CONCRETE

UDC 691.41

[:en]Markova I. Yu.[:ru]Маркова И. Ю.[:] [:en]Candidate of Technical Sciences, Associate Professor of the Department of Materials Science and Technology of Materials, Belgorod State Technological University named after V. G. Shukhov, Belgorod, Russia[:ru]канд. техн. наук, доцент кафедры «Материаловедение и технология материалов», Белгородский гос. технологический университет им. В. Г. Шухова, Белгород, Россия[:]

[:en]Bezrodnykh A. A.[:ru]Безродных А. А.[:] [:en]Researcher, Research Institute \"Nanosystems in building materials\" of Innovative scientific and educational and experimental-industrial center of nanostructured composite materials, Belgorod State Technological University named after V. G. Shukhov, Belgorod, Russia[:ru]науч. сотрудник, НИИ «НСМ» ИНО и ОПЦ НКМ, Белгородский гос. технологический университет им. В. Г. Шухова, Белгород, Россия[:]

[:ru]Строкова В. В.[:en]Strokova, V. V.[:] [:ru]д. т. н., профессор РАН, зав. кафедрой «Материаловедение и технология материалов», Белгородский государственный технологический университет им. В. Г. Шухова, Россия[:en]V.G. Dr.-Ing, professor, Department of \"Materials and Materials Technology\", Shukhov Belgorod State Technological University, Belgorod, Russia[:]

[:en]Nelyubova V. V.[:ru]Нелюбова В. В.[:] [:en]Doctor of Technical Sciences, Associate Professor, Professor of the Department of Materials Science and Technology of Materials, Belgorod State Technological University named after V. G. Shukhov, Belgorod, Russia[:ru]д-р техн. наук, доцент, профессор кафедры «Материаловедение и технология материалов», Белгородский гос. технологический университет им. В. Г. Шухова, Белгород, Россия[:]

[:en]Stepanenko M. A.[:ru]Степаненко М. А.[:] [:en]engineer, Research Institute \"Nanosystems in building materials\" of Innovative scientific and educational and experimental-industrial center of nanostructured composite materials, Belgorod State Technological University named after V. G. Shukhov, Belgorod, Russia[:ru]инженер, НИИ «НСМ» ИНО и ОПЦ НКМ, Белгородский гос. технологический университет им. В. Г. Шухова, Белгород, Россия[:]

[:en]Botsman L. N.[:ru]Боцман Л. Н.[:] [:en]Candidate of Technical Sciences, Associate Professor, Associate Professor of the Department of Materials Science and Technology of Materials, Belgorod State Technological University named after V. G. Shukhov, Belgorod, Russia[:ru]канд. техн. наук, доцент кафедры «Материаловедение и технология материалов», Белгородский гос. технологический университет им. В. Г. Шухова, Белгород, Россия[:]

Alitinform №2 (67) 2022 г. 28-46 p.

Abstract

The paper is devoted to the issues of changing the properties of soil concrete as a result of strengthening with a complex of binders (cement, bitumen emulsion) when using an active mineral additive in the form of acidic fly ash-depending on the type of soil (light sandy loam, heavy sandy loam). First of all the analysis of the systems “soil — cement — fly ash” and “soil — bitumen emulsion — fly ash” was carried out. It is established that it is most expedient and effective to use acidic fly ash of Troitskaya condenser-type thermal power station as part of the soil concrete. Replacing cement with ash by 25 % insignificantly reduces the strength of the reinforced soil by 3–5 %, which allows providing a margin of safety of the final material. The use of bitumen emulsion provides an increase in the water contact angle by 26 and 34 % in the case of light and heavy loam, respectively, which leads to a uniform distribution of bitumen films on the soil surface without its absorption by layered silicates. At the same time, based on mathematical modeling of the experiment, it was found that the optimal proportion of ash from the mass of solid components in the composition of soil concrete is 1.6 % with a content of 5 % cement and 5 and 9 % bitumen emulsion for light loam and heavy loam, respectively. Complex reinforcement provides the possibility of obtaining a soil composite with specified strength indicators with reduced cement consumption and an increase in the water-physical properties of the material, which is due to the directional regulation of the matrix consolidation processes.

Key words:

cement, bitumen emulsion, fly ash, light sandy loam, heavy sandy loam, soil concrete