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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NOTE 1 The unheated test aggregate should have similar moisture content to the heated control aggregate when it was weighed before heating. Unless otherwise stated, all volumetric glassware shall be of class B accuracy as defined in ISO Disperse the mixture in 50 ml of demineralized water. Weigh the basin and aggregate and record the loss in mass. Fix to the flask the ground neck supporting the separating funnel and connect this neck to the inlet of the condenser; connect the outlet of the condenser to the glass tube which dips into the beaker containing 15 ml of ammoniacal zinc sulfate solution 4.
The holes in the base allow steam to rise through the specimen evenly. Barium chloride is then added to the extract, buffered at neutral pH, so that sulfate ions precipitate as barium sulfate. Boil the solution to expel carbon dioxide, cover and cool to room temperature and dilute to 1 l with water in a volumetric flask 5.
Get permission to copy from or network this publication www. Cool and add the silver nitrate solution. This means that the trial mixes and mortar test specimens made with the test aggregate should be prepared on the same day as the heating procedure This reaction should be complete within 30 min and indicates the presence of rapidly reacting iron sulfide.
It shall have a mass of at least 3 g. The chloride content of the solution is indicated by the consumption of silver nitrate solution relative to the point of inflection of the potential curve, the quantity of sodium chloride 4. As the movements at the beginning of the steam test occur sharply, it is recommended that the movements be read off at intervals of 15 min. In order not to register the lifting movements associated with this, do not begin recording the displacement until steam is passing freely through the sample.
Make the solution alkaline by adding ammonium hydroxide 4. NOTE A negative result indicates that organic contaminators accelerated the setting of the mortar.
See publications covering the same Subject Area 2. Preliminary treatment of test portions This is established by dissolving known quantities of calcium sulfate in hot water and measuring the absorbance of the test solutions.
BS EN 1744-1:2009+A1:2012
In such cases volumes delivered from measuring cylinders and indicated masses using the ordinary balances specified in 5. ENEN Free to use BIM project management tool provides step-by-step help to define, manage and validate responsibility for information development and delivery at each stage of the asset life cycle in level 2 BIM projects.
For em aggregate use two bottles of 5 l capacity 5. In other cases, embed vs recovered particles in Portland cement paste, 7144-1 for 28 days in a moist condition and then examine the cement paste for staining. Above the heating chamber is the compressed slag specimen in a cylinder with a perforated base, an internal diameter of about mm and a height of about mm. The aspect and colour of fluorescence enable the detection of slags e to silicate disintegration.
Ensure that none of the heavier aggregate particles pass into the sieve. The chloride ion concentration may also be determined using instrumental methods based on conductivity. A bottle of a different size can affect the comparison with the standard colour.
Aggregates, Chemical properties, Cement bd concrete technology, Chemical analysis and testing, Quantitative analysis, Determination of content, Chlorides, Sulfur, Sulfides, Sulfates, Contaminants, Humus, Solubility, Lime, Slags, Steels, Dimensional changes, Deformation, Expansion deformationSurface properties, Iron inorganic compounds, Residue-on-ignition determination, Solubility test methods, Blast-furnace slag aggregates, Volumetric analysis, Potentiometric methods, Precipitation methods, Test specimens, Specimen preparation, Test equipment, Reproducibility, Mathematical calculations.
Each individual test portion shall be combined separately with the eb size distribution. Each mineral is characterized by a set of specific d-values and corresponding intensity ratios. Electrode -1 constant 0, cm. Leave the solution to cool to room temperature and store in a glass bottle 5.
BS EN +A – Tests for chemical properties of aggregates. Chemical analysis
NOTE Drying at a higher temperature will oxidise any vs. NOTE 1 The free lime content is obtained from the measured conductance using a calibration graph.
Remove from the source of heat and, while stirring, sprinkle the test portion on to the acid solution. Accept and continue Learn more about the cookies we use and how to change your settings.
Calculate the mass of aggregate in each bottle by difference. Wash the contents of the filter at least 3 times with a little hot, demineralised water, reserve the filtrates and reject the precipitate if any. The sulfides are converted into hydrogen sulfide, which is carried over by a gaseous stream into an ammoniacal solution of zinc sulfate.
NOTE If the titration is conducted by means of a recording pH meter, the filtration of the extract is not necessary. Determination of flexural and compressive strength of hardened mortar ENTests for mechanical and physical properties of aggregates — Part 6: The absence of turbidity in the silver nitrate test confirms that the washings are free from chloride ions.
Fulvo acids are components of the humic acids which have a retarding effect on the hydration of cements. When a test portion of the fine aggregate is immersed in a liquid with a density just below 2,0, lower density particles will float on the surface.
The parts should be weighed, heated and reweighed separately; and recombined when cool. After 4 h the interval can be extended to 60 min.
Cover the buffered solution in beaker B and the retained solution in beaker C with a watch glass. The method of analysis of the extract is based on that of Volhard titration where an excess of silver nitrate solution is added to the chloride solution and the unreacted portion is back titrated with a standardized solution of thiocyanate, using ammonium iron III sulfate solution as an indicator.