Bituminous mixtures - Test methods. Pt. 7: Determination of the bulk density of bituminous specimens by gamma rays; German and English version prEN 12697-7:2020. Draft

This document describes a method for measuring the bulk density of asphalt mixtures for pavements when a gamma-ray transmission direction is used. This document applies to cylindrical or block-shaped test specimens produced in the laboratory or taken from a pavement, whose thickness and mass absorption coefficient dependent on the chemical composition are known. The thickness of the specimen penetrated by gamma rays during the measurement shall be between 30 mm and 300 mm. This method cannot be applied to materials containing slags with different metal contents or with different chemical compositions. The committee NA 005-10-10 AA "Asphalt (SpA to CEN/TC 227/WG 1) Joint Committee with FGSV" at DIN is responsible for this draft standard. Compared to DIN EN 12697-7:2015-05, the following changes were made: a) the title no longer refers to hot asphalt; b) editorial adjustment to the current standard template; c) the scope according to DIN 820-2:2020-03, 14.5 clarified; d) section 4: exponential law including equation deleted, reference to section 8 added; e) section 5. 1: Footnote 1 changed to Note, existing Note changed to regular text; f) Section 6: Note 1: Period during which samples are considered dry changed to 4 hours to align with other parts; g) Section 6: Footnote 2 changed to Note 2, existing Note changed to Note 1; h) Section 7.3.3: Formula for consistency test deleted and replaced with reference to formula (1); i) Section 8: editorial adjustment, renumbered formulae and addition of references to formulae.