Introduction. DSTU EN 13108-1 establishes requirements for asphalt mixtures used for the arrangement of pavement layers of roads, airfields, etc. These asphalt mixtures are used for arranging the base layer, binding layer, and a surface layer.
Problem statement. A special feature of DSTU EN 13108-1 is that it establishes general requirements for all indicators, in particular for grading. That is there are no specific requirements for the grading of asphalt mixtures depending on the road category, traffic loading and the location of the asphalt concrete layer in the road pavement structure. Therefore, it is advisable to consider in detail the requirements for the grading of asphalt mixtures, compare them with the requirements of national standards and propose appropriate national requirements.
Purpose. Establishment of national requirements for the grading of asphalt mixtures according to DSTU EN 13108-1.
Materials and methods. Analysis of literary sources, comparison of the requirements of regulatory documents for the grading of asphalt concrete mixtures.
Results. The requirements for the content of grading of a certain fraction are indicated in the form of selected minimum and maximum values of passes through sieves with the size of meshes 1.4 D, D, 2 mm and 0.063 mm in percentage, the requirements for the grading can additionally be indicated in the documents related to using asphalt mixtures. Additional requirements for grading may also be established regarding the content of grains that pass through a sieve with a certain mesh size. At the same time, no more than two sieves of a suitable mesh size between 2 mm and D, and two sieves of a suitable mesh size between 2 mm and 0.063 mm can be selected. The requirements of DSTU EN 13108‑1 for grading have a wide range of values, which is probably related to the different possible areas of application of asphalt mitures.
Conclusions. As the DSTU EN 13108-1 standard establishes general requirements for grain composition, the corresponding requirements should be established in the national standard depending on the area of application of asphalt concrete mixtures.
When establishing the requirements for the grading, the requirements of DSTU B V.2.7‑119 regarding the content of grains bigger than 5 mm were taken as a basis, with the corresponding adjustment to the requirements of DSTU EN 13108-1, and proposals were made for the grading of asphalt mixtures and the possible area of their application.
