BS EN 12697-28:2020 pdf free

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BS EN 12697-28:2020 pdf free.Bituminous mixtures – Test methods,Preparation of samples for determining binder content, water content and grading.
BS EN 12697-28 This document describes test methods for preparing test portions for the determination of the binder,water content and grading of samples of bituminous mixtures, when the sample submitted to the laboratory has a mass greater than or equal to four times the test portion.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 932-1, Tests for general properties of aggregates一Part 1: Methods for sampling EN 12697-36, Bituminous mixtures一Test methods for hot mix asphalt一Part 36: Determination of the thickness of a bituminous pavement.If possible, remove chippings by hand before starting the tests. If removal is not possible (e.g. due to deep embedment), record this and proceed with the tests.NOTE Coated chippings can normally be removed with a suitable tool after warming the sample. For this purpose a temperature approximately 40 °C below the appropriate maximum temperature given in Table 1 is suitable.It may be possible to identify and remove the chippings after extraction of the binder and if this is done an allowance for the mass of the chippings should be made in the test and the fact recorded on the test report.If necessary, use a circular, stone cutting saw to separate courses, particularly with core samples. In situations where this approach and other physical methods of cold separation are impractical, lay the slab or core upside down on a clean sheet metal tray and warm it in a conventional oven just sufficiently to soften the material so that the courses may be separated.NOTE In some cases, insertion at the interface of the courses of a paint-stripping knife with a wide blade, or
similar tool, will assist in the separation.BS EN 12697-28 pdf download.

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