BS EN 1744-1 PDF
BS EN +A Licensed to Mr George Calvar on 26 May 1 user personal license only. Copying, copy/pasting, storage & distribution or use. BS EN BS EN , incorporating amendment no. 1. BS EN +A, incorporating Corrigendum May BS EN . Specifies reference procedures, and in certain cases an alternative method, for the chemical analysis of aggregates. Document History. Supersedes BS EN.
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If necessary, the method can be adapted for use on coarse aggregates by examining larger test portions see Table 1. Express the factors of solutions 4. Determination of particle density and water absorption ISO If a white precipitate forms, filter through a medium 174-41 filter paper and wash thoroughly with hot distilled water.
NOTE If mechanical agitation equipment is not used and the aggregate and water are merely left in contact with occasional shaking there is a possibility particularly if the source of sulfate is, for example, large crystals of gypsum that all of the soluble sulfate will not be extracted in 24 h.
BeMethods of testing cement — Part 1: While stirring vigorously and maintaining the solution at boiling point, add drop-by-drop 5 ml of the barium chloride solution 4. After extraction, the recovered aggregate is dried and weighed. If necessary, continue washing. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained.
Check that the extraction is complete by bubbling the outlet into fresh ammoniacal zinc sulfate solution.
BS EN +A – Tests for chemical properties of aggregates. Chemical analysis
Vigorously 1744-11 the be tube again for 10 s to put any crystals of BaSO4 deposited on the base of the test tube into suspension. Use IC for all further calculations. The content of calcium ions in the extract is subsequently determined by complexometric titration.
Any sulfates are precipitated as 1744-1 sulfate BaSO4 and weighed. The content of calcium ions in the extract is subsequently determined by conductance measurements. Each mineral is characterized by a set of specific d-values and corresponding intensity ratios. If after adding the stannous chloride the solution becomes turbid, sulfides are present.
In the event of a reliable method being developed, the types should be redefined in terms of free MgO content. Transfer the test specimens to the flasks, weigh the two flasks and contents and record their mass to the nearest 0,01 g. Test methods for other properties of aggregates are covered by the following European Standards: Continue boiling for 15 min so that a precipitate is properly formed. Check for the absence of turbidity or precipitate in the solution.
Please copy and paste this embed script to where you want to embed Embed Script. NOTE The bottles should be approximately 5 l capacity when testing coarse aggregates or lightweight aggregates; approximately 2 l capacity when testing fine aggregates; and ml Erlenmeyer flasks for testing filler. For lightweight aggregate use two bottles of 5 l capacity 5. NOTE The value of factor k for the solution should be calculated using the mean value of three determinations, expressed to three decimal places.
BS EN 1744-1:2009+A1:2012
It supersedes BS EN It shall have a mass of at least 3 g. When aggregates containing sulfides e. Get permission to copy from or network this publication www. Bz maintaining the solution at boiling point and stirring vigorously, slowly add 40 ml of the barium chloride solution 4. Make sure that calibration measurements and analyses are performed under identical operational conditions and same d-values for intensities and background.
Licensed to Mr George Calvar on 26 May Note the volume of thiocyanate solution added. NOTE If only a small furnace is available, each test portion can be divided into two or more parts.
Barium chloride is then added to the extract, buffered at neutral pH, so that sulfate ions precipitate as barium sulfate.
Sampling, preparation of test specimens and extracts Follow the procedures specified in 7. NOTE 2 15 min at the higher temperature should suffice. You may experience issues viewing this site in Internet Explorer 9, 10 or Pour about 1 144-1 of the solution of zinc chloride 4.
Ensure that dn of the heavier aggregate particles pass into the sieve. The sulfides are converted into hydrogen sulfide, which is carried over by a gaseous stream into an ammoniacal solution of zinc sulfate. Complete this part of the procedure within 60 s. NOTE By measuring the conductance during extraction time, the dissolution of the free lime can be monitored directly. Stop the flow of gas.
The proportions of mass for the individual grain size classes are given in Table 2. Cover the perforated base of the test cylinder with a circular filter fabric mat and, using a laboratory scoop, transfer the prepared test portion to the cylinder 5. Common equipment and calibration ENTests for general properties of aggregates — Part 6: The watersoluble sulfate content is determined by precipitation at pH between 1 and 1,5 by a solution of barium chloride, at the boiling point.
NOTE 1 If the aggregate contains sulfides, e.