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 Organic contaminators can entrain air in mortar mixes. Place ml water and 40 ml of concentrated hydrochloric acid 4. Carefully loosen the stopper, 174-1 loss of solution and rinse the stopper with water, collecting the washings in the solution.
The total sulfur content is obtained directly from the readout of the apparatus. Remove the hot plate, allow to cool, then filter under vacuum through the glass microfibre filter 5. Wash the first flask and residue ba 50 ml of 2-methylpropan-l-ol 4.
Determination of particle density and water absorption ISO NOTE 2 1,5 g of silicone oil is sufficient for rn batch of 1,5 kg of beads. Preliminary treatment of test portions Volumetric glassware of class A accuracy shall be used for audit tests and for type wn. 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.
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.
NOTE 1 If the aggregate contains sulfides, e. After 4 h 17444-1 interval can be extended to 60 min. After switching on the heating jacket and the steam unit, the slag test specimen then starts heating up with an expansion of its volume. Using the water-cement ratio obtained using the trial mixes in NOTE 3 Unless otherwise stated reagent solutions may be assumed to have long-term stability.
This solution needs to be standardized against a solution of known calcium content 4. Acidify with nitric acid HNO3 4. Select measuring times for each background left and right of the peaks and the d-ranges be ensure statistic save analytical results.
Calculate the wn of dried aggregate by subtracting the masses of the basin and the mass of the filter paper m Compliance with a British Standard cannot confer immunity from legal obligations.
The temperature of ignition used shall be reported. Click to learn more. The method estimates substances such as lignite and coal which may cause staining or pop-outs on concrete or mortar surfaces.
For lightweight aggregate add 1 l of water. Transfer the test specimens 7. Cool the crucible to room temperature in a desiccator 5. Fasten the watertight bottle closures and mix the contents by shaking at least 20 times. For the purpose of type testing and in cases of dispute only the reference method should be used. This phenomenon is sometimes improperly called “lime disintegration”.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. Calculate the mass of filler in each flask by difference m NOTE Zinc chloride solution is moderately irritating to skin and mucous membranes.
Add 4 ml to 6 ml of the potassium chromate solution 4. These sets are listed in literature, i. NOTE The solution should be stable for at least two weeks. NOTE 1 The unheated test aggregate should have similar moisture content to the heated bbs aggregate when it was weighed before heating. If further particles float on the solution, decant through the sieve again.
BS EN +A – Tests for chemical properties of aggregates. Chemical analysis
By this means, the necessary moisture for reaction with the free lime and free magnesium oxide is continuously conveyed to the test specimen. Take the indicated quantity of buffered solution from beaker B using a pipette and pour it into a suitable test tube. Repeat the procedure above boil, precipitate, filter and wash and reject the precipitate if any. Titrate with sodium thiosulfate solution 4.
Finally, cover over the surface of the slag specimen with a circular filter fabric mat and then with a layer of glass beads 5. Use a pipette to transfer 1474-1 ml of buffered solution from beaker B to another beaker marked as “D”. This standard forms part of a series of tests for chemical properties of aggregates.
Each mortar mix shall also contain CEM I cement of mass one quarter that of the eb mass in the mix. The faster, easier way to work with standards. The extract is then analysed by the method based on Mohr.
BS EN 1744-1:2009+A1:2012
If necessary, the method can be adapted for use on coarse aggregates by examining larger test portions see Table 1. Leave to stand for at least 24 h and filter through a medium grade filter paper.
When sb containing sulfides e. EN all partsTests for general properties of aggregates EN all partsTests for geometrical properties of aggregates EN all partsTests for mechanical and physical properties of aggregates EN all partsTests for thermal and weathering properties of aggregates The other parts of ENTests for chemical properties of aggregates, are: If the difference between two determinations is more than twice the repeatability standard deviation, repeat the test and take the mean of the two closest values.