zldmЗаводская лаборатория. Диагностика материаловIndustrial laboratory. Diagnostics of materials1028-68612588-0187ООО «Издательство «ТЕСТ-ЗЛ»10.26896/1028-6861-2024-90-7-40-47zldm-2248Research ArticleИССЛЕДОВАНИЕ СТРУКТУРЫ И СВОЙСТВSTRUCTURE AND PROPERTIES INVESTIGATIONИсследование микроструктуры асфальтобетона с использованием рентгеновской компьютерной томографииStudy of the microstructure of asphalt concrete using X-ray computed tomographyЛомовС. В.LomovS. V.

Степан Владимирович Ломов 

121205, Москва, Большой бульвар, д. 30, стр. 1

Stepan V. Lomov 

30, str. 1, Bolshoy bulvar, Moscow, 121205, Russia

S.Lomov@skoltech.ruМорковкинА. И.MorkovkinA. I.

Андрей Игоревич Морковкин 

121205, Москва, Большой бульвар, д. 30, стр. 1

Andrey I. Morkovkin 

30, str. 1, Bolshoy bulvar, Moscow, 121205, Russia

Сколковский институт науки и технологий, Центр добычи углеводородовРоссияSkolkovo Institute of Science and Technology, Center for Petroleum Science and EngineeringRussian Federation2024270720249074047Copyright © Ломов С.В., Морковкин А.И., 20242024Ломов С.В., Морковкин А.И.Lomov S.V., Morkovkin A.I.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.zldm.ru/jour/article/view/2248

В рамках проекта по утилизации полимерных композиционных материалов с волоконным армированием (стеклопластика) при производстве асфальтобетона разработан механический цифровой двойник образца материала — механическая конечно-элементная модель. В работе представлены результаты исследования микроструктуры асфальтобетона и расчета его эффективных механических параметров с использованием методов рентгеновской микрокомпьютерной томографии (КТ). Представлена последовательность обработки данных для создания цифрового двойника микроструктуры асфальтобетона на основе КТ-изображения, включающая следующие этапы: 1) предварительная обработка; 2) сегментация изображения; 3) анализ морфологии пор и твердых частиц; 4) преобразование сегментированного изображения в модель конечных элементов (КЭ) на основе вокселей. Показано, что разрешения КТ-изображения в 40 мкм достаточно для надежной идентификации параметров микроструктуры асфальтобетона: объемных долей фракций, распределения размеров, формы и положения пор, размеров измельченных хрупких добавок (крошки стеклопластика). КЭ-модель — цифровой двойник материала — после задания характеристик составляющих материала может применяться для моделирования термомеханических и функциональных свойств. Моделирование проиллюстрировано для расчета статистики модулей сжатия и сдвига асфальтобетона с добавлением крошки стеклопластика. Проведен анализ зависимости расчетных упругих характеристик от размера цифрового двойника. Выявлено, что при размере более 10 мм репрезентативность микроструктуры материала достаточна для расчета гомогенизированных свойств. Полученные результаты могут быть использованы для анализа микроструктуры и структурно-зависимых термомеханических свойств асфальтобетонов, предложенная КЭ-модель — для расчета вязкоупругого поведения асфальтобетона и циклических нагрузок.

A mechanical digital twin (a mechanical finite-element model) of an asphalt concrete sample has been developed in the framework of a project for recycling polymer composite materials with fibrous reinforcement (fiberglass) as an alternative for crushed stone in the asphalt concrete production. A methodology of using X-ray computed tomography (XCT) for analysis of the asphalt concrete microstructure and calculation of the mechanical properties is developed. The data processing chain for developing a digital twin of the asphalt concrete microstructure, based on X-ray micro-computed tomography (XCT) image includes the following steps: 1) image enhancement; 2) image segmentation; 3) analysis of the morphology of pores and solid particles; 4) transformation of the segmented image into a voxels-based finite element (FE) model. It is demonstrated that the XCT resolution of 40 μm is sufficient for a reliable identification of microstructural parameters, i.e., volume fractions of the components, distributions of voids (pores) in size, shape and spatial position, as well as distributions of the crushed brittle additives (fiberglass chips) in size. The FE model constitutes a digital twin of the material, and, after specifying the characteristics of the material components, can be used for simulation of the thermomechanical and functional properties of the material. The developed procedure is exemplified in the calculation of statistics of the compression and shear moduli of the asphalt concrete with addition of crushed fiberglass particles. The dependence of the calculated elastic properties on the size of the digital twin is studied. It is shown that a model size of 10 mm and more is sufficient for the microstructural representativity and calculation of the homogenization characteristics. The results can be used for analysis of the microstructure and structure-dependent thermomechanical properties of asphalt concrete. The developed finite element model can be used for modelling of the visco-elastic response of asphalt concrete and its behavior under cyclic loading.

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The authors declare that there are no conflicts of interest present.