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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Apparatus for general purposes 5.
A blank value shall always be determined from the ethanediol and the reagents. The Amber document status indicator indicates that some caution is needed when using this document – it is either: Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.
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NOTE Organic contaminators can entrain air in mortar mixes. Distribute the glass beads evenly within the test cylinder so that they give a level surface.
Thank you for interesting in our services. After drying, the absence of free lime is confirmed by 144-1 between the analysis of the hydrated samples and the calibration curve of free lime.
BS EN 1744-1:2009+A1:2012
The content of calcium ions in the extract is subsequently determined by complexometric titration. Dry and then cool the contents of the basin to constant mass 3. NOTE Zinc chloride solution is moderately irritating to skin and mucous membranes.
This converts any sulfur compounds present into sulfur dioxide which is quantified by infrared detectors. After an extraction time of at least 10 min and when no further change in conductance occurs, the extraction process is completed. Use ICH for all further calculations. The intensity of the colour depends on the humus content. For this reason a d-range around the above mentioned intensities shall be scanned. Wash the filter and its contents with several ml of water and collect this in a test tube.
Add by pipette 5 ml of sodium chloride solution 4. For dated references, only the edition cited applies. Make the solution alkaline by adding ammonium hydroxide solution 4. Crush any oversize particles to pass the sieve, avoiding excessive grinding. The chloride is titrated with silver nitrate using potassium chromate as an indicator.
Mix the contents of the cylinder using a glass stirring rod 5.
They are prepared by pipetting ml of the solutions 4. Their committees work with the manufacturing and service industries, government, businesses and consumers to facilitate the production of British, European and International standards.
In other cases, embed the recovered particles in Portland cement paste, store for 28 days in a moist condition and then examine the cement paste for staining.
Cover the beaker with a watch glass 5. 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. Table 1 — Minimum mass of preliminary sub-sample Upper D sieve size of the aggregate, mm 7. 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.
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 ne solution 4.
Click here to find out 174-1 to access this document. If necessary, the method can be adapted for use on coarse aggregates by examining larger test portions see Table 1.
BS EN +A – Tests for chemical properties of aggregates. Chemical analysis
Contact with water shall be avoided. NOTE The solution should be stable for at least two weeks. Record the stiffening times of the duplicate test portions of unheated and heated control aggregates. Allow the crucible and its contents to cool to the room temperature in a desiccator. For factory production control purposes, it is possible to shorten the test duration by calculating the end point value using regression.
The content of calcium ions in the extract is subsequently determined by conductance measurements. Figure 3 — Example of a calibration graph 5.
Using the water-cement ratio obtained using the trial mixes in Check the pH value of the solution using pH meter 5. Discard the residue and continue as below. Click on the red box above to activate the Licence Agreement scroll bar.