title: Ð Ð°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ° ÑÐ°ÑÑÐ¸ÑÑÑÑÐµÐ¹ Ð´Ð¾Ð±Ð°Ð²ÐºÐ¸ Ð½Ð° Ð¾ÑÐ½Ð¾Ð²Ðµ Ð·Ð¾Ð»Ñ ÑÐ½Ð¾ÑÐ° Ð´Ð»Ñ Ð±ÐµÐ·ÑÑÐ°Ð´Ð¾ÑÐ½Ð¾Ð³Ð¾ Ð±ÐµÑÐ¾Ð½Ð°
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Development of an expanding additive based on fly ash for non-shrinkable concrete
Creators: name: ÐÑÐ¾ÑÐ¾Ð²Ð°, ÐÐ°ÑÐ¸Ð»Ñ
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2023
Subjects: ÐÐµÑÐ¾Ð½
ÐÐ¾Ð»Ð°
Ð·Ð¾Ð»Ð° ÑÐ½Ð¾ÑÐ°
Ð²ÑÑÐ¾ÐºÐ¾ÐºÐ°Ð»ÑÑÐ¸ÐµÐ²Ð°Ñ Ð·Ð¾Ð»Ð° ÑÐ½Ð¾ÑÐ°
Ð·Ð¾Ð»Ð¾ÑÐ»Ð°ÐºÐ¾Ð²ÑÐµ Ð¼Ð°ÑÐµÑÐ¸Ð°Ð»Ñ
Ð²ÑÐ¾ÑÐ¸ÑÐ½Ð¾Ðµ ÑÑÑÑÐµ
Ð¼Ð¸Ð½ÐµÑÐ°Ð»ÑÐ½ÑÐµ Ð´Ð¾Ð±Ð°Ð²ÐºÐ¸
ÑÐ°ÑÑÐ¸ÑÑÑÑÐ¸Ðµ Ð´Ð¾Ð±Ð°Ð²ÐºÐ¸
fly ash
high-calcium fly ash
ash and slag materials
secondary raw materials
mineral additives
expansion additives

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description: The main purpose of the work is to study the possibilities of using fly ash as an active mineral additive for concrete and the possibility of using the expanding effect that occurs when fly ash interacts with water to compensate for shrinkage deformations in concrete. Tasks that were solved during the study: 1. Investigation of the possibility of using high-calcium fly ash as an expansion additive for concrete. 2. Development of the composition of an expansion additive based on high-calcium fly ash of the Nazarovo power station, which allows to compensate for the shrinkage of concrete. 3. Investigation of the effect of the expansion additive on the properties of concrete (shrinkage, strength). 4. Assessment of the economic and environmental effect when using fly ash as an active expansion additive for concrete. Pilot tests for the study of fly ash from the Nazarovo power stationand concrete based on it were carried out in the laboratories of the SPbPU Civil Engineering Institute in accordance with proven methods using certified equipment and digital software systems. During laboratory tests, the following physical and mechanical characteristics of the beam samples were determined: linear expansion, compressive strength, bending strength. To determine the expanding effect of fly ash at the Nazarovo power station, tests were carried out on Le Chatelier rings, as well as X-ray phase and differential thermal analysis of fly ash hydration products. The data obtained were analyzed using digital software systems: Microsoft Office Excel 2020, Autodesk AutoCAD 2022, Thermoscan-standard, Thermoscan-sample. According to the results of the research, the optimal composition of the expansion additive was selected, the most effective for preventing shrinkage deformations in concrete. It is also determined that the replacement of cement with pure fly ash of the Nazarovo power station practically does not affect the strength of concrete, both during bending and compression. Also, the analysis of economic and environmental aspects of replacing a part of the cement binder with fly ash of the Nazarovo ppwer station was carried out in the work. As a result of the work, it was found that the use of fly ash from the Nazarovo power station as a component of an expanding additive for concrete is a promising direction, both from a technical and economic and environmental point of view and can be used in the design of non-shrinkable concrete.