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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Test laboratories can determine the time required to achieve constant mass for specific types and sizes of sample dependent upon the drying capacity of the oven used. Adjust the volume to about ml with demineralized water and warm up the content of the beaker to below the boiling point. Calculate VC and VA from height measurements with the sounding rod 5. Add 4 ml to 6 ml of the potassium chromate solution 4.
Learn more about the cookies we use and how to change your settings. Pipette 20 ml of the standard potassium iodate solution into a ml conical flask and dilute with approximately ml of water. Take the indicated quantity of distilled or demineralized water using a pipette and pour it into a test tube. The sulfur content is expressed as a percentage by mass of the aggregate.
BS EN 1744-1:2009+A1:2012
Make the solution alkaline by adding ammonium hydroxide solution 4. To distinguish between these two forms of lime, extra tests are necessary, such as thermo gravimetric or X-ray diffraction analysis.
Disconnect the outlet tube, which will serve as a stirrer during the titration. Take approximately 1 g of this material as the test portion.
Leave the crucible in the furnace for at least 60 min. Cover the buffered solution in beaker B and the retained solution in beaker C with a watch glass.
Add several drops of concentrated ne acid 4. Use a 10 ml graduated cylinder 5. 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.
After extraction, the recovered filler is dried and weighed. The start and finish of text introduced or altered by amendment is indicated in the text by tags. Repeat the procedure with the extract from the second test specimen. The content of calcium ions in the extract is subsequently determined by conductance measurements. Cool the crucible in a desiccator 5. For eb aggregate use two bottles of 5 l capacity 5.
Stopper the bottle and shake it vigorously for 1 min. Transfer hs settled aggregate from the extraction bottle, with the aid of a minimum amount of water, to a pre-weighed porcelain evaporating basin 5. The method estimates substances such as lignite and coal which may cause 17441 or pop-outs on concrete or mortar surfaces.
Alternatively, the sample can be compacted by any other method capable of achieving the same degree of compaction, such as a Proctor hammer or a hand-held power hammer. Flakiness index BS EN After compaction, determine sb volume of the slag specimen VS, which is the difference between the volume of the cylinder VC and the volume of air VA between the slag specimen and the top edge of the cylinder.
Dilute to ml with water and add 10 ml of hydrochloric acid solution 4. Determine the end point of titration by using the photoelectric titration equipment 5. 7144-1 extraction, the recovered aggregate is dried and weighed.
BS EN +A – Tests for chemical properties of aggregates. Chemical analysis
The intensity of the colour increases as the concentration of fulvo acids increases. The parts should be weighed, heated and reweighed separately; and recombined when cool. NOTE If the titration is conducted by means of a recording pH meter, the filtration of the extract is not necessary. Allow the flask and its contents to stand for 4 h, shaking it occasionally. NOTE The steam equipment consists of one or more chambers, in which water is heated up to boiling point over heating elements during the test.
Extract the free lime and titrate in accordance with Continue mixing and add the water during the next 30 s. Adjust the displacement indicator vertically in bd centre of the perforated plate and fix it to a rigid support on the steam unit.
Cool the basin and then weigh the lightweight particles m10to the nearest 0,1 g. Add 5 ml of nitric acid 4. Methods for sampling ENTests for general properties of aggregates — Part 2: Prepare each mix using the procedure in Each mortar mix shall also contain CEM I cement 1474-1 mass one quarter ne of the aggregate mass in the mix.
NOTE Drying at a higher temperature will oxidise any sulfides. For lightweight aggregate, use g of cement for each mortar mix and 30 g for each preliminary test.