The paper presents a fragment of on-going investigations directed on creation of optimum data environment that ensures an access to world scientific journals and other publications which are necessary for qualitative implementation of works on priority directions of R&D in the field of road-construction industry in the period of 2016–2020. A citation analysis has been applied while using data of Journal Citation Reports for selection of world scientific serial publiccations which are necessary for execution of investigations on heat and mass transfer in road dressings. The road dressings are considered as open heterogeneous thermodynamic systems. Their deformations occur under various climatic conditions due to heat and mass transfer processes and interaction of transport flows and road surface. Crack formation takes place in depth of the road dressings and on road surfaces as a result of temperature, mass transfer processes. As it is known material structure of constructive layers especially which are created with the help of technogenic wastes (asphalt-concrete, concrete, reinforced concrete scrap and products of its recycling, brick rubble, various wastes of production etc.) influence on heat and mass transfer. The paper presents results of investigations on heat flows, boundary layers according to air viscosity, velocity of geometric permeability characteristics, capillary pressures in road pavements.
The article addresses the issues of structure formation of road composite materials containing hydraulic (рortland cement) and organic (bitumen) binders. It has been determined that organic and hydraulic binders, being thermodynamically incompatible, are capable of interaction and complement each other. Structure formation processes are associated with interphase transition layers interaction mechanism and the direct formation of phase contacts with cement crystallohydrates. The interphase boundary is diffuse and is established through interphase transition layers. The emergence of interfacial layers is thermodynamically advantageous, since it contributes to a decrease in Gibbs free energy and does not contradict modern concepts of solid state physics. It was established that with cement content of about 30 % of complex bitumen-cement binder volume, there will appear (nucleate) phase contacts that will prevail in the binder structure when the cement content is more than 60 %. In the case phase contacts prevail, concrete will demonstrate significant strength at high temperatures, but low temperature and fatigue crack resistance, which will lead to their durability loss. The cement content of 30–40 % of the total complex binder can be considered optimal.
Белорусский государственный экономический университет, Минск, Беларусь ЭКОЛОГОБЕЗОПАСНЫЕ ТЕХНОЛОГИИ ПРИМЕНЕНИЯ ОТХОДОВ ПРОМЫШЛЕННОСТИ КИТАЯ ПРИ РЕГЕНЕРАЦИИ АСФАЛЬТОБЕТОННЫХ ПОКРЫТИЙ Аннотация. Представлена разработка технологии регенерации отработанных асфальтобетонных покрытий при условии применения отходов промышленности и получения экологически безопасных асфальтобетонных покрытий. Для исследований выбрана технология диспергирования и перемешивания отходов для достижения их однородности и активации смеси с целью повышения физико-химического взаимодействия с вяжущими веществами. Показано, что в материалах на органогидравлических вяжущих тяжелые металлы, содержащиеся в отходах и в асфальтогрануляте, надежно блокируются, их миграция в окружающую среду существенно снижается. При оптимальном содержании битумной эмульсии и цемента наблюдается эффект максимальной структурной прочности дорожностроительного материала и максимальной фиксации ионов тяжелых металлов. Предложенные технические решения обоснованы теоретическими расчетами и позволяют осуществлять экологобезопасную регенерацию асфальтобетонных покрытий. Ключевые слова: отходы промышленности, экологобезопасные технологии, асфальтобетон, тяжелые металлы Для цитирования. Экологобезопасные технологии применения отходов промышленности при регенерации асфальтобетонных покрытий / Б. М. Хрусталев [и др.] // Вес. Нац. акад. навук Беларусi.
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