Volumetric-functional design of road asphalt concrete mixtures
V. I. Bratchun, D. I. Borodai, E. L. Radyukova, V. V. Zhevanov, E. D. Razmyslova
Donbas National Academy of Civil Engineering and Architecture
Annotation: The design of road asphalt concrete using the “Superpave” method is carried out in several stages: the required grade of organic binder is calculated based on the design temperatures (maximum and minimum) of the road climatic zone, based on the softening and brittleness temperatures; depending on the number of uniaxial loads (UNL), the technical category of the road is determined with the number of ULL from 0.3 to 30 million units. for 20 years; mineral materials are selected and the mineral core of asphalt concrete is designed; samples of the asphalt concrete mixture are prepared at a binder temperature corresponding to a viscosity of 0.17 Pa∙sec in a laboratory mixer; the mixture is thermostated at compaction temperature for 120 minutes; compact the samples at a temperature corresponding to the viscosity of the organic binder of 0.28 Pa∙sec on a rotary compactor (gyrator, which simulates the operation of a skating rink); using samples, the volumetric properties of the designed composition of road asphalt concrete are determined (content of air voids, number of voids in the mineral filler); adjust the content of organic binder; select the optimal content of organic binder; determine the quality indicators of the designed asphalt concrete: resistance to rutting, water resistance, fatigue life, ability to withstand low-temperature deformations.
Keywords: road asphalt concrete, volumetric and functional design of asphalt concrete composition, regulatory documents.
Pages: 39-43.
Link for citation: Bratchun, V. I.; Borodai, D. I.; Radyukova, E. L. [et al.]. Volumetric-functional design of road asphalt concrete mixtures. – Text : direct. – In: The Donbas Constructon. – 2024. – Issue 2-2024. – Р. 39-43.
Issue 2-2024Journal: The Donbas Constructon
Publish house: Donbas National Academy of Civil Engineering and Architecture