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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If the precipitate is filtered through a filter paper, transfer the filter paper and precipitate to a previously ignited and weighed crucible 5. Pipette 20 ml of the standard potassium iodate solution into a ml conical flask and dilute with approximately ml of water. 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. Then add 2 ml of starch solution 4.

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Carefully loosen the stopper, avoiding loss of solution and rinse the stopper with water, collecting the washings in the solution. Cool the crucible in a desiccator 5. NOTE 1 If the aggregate contains non-volatile oxidizable constituents, as in the case of blast-furnace slags, the loss on ignition should be corrected in accordance with EN Get permission to copy from or network this publication www.

The stiffening test assesses acceleration or retardation of the setting of the mortar, while the day strength indicates any longer term effect. This solution needs to be standardized against a solution of known calcium content 4. Take the smart route to manage medical device compliance.

For dated references, only the edition cited applies. NOTE 1 A blue-green gelatinous precipitate of ferrous sulfate should form within 5 min.

ne Record the total volume V5 of silver nitrate solution added. Then this sub-sample shall be prepared in accordance with the requirements of the X-ray device. Recognised values for some of the test methods are given in Annex A informative. NOTE Drying at a higher temperature will oxidise any sulfides.

BS EN 1744-1:2009+A1:2012

We need your help to maintenance this website. Cool and add the silver nitrate solution. Allow the crucible and its contents to cool to the room temperature in a desiccator.

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The absorbance of the blank solution should always be established and deducted from the test solution. For the purpose of type testing and in cases of dispute only the reference method should be used.

BS EN +A – Tests for chemical properties of aggregates. Chemical analysis

Using the water-cement ratio obtained using the trial mixes in The individual grain size classes shall be taken from the crushed aggregates. Discard the residue and continue as below. X-ray diffraction can be understood as reflection of X-rays by the different sets of lattice planes.

NOTE With some aggregates, e. If no pieces disintegrate or crack, the sample shall be regarded as having passed the test.

NOTE The solution should be stable for at least two weeks. Add the test portion to this solvent and introduce the measuring electrode. NOTE A statement on the precision of the determination of water-soluble chlorides by potentiometry is given in Annex A.

Add sufficient silver nitrate to ensure a titre bd at least 3 ml of thiocyanate solution.

In the case of lightweight aggregates, the two test portions shall each have a volume of about 1 l. NOTE 2 15 min at the higher temperature should suffice. The diffracted intensity by free lime CaO is measured for each of the samples in accordance with Cool the basin and then weigh the lightweight particles m10to the nearest 0,1 g.

The extract is then analysed by the method based on Mohr. Ignite the precipitate for at least 1 h at the stated temperature. Slags with a uniform shine in various shades of violet and those exhibiting bright spots in a limited number only and uniformly distributed, shall be deemed sound.

The content of calcium ions in the extract is subsequently determined by conductance measurements. Apparatus for general purposes 5. Vary the water content successively and measure the consistence of each trial mix until the correct value of consistence is attained.

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.

We need your help! See publications covering the same Subject Area 2. Transfer the test portion into the bottles. To each flask, add a mass of water equal fifty times the mass of the test specimen. Determine the end point of titration by using the photoelectric titration equipment 5. Record the 12 compressive strengths for the duplicate test portions of unheated and heated control aggregates. Weigh the dried test portion to the nearest 0,1 g m The standards should cover the range of sulfur content expected.

NOTE 2 Ready for use solutions may be used as an alternative. Unless otherwise stated, the test methods specified in this standard may be used for factory production control, for audit tests or for type tests.

Sieving method BS EN