EN 1744-1:2009

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Prüfverfahren für chemische Eigenschaften von Gesteinskörnungen - Teil 1: Chemische AnalyseEssais pour déterminer les propriétés chimiques des granulats - Partie 1: Analyse chimiqueTests for chemical properties of aggregates - Part 1: Chemical analysis91.100.15Mineralni materiali in izdelkiMineral materials and products71.040.40Kemijska analizaChemical analysisICS:Ta slovenski standard je istoveten z:EN 1744-1:2009SIST EN 1744-1:2010en,fr,de01-februar-2010SIST EN 1744-1:2010SLOVENSKI
STANDARDSIST EN 1744-1:19991DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1744-1
November 2009 ICS 91.100.15 Supersedes EN 1744-1:1998English Version
Tests for chemical properties of aggregates - Part 1: Chemical analysis
Essais pour déterminer les propriétés chimiques des granulats - Partie 1 : Analyse chimique
Prüfverfahren für chemische Eigenschaften von Gesteinskörnungen - Teil 1: Chemische Analyse This European Standard was approved by CEN on 17 October 2009.
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.
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Precision . 60A.1 Symbols . 60A.2 Determination of water-soluble chloride salts using the Volhard method (Reference method) (See Clause 7) . 60A.3 Determination of water-soluble chloride salts by potentiometry (Alternative method) (See Clause 8) . 60A.4 Determination of water-soluble sulfates in recycled aggregate (See 10.2) . 60A.5 Determination of total sulfur content by acid digestion (Reference method) (See 11.1) . 60A.6 Determination of acid soluble sulfates (See Clause 12) . 61Bibliography . 62 SIST EN 1744-1:2010

EN 932-1, Tests for general properties of aggregates — Part 1: Methods for sampling EN 932-2, Tests for general properties of aggregates — Part 2: Methods for reducing laboratory samples EN 932-5, Tests for general properties of aggregates — Part 5: Common equipment and calibration EN 932-6, Tests for general properties of aggregates — Part 6: Definitions of repeatability and reproducibility EN 933-2, Tests for geometrical properties of aggregates — Part 2: Determination of particle size distribution — Test sieves, nominal size of apertures EN 1015-4, Methods of test for mortar for masonry — Part 4: Determination of consistence of fresh mortar (by plunger penetration) EN 1015-9, Methods of test for mortar for masonry — Part 9: Determination of workable life and correction time of fresh mortar EN 1015-11, Methods of test for mortar for masonry — Part 11: Determination of flexural and compressive strength of hardened mortar EN 1097-6, Tests for mechanical and physical properties of aggregates — Part 6: Determination of particle density and water absorption ISO 384:1978, Laboratory glassware — Principles of design and construction of volumetric glassware ISO 385, Laboratory glassware — Burettes SIST EN 1744-1:2010

NOTE 3 Unless otherwise stated reagent solutions may be assumed to have long-term stability. NOTE 4 All chemicals should be treated as potential poisons with toxic properties and appropriate precautions taken before their use. Always take time to assess possible hazards before starting any procedures and constant attention should be maintained. SIST EN 1744-1:2010

(16,987 ± 0,001) g of the dried silver nitrate, dissolving in water and diluting to 1 l in a volumetric flask (5.3.6). Store the solution in the amber-coloured glass reagent bottle (5.2.14) and protect from prolonged exposure to sunlight. 4.2.2 Thiocyanate (KSCN or NH4SCN) solution, approximately 0,1 mol/l, prepared by dissolving 9,7 g of potassium thiocyanate or 7,6 g ammonium thiocyanate in water and diluting to 1 l in a volumetric flask. Pipette 25 ml of silver nitrate solution (4.2.1) into a conical flask (5.3.5) and add 5 ml of nitric acid (4.2.3) and 1 ml of ammonium iron (III) sulfate indicator solution (4.2.5). Add the thiocyanate solution from a burette (5.2.13) until the first permanent colour change occurs, that is from white opalescence to pale brown. Note the volume of thiocyanate solution added. Calculate the concentration of the thiocyanate solution cT, (in mol/l), from the following equation: cT
=
2,5/V1 (1) where V1 is the volume of thiocyanate added (in ml). Standardize the solution at weekly intervals, or before use if the tests are less frequent. 4.2.3 Nitric acid (HNO3), approximately 6 mol/l, prepared by adding 100 ml of nitric acid (4.1) to 150 ml water, boiling the diluted acid in a fume cupboard (5.2.17) until it is colourless and leave to cool to room temperature. 4.2.4 Chloride free technical grade 3,5-trimethylhexan-1-ol. 4.2.5 Ammonium iron (III) sulfate NH4Fe(SO4)2.12H2O indicator solution, prepared by adding 60 g of water to 50 g ammonium iron (III) sulfate, warming to dissolve, and adding 10 ml nitric acid (4.2.3). Leave the solution to cool to room temperature and store in a glass bottle (5.2.15). SIST EN 1744-1:2010

4.6.1 Hydrogen peroxide (H2O2), 30 % concentration. 4.6.2 Indicator methyl red (dissolve 20 mg methyl red powder in 50 ml of ethanol, then add 50 ml of water). 4.7 Reagents for determination of acid soluble sulfide content (Clause 13) 4.7.1 Lead acetate solution, made by dissolving approximately 0,2 g of lead acetate (Pb(CH3COO)2.3H2O) in water and making up to 100 ml. 4.7.2 Ammoniacal zinc sulfate solution, made by dissolving 50 g of zinc sulfate (ZnSO4.7H2O) in 150 ml water and add 350 ml of concentrated ammonium hydroxide (NH4OH). Leave to stand for at least 24 h and filter through a medium grade filter paper. 4.7.3 Tin (II) chloride (SnCl2.2H2O). 4.7.4 Metallic chromium (Cr), in powder form. 4.7.5 Standard potassium iodate solution containing 0,016 7 mol/l, made by dissolving successively in freshly boiled and cooled water in a 1 l volumetric flask, (3,6 ± 0,1) g to the nearest 0,1 mg (6.3) of potassium iodate (KIO3) dried at (110 ± 5) °C, two pellets (about 0,4 g) of sodium hydroxide (NaOH) and 25 g of potassium iodide (KI). Make up to the mark with freshly boiled and cooled water. NOTE 1 A trace of sodium hydroxide will help to stabilize this solution. The solution should be discarded when it becomes discoloured. The factor F of this solution is calculated from the following equation: 8566,3mF1= (2) SIST EN 1744-1:2010

is the mass of the portion of potassium iodate in g. NOTE 2 The value of factor F for the solution should be calculated using the mean value of three determinations, expressed to three decimal places.
NOTE 3 If the sulfide content is less than 0,1 % by mass, solutions ten times less concentrated should be used. They are prepared by pipetting 100 ml of the solutions (4.7.5 and 4.7.6) into 1 l volumetric flasks and making up to the mark with water. 4.7.6 Sodium thiosulfate solution approximately 0,1 mol/l, made by dissolving 24,82 g of sodium thiosulfate (Na2S2O3.5H2O
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