BS EN 12697-14:2020 pdf download

BS EN 12697-14:2020 pdf download.Bituminous mixtures —Test methods Part 14: Water content.
This document describes a test method for the determination of the water content of samples of bituminous mixtures. The test method is suitable for checking conformity to a product specification, where required.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 12697-27, Bituminous mixtures — Test methods — Part 27: Sampling
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedla: available at http://www.electropcdia.prg/
— ISO Online browsing platform: available at https:f/www.isu.orit/obp/ui 4 Reagents
Solvents used in this document shall be capable of dissolving bitumen and distilling the solution to recover the water present. The solvents shall not decompose In water and shall have a boiling point of not more than 85 °C to prevent the water from boiling.
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 their usage, each member state should speciI’ its prelerred solvent taking into account the Montreal Protocol and views of its own Regulatory Bodies (see also “Warning’ in the European foreword).
When trichloroethylene Is recovered by distillation for further use, care should be taken to ensure that the solvent still conforms to the appropriate requirements. In particular, acidity may develop and a useful precaution Is to store the solvent over calcium oxide in coloured glass or suitable metal containers.
The solvent should he checked regularly to ensure that it is “dry”.
The method consists of preheating a probe attached to a temperdture medsuring device befure measuring the temperature at stated depths in a number of locations while the asphalt is in one of several dilterent places and then calculating the average.
6 Preparation of laboratory samples of bituminous mixtures
If required, prepare laboratory samples in accordance with EN 12697-27 to obtain suitable test
portions.
7 Procedure
7.1 Take that part of the laboratory sample that was put aside during the sample reduction for the determination of water content and divide it into two portions by quartering and retain one portion in a closed container.
7.2 Weigh the other portion to the nearest 0,05 % and place it in a well-ventilated oven at
(110± 10) °C for 1 h. Re-weigh this portion and if the loss in mass is less than 0,1% no further action is
required except to record the result as <0,1 %. 7.3 If the loss in mass exceeds 0,1 % weigh the portion that was retained and transfer it to a dry hot extractor pot. Alternatively place the portion in the cylindrical container before transferring It to the extractor pot. A filter paper may be used to line the gauze container if desired. 7.4 Add sufficient solvent (see Clause 4) to permit relluxing to take place and then bolt on the cover with the dry gasket In position. Fit the receiver (see 5.2) and condenser (see 53) in place. Ensure an adequate flow of cold water through the condenser and heat the pot to give a steady reflux action. 7.5 Continue heating until the volume of water in the receiver remains constant for at least S mm. 7.6 Measure the volume of water and record its mass. NOTE For this method assume that 1 ml of water weighs 1g. 8 Expression of results Calculate the water content, in percent by mass, of either a) the original sample to the nearest 0,1 %, or b) the dried portions of the nearest 0,1 %. Record the water content to the nearest 0,1 % by mass. 9 Test report The test report shall contain at least the following information in addition to that required by Clause 8: a) name and address of the testing laboratory; b) unique serial number for test report c) name of the client; d) description and an identification of the sample, and the date of receipt; e) identification of the test method by reference to this document;