Study of the kinetics structure formation of cement dispersed systems. Part II
ABSTRACT: Introduction. The study of the kinetics structure formation is rarely the subject of a careful study. Although it is important for materials used to create elements of building structures, energy elements, thermoelements and materials for other purposes. The article proposes refinements...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
OOO "CNT «NanoStroitelstvo»
2022-09-01
|
| Series: | Нанотехнологии в строительстве |
| Subjects: | |
| Online Access: | http://nanobuild.ru/en_EN/journal/Nanobuild-4-2022/263-273.pdf |
| _version_ | 1828379864549294080 |
|---|---|
| author | Evgenij V. Korolev Anna N. Grishina Aleksandr S. Inozemtcev Arkady M. Ayzenshtadt |
| author_facet | Evgenij V. Korolev Anna N. Grishina Aleksandr S. Inozemtcev Arkady M. Ayzenshtadt |
| author_sort | Evgenij V. Korolev |
| collection | DOAJ |
| description | ABSTRACT: Introduction. The study of the kinetics structure formation is rarely the subject of a careful study. Although it is important for materials used to create elements of building structures, energy elements, thermoelements and materials for other
purposes. The article proposes refinements of the methodology for determining the parameters of the kinetics structure formation
of cement composites, including modified compositions. Methods and materials. The structure formation of cement systems with
plasticizers, microsized mineral additives (hydrosilicates of barium, copper, iron and zinc) and nanosized particles of zinc hydrosilicates has been studied. Results and discussion. It is proposed to single out two stages of initial structure formation: the stage
of setting the cement paste and the stage of hardening. It was found that the strength of the material at the stage of hardening
should be influenced by an additional factor, depending on the type of the introduced substance. A strong negative relationship
between the parameters α and n of the equation R(t) = Rmax(1–eatn
) at the hardening stage was confirmed. The trends identified at
the setting stage also demonstrated, namely: an increase in the rate of structure formation leading to the formation of a less dense
structure. Conclusions. An analysis of the change in the value of the internal dimension of the system during the transition from
the stage of setting to the stage of hardening made it possible to identify two trajectories of the system development. The first
trajectory appears only by combining the elements of the structure (trajectory No. 1). Preservation of the characteristic dimensions
of structural elements, but an increase in the proportion of elements with small dimensions (when the conditions that prevent the
combination of elements of the structure are realized) describes the second trajectory (trajectory No. 2). The implementation of
trajectory No. 2 is typical for compositions which the structure formation of cement stone is carried out in the presence of Melment
F15G plasticizer or microsized particles of copper or zinc. For other studied compositions, structure formation is proceeding with
the enlargement of structural elements. |
| first_indexed | 2024-12-10T03:46:58Z |
| format | Article |
| id | doaj.art-a0f9bbc343ef422f88f48bdf192c2ed5 |
| institution | Directory Open Access Journal |
| issn | 2075-8545 |
| language | English |
| last_indexed | 2024-12-10T03:46:58Z |
| publishDate | 2022-09-01 |
| publisher | OOO "CNT «NanoStroitelstvo» |
| record_format | Article |
| series | Нанотехнологии в строительстве |
| spelling | doaj.art-a0f9bbc343ef422f88f48bdf192c2ed52022-12-22T02:03:24ZengOOO "CNT «NanoStroitelstvo»Нанотехнологии в строительстве2075-85452022-09-0114426327310.15828/2075-8545-2022-14-4-263-273Study of the kinetics structure formation of cement dispersed systems. Part IIEvgenij V. Korolev0https://orcid.org/0000-0003-3600-812XAnna N. Grishina1https://orcid.org/0000-0002-0137-7155Aleksandr S. Inozemtcev2https://orcid.org/0000-0001-7807-688XArkady M. Ayzenshtadt3https://orcid.org/0000-0003-2904-2549Saint Petersburg State University of Architecture and Civil Engineering, St. Petersburg, RussiaMoscow State University of Civil Engineering, Moscow, RussiaMoscow State University of Civil Engineering, Moscow, RussiaNorthern (Arctic) Federal University, Arkhangelsk, RussiaABSTRACT: Introduction. The study of the kinetics structure formation is rarely the subject of a careful study. Although it is important for materials used to create elements of building structures, energy elements, thermoelements and materials for other purposes. The article proposes refinements of the methodology for determining the parameters of the kinetics structure formation of cement composites, including modified compositions. Methods and materials. The structure formation of cement systems with plasticizers, microsized mineral additives (hydrosilicates of barium, copper, iron and zinc) and nanosized particles of zinc hydrosilicates has been studied. Results and discussion. It is proposed to single out two stages of initial structure formation: the stage of setting the cement paste and the stage of hardening. It was found that the strength of the material at the stage of hardening should be influenced by an additional factor, depending on the type of the introduced substance. A strong negative relationship between the parameters α and n of the equation R(t) = Rmax(1–eatn ) at the hardening stage was confirmed. The trends identified at the setting stage also demonstrated, namely: an increase in the rate of structure formation leading to the formation of a less dense structure. Conclusions. An analysis of the change in the value of the internal dimension of the system during the transition from the stage of setting to the stage of hardening made it possible to identify two trajectories of the system development. The first trajectory appears only by combining the elements of the structure (trajectory No. 1). Preservation of the characteristic dimensions of structural elements, but an increase in the proportion of elements with small dimensions (when the conditions that prevent the combination of elements of the structure are realized) describes the second trajectory (trajectory No. 2). The implementation of trajectory No. 2 is typical for compositions which the structure formation of cement stone is carried out in the presence of Melment F15G plasticizer or microsized particles of copper or zinc. For other studied compositions, structure formation is proceeding with the enlargement of structural elements.http://nanobuild.ru/en_EN/journal/Nanobuild-4-2022/263-273.pdfcement bindercement hydrationstructure formationplasticizer |
| spellingShingle | Evgenij V. Korolev Anna N. Grishina Aleksandr S. Inozemtcev Arkady M. Ayzenshtadt Study of the kinetics structure formation of cement dispersed systems. Part II Нанотехнологии в строительстве cement binder cement hydration structure formation plasticizer |
| title | Study of the kinetics structure formation of cement dispersed systems. Part II |
| title_full | Study of the kinetics structure formation of cement dispersed systems. Part II |
| title_fullStr | Study of the kinetics structure formation of cement dispersed systems. Part II |
| title_full_unstemmed | Study of the kinetics structure formation of cement dispersed systems. Part II |
| title_short | Study of the kinetics structure formation of cement dispersed systems. Part II |
| title_sort | study of the kinetics structure formation of cement dispersed systems part ii |
| topic | cement binder cement hydration structure formation plasticizer |
| url | http://nanobuild.ru/en_EN/journal/Nanobuild-4-2022/263-273.pdf |
| work_keys_str_mv | AT evgenijvkorolev studyofthekineticsstructureformationofcementdispersedsystemspartii AT annangrishina studyofthekineticsstructureformationofcementdispersedsystemspartii AT aleksandrsinozemtcev studyofthekineticsstructureformationofcementdispersedsystemspartii AT arkadymayzenshtadt studyofthekineticsstructureformationofcementdispersedsystemspartii |