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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Leave it to stand for 24 h. Users of British Standards and PASs should make sure that they possess the latest amendments or editions.
Determination of workable life and correction time of fresh mortar ENMethods of test for mortar for masonry — Part Dilute to ml with water and add 10 ml of hydrochloric acid solution 4. The concentration of Ca ions is analysed and expressed as CaO, i.
NOTE The approximate dimensions are intended to match a 174-41 that is commercially available. Gently agitate the bed of aggregate with a glass rod to assist lightweight particles to leave the bed and rise to the surface of the solution. The total sulfur content is obtained directly from the readout of the apparatus.
A blank value shall always be determined from the ethanediol and the reagents. Subject to Clause 1. The chloride ion concentration may also be determined using instrumental methods based on conductivity.
BS EN +A – Tests for chemical properties of aggregates. Chemical analysis
In this case, the method does not give a definitive conclusion. Standardize the solution at weekly intervals, or before use if the tests are less frequent. The amount of sodium ba added shall be confirmed by a blank test. Note the volume V8 of the silver nitrate solution used. Disperse the mixture in 50 ml of demineralized water.
Prepare each mix using the procedure in NOTE Drying at a higher temperature will oxidise any sulfides. Gs read off the final conductance value. If the pH value becomes too acid below 6add a little of the retained extract from beaker C to return it to neutrality.
BS EN 1744-1:2009+A1:2012
Transfer the test specimens to the flasks, weigh the two flasks and contents and record their mass to the 17441- 0,01 g. Filter the residue through a medium filter paper into a ml beaker.
NOTE Organic contaminators can entrain air in mortar mixes. NOTE With some aggregates, e. Reject the trial mixes. Weigh two ml Erlenmeyer flasks 5. After the indicated resting time for the apparatus, record the result as C0. Document Status Indicators The Green document status indicator indicates that the document is: Calculate the mass of dried aggregate by subtracting the masses of the basin and the mass of the filter paper m NOTE 1 A blue-green gelatinous precipitate of ferrous sulfate should form within 5 min.
Test methods ENTests for general properties of aggregates — Part 1: A bd of organizations represented on this subcommittee can be obtained on request to its secretary. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. To each flask, add a mass of water equal fifty times the mass of the test specimen. Add the filter paper and the retained particles to the aggregate in the basin. A strong colour reaction will usually reflect high humus content, but can be due to other factors.
Above the heating chamber is the compressed slag specimen in a cylinder with a perforated base, an internal diameter of about mm and a height of about mm. Remove the hot plate, allow to cool, then filter under vacuum through the glass microfibre filter 5. Any change in the volume caused by this reaction is read off from a displacement indicator directly at the top of the specimen.
By means of the potentiometric device 5.
Methods for sampling ENTests for general properties of aggregates — Part 2: As lime is deposited on the glass beads during the steam test, it is furthermore necessary to clean off the lime after every fourth steam test with dilute 174-41 acid.
Methods for reducing laboratory samples ENTests for general properties of aggregates — Part 5: 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.
Ignite the precipitate for at least 1 h at the stated temperature. It presents the UK view on standards in Europe and at the international level. Aggregates of higher sulfide content will require more than 10 min reaction time for complete transformation of all sulfides to precipitated zinc sulfide.
The holes in gs base allow steam to rise through the specimen evenly. Fasten the watertight bottle closures and mix the contents by shaking at least 20 times.
Check that the extraction is complete by bubbling the outlet into fresh ammoniacal zinc sulfate solution.