EN 12697-1-2020 pdf download.Bituminous mixtures – Test methods-Part 1 : Soluble binder content.
Note 3 to entry: “Independent test results” means results obtained in a manner not influenced by any previous result on the same or similar test sample. Quantitative measures of precision depend critically on the stipulated conditions. Repeatability and reproducibility conditions are particular sets of extreme conditions.
3.4
repeatability
precision under repeatability conditions
3.5
repeatability conditions
conditions in which independent test results are obtained with the same method on identical test items in the same laboratory by the same operator using the same equipment within short intervals of time
3.6
repeatability limit
maximum absolute difference between two test results obtained under repeatability conditions that may he expected with a probability of 95 %
Note ito entry: The symbol used for repeatability limit is r.
3.7
reproducibility
precision under reproducibility conditions
3.8
reproducibility conditions
conditions in which test results are obtained with the same method on identical test items in different laboratories with different operators using different equipment
3.9
reproducibility limit
maximum absolute difference between two test results obtained under reproducibIlity conditions that may be expected with a probability of 95 %
Note I to entry: The symbol used for reproducibility limit is R.
3.10
single test result
value obtained by applying the standard test method once, fully, on a single specimen
Note I to entry: The single test result can also be the mean of two or more observations or the result of a calculation from a set of observations as specified by the standard test method.
5.1 General principles of test
The test method for determining the binder content of a test portion of bituminous mixture, prepared In accordance with Clause 4, normally comprises the following basic operations:
a) binder extraction by dissolving in a hot or cold solvent;
b) separation of mineral matter from the binder solution;
c) determination of binder quantity by difference or binder recovery;
d) calculation of soluble binder content.
NOTE 1 The sequence of operations and choice of test procedures to be followed are illustrated in Figure A.1.
If it is suspected that water is present in the laboratory sample, the sample should either be dried to constant mass (see Clause 6), or the water content determined by the method described in EN 12697- 14, or the sample treated as In EN 12697-28.
NOTE 2 All test procedures and associated equipment relating to each basic operation shown in Figure A.1 are equally acceptable. Other equipment and procedures, including non-extraction methods, can also be used. There are documented data to show that the method and equipment will provide results with an accuracy and a precision no worse than that of one of the procedures explicitly shown in Figure A.1.
5.2 Binder extraction
5.2.1 Solvent
The tests in this document require the use of solvents capable of dissolving bitumen and in some cases involve distilling the solution to recover all or some of the bitumen.
NOTE Currently all hydrocarbon solvents are regarded as ‘hazardous and environmentally unfriendly” to varying degrees.
Until such time as there is an agreed CEN policy with regard to the usage of hydrocarbon solvents, each member state should specify its preferred solvent, taking into account the Montreal Protocol and the views of its own Regulatory Bodies (see also “Warning” in the Foreword).
Trichioroethylene should be stored in sealed bottles or canisters, which are protected against UV radiation.
When trichloroethylene is recovered by distillation for further use, care should be taken to ensure that the solvent still complies with the appropriate requirements. In particular, acidity may develop; a useful precaution is to store the solvent over calcium oxide in coloured glass or suitable metal containers.
5.2.3.1 Weigh the test portion to the nearest 0,1 g, and place it in the binder extraction apparatus in accordance with the requirements of the method selected from B.1, as appropriate.
5.2.3.2 The binder extraction procedure shall ensure that no soluble binder is left adhering to the aggregate particles after extraction.
NOTE In limited cases, it can be difficult to dissolve every trace of binder adhering to the aggregate (see A.4).
5.3 Separation of mineral matter
5.3.1 Apparatus
5.3.1.1 Trays, that can be heated without damage or change in mass and which are used to dry recovered aggregate.
5.3.1.2 Apparatus for the separation of mineral filler from the binder solution, conforming to
the requirements of the method selected from B.2, as appropriate.
5.3.2 Procedure
5.3.2.1 Collect the binder solution obtained in accordance with 5.2 and proceed in accordance with the method selected from B.2, as appropriate.
5.3.2.2 The procedure used to separate the mineral filler from the binder solution shall ensure that the residue on ignition of the recovered binder does not exceed 0.5 %, if the nominal filler content is less than 6 % of the mass of aggregate, or 1 % if the nominal filler content is 6 % or greater, when determined in accordance with Annex C.
NOTE 1 This check is not necessary for all samples but rather serves to prove the effectiveness of the method. NOTE 2 The residue depends on the solvent and the equipment used.
5.3.2.3 Transfer, where necessary, the clean recovered aggregate to a tray. Evaporate the solvent from the aggregate and the binder extraction apparatus. Transfer any remaining fine mineral matter from the binder extraction apparatus to the tray with the rest of the recovered aggregate, ensuring that all mineral matter has been removed from the binder extraction apparatus. Weigh and record the mass of the aggregate in the tray.
5.3.2.4 II required, determine the particle size distribution of the recovered aggregate in accordance with EN 12697-2, making due allowance for any mineral filler collected by the filter paper, where appropriate.EN 12697-1-2020 pdf download.
EN 12697-1-2020 pdf download
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