride solution. 5.3.3 Reagents 5.3.3.1 Hydrochloric acid, ρ (HCI) = 1,16 g/ml to 1,19 g/ml. 5.3.3.2 Hydrochloric acid, diluted, 1 + 1. 5.3.3.3 Hydrochloric acid, diluted, 1 + 50. 5.3.3.4 Nitric acid, ρ (HNO3) = 1,40 g/ml to 1,42 g/ml. 5.3.3.5 Ammonium hydroxide solution, c (NH4OH) = 25 %. SIST EN 459-2:2010

EN 459-2:2010 (E) 13 5.3.3.6 Ammonium hydroxide solution, diluted, 1 + 16. 5.3.3.7 Barium chloride, BaCl2 ⋅ 2H2O. 5.3.3.8 Barium chloride solution.

Dissolve 120 g of barium chloride in water and make up to 1 000 ml with water in a volumetric flask. 5.3.3.9 Silver nitrate, AgNO3. 5.3.3.10 Silver nitrate solution.

Dissolve 5 g of silver nitrate (5.3.3.9) in water, add 10 ml of nitric acid (5.3.3.4) and making up to 1 000 ml with water in a volumetric flask. 5.3.4 Apparatus 5.3.4.1 Ordinary laboratory equipment. 5.3.4.2 Analytical balance, accurate to 0,001 g. 5.3.4.3 Hot plate or sand bath. 5.3.4.4 Muffle furnace. 5.3.5 Procedure Weigh out (1 ± 0,1)

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