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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The faster, easier way to work with standards. For lightweight aggregate, use g of cement for each mortar mix and 30 g for each preliminary test. Weigh each bottle and record its mass to the nearest 1 g. Mature, filter and ignite the barium sulfate precipitate as specified in NOTE Zinc chloride solution is moderately irritating to skin and mucous membranes.
For this reason a d-range around the above mentioned intensities sn be scanned.
Preparation of test portion Reduce eh laboratory sample by the procedures specified in ENto an amount not less than 25 g. Thank you for interesting in our services.
For fine aggregates use two bottles of 2 l capacity 5. Cool and add the silver nitrate solution. Add ten drops of m-nitrophenol solution 4.
Then pour some of the test portion into the glass bottle until the height of aggregate and solution is mm. If this happens, repeat the test by boiling the solution for 5 min on a hot plate 5.
Leave the solution to cool to room temperature and store in a glass bottle 5. Make sure that calibration measurements and analyses are performed under identical operational conditions and same d-values for intensities and sb. 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.
BS EN +A – Tests for chemical properties of aggregates. Chemical analysis
Record the stiffening times of the duplicate test portions of unheated and heated control aggregates. This phenomenon is sometimes improperly called “lime disintegration”.
The sb of turbidity in the silver nitrate test confirms that the washings are free from chloride ions. Check the washings to ensure the absence of chloride ions using the silver nitrate test 6.
BS EN 1744-1:2009+A1:2012
This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by Mayand conflicting national standards shall be withdrawn at the latest by May Sampling The laboratory sample shall be taken in accordance with the procedures specified in 17744-1 X is the average of the test results.
Determination of workable life and correction time of fresh mortar ENMethods of test for mortar for masonry — Part Mix the contents of the cylinder using a glass stirring rod 5. Distribute the glass beads evenly within the test cylinder so that they give a level surface. Determine the end point of titration bss using the photoelectric titration equipment 5.
The sulfides are converted into fn sulfide, which is carried over by a gaseous stream into an ammoniacal solution of zinc sulfate. Composition, specifications and conformity criteria for common cements This page deliberately set blank Licensed to Mr Ns Calvar on 26 May Add 2 ml of 3,5,5-trimethylhexanol 4.
The content of calcium ions in the extract is subsequently determined by complexometric titration.
Add to each bottle a mass of water equal to twice the mass of the test specimen. Repeat the procedure above boil, precipitate, filter and wash and reject the precipitate if any. Take the indicated quantity of distilled or demineralized water using a pipette and pour it into a test tube. Apparatus for general purposes 5.
NOTE 1 The unheated test aggregate should have similar moisture content to the heated control aggregate when it was weighed before heating. Transfer the test specimens 7. The proportions of mass for the individual grain size classes are given in Table 2. NOTE If the titration is conducted by means of a recording pH meter, the filtration of the extract is not necessary. If no pieces disintegrate or crack, the sample shall be regarded as having passed the test.
Filter as much of the supernatant liquid as is practical on a pre-weighed medium-grade filter paper 5. Allow the crucible and its contents to cool to the room temperature in a desiccator. Thoroughly wash the contents of the filter with hot demineralized water.
The test is accelerated due to the elevated temperature and is designed to generate measurable values of expansion for the purpose of categorizing suitable slag. This is established by dissolving known quantities of calcined CaO in ethanediol and measuring the conductance of their solutions.