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Modeling of the processes of early structure formation and hardening of cement materials with organomineral additives

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Název: Modeling of the processes of early structure formation and hardening of cement materials with organomineral additives
Autoři: O.V. Tarakanov, I.V. Erofeeva, E.A. Belyakova, R.N. Moskvin, Ya.A. Sanyagina, I.A. Khristoforova
Zdroj: Нанотехнологии в строительстве, Vol 16, Iss 6, Pp 510-524 (2024)
Informace o vydavateli: CNT Nanostroitelstvo, 2024.
Rok vydání: 2024
Témata: Building construction, structure formation, organomineral additives, microfillers, nanohydrosilicate technologies, high-strength concretes, TH1-9745, crystallization centers
Popis: Introduction. At present, chemical modifiers are widely used in concrete technology, most of which are complex. The development of the theory and practice of high-strength concrete of the new generation has entailed the development and implementation of complex organomineral additives, which include modern superplasticizers (SP) and finely ground mineral fillers. High-strength concretes are multifunctional concretes that combine, along with high strength, other important properties – high frost resistance, water resistance, elastic-plastic properties, etc. Materials and research methods. Achieving high concrete performance is possible through the use of superplasticizers in combination with finely ground microfillers – stone flour, including nanoparticles and dispersed reinforcement. In this article, the main task is to model the development of the microstructure of cement stone with organomineral additives. For this purpose, a model of the development of the microstructure over time was developed taking into account the possible mechanisms of the influence of components on the composition of hydration products and the nature of early structure formation. Results and discussion. It is shown that the analysis of structural topology and modeling of the processes of formation of the microstructure of filled cement compositions, carried out together with the analysis of hydration products and hardening kinetics, allow us to predict possible mechanisms of action of complex additives and, in a certain sense, to predict possible scenarios for the development of the microstructure of cement stone, which largely determines the main physical and chemical properties of concrete and its durability. Conclusion. Experimental studies have shown that the use of a mixture of microfillers made it possible to achieve a concrete compressive strength of more than 115 MPa on the 28th day of normal hardening, and the insertion of calcium silicate hydrous into the concrete mixture increased the early strength of the hardening composite.
Druh dokumentu: Article
ISSN: 2075-8545
DOI: 10.15828/2075-8545-2024-16-6-510-524
Přístupová URL adresa: https://doaj.org/article/bac11327c5ba4f33ab46fe4ce29acad8
Přístupové číslo: edsair.doi.dedup.....80be194557a1fc8b845f0f33fa5ddf8b
Databáze: OpenAIRE
Popis
Abstrakt:Introduction. At present, chemical modifiers are widely used in concrete technology, most of which are complex. The development of the theory and practice of high-strength concrete of the new generation has entailed the development and implementation of complex organomineral additives, which include modern superplasticizers (SP) and finely ground mineral fillers. High-strength concretes are multifunctional concretes that combine, along with high strength, other important properties – high frost resistance, water resistance, elastic-plastic properties, etc. Materials and research methods. Achieving high concrete performance is possible through the use of superplasticizers in combination with finely ground microfillers – stone flour, including nanoparticles and dispersed reinforcement. In this article, the main task is to model the development of the microstructure of cement stone with organomineral additives. For this purpose, a model of the development of the microstructure over time was developed taking into account the possible mechanisms of the influence of components on the composition of hydration products and the nature of early structure formation. Results and discussion. It is shown that the analysis of structural topology and modeling of the processes of formation of the microstructure of filled cement compositions, carried out together with the analysis of hydration products and hardening kinetics, allow us to predict possible mechanisms of action of complex additives and, in a certain sense, to predict possible scenarios for the development of the microstructure of cement stone, which largely determines the main physical and chemical properties of concrete and its durability. Conclusion. Experimental studies have shown that the use of a mixture of microfillers made it possible to achieve a concrete compressive strength of more than 115 MPa on the 28th day of normal hardening, and the insertion of calcium silicate hydrous into the concrete mixture increased the early strength of the hardening composite.
ISSN:20758545
DOI:10.15828/2075-8545-2024-16-6-510-524