Verification оf Non-Stationary Mathematical Model оf Concrete Hardening in Thermal Technological Installations
Thermo-technical installations consuming significant amounts of thermal energy are used in order to intensify precast and reinforced concrete production processes under industrial conditions. Despite significant progress in the study of concrete hardening in accelerated hydration devices, a prominen...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | Russian |
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Belarusian National Technical University
2019-04-01
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| Series: | Nauka i Tehnika |
| Subjects: | |
| Online Access: | https://sat.bntu.by/jour/article/view/1952 |
| _version_ | 1811213935251030016 |
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| author | A. M. Niyakovskii V. N. Romaniuk A. N. Chichko Yu. V. Yaczkevich |
| author_facet | A. M. Niyakovskii V. N. Romaniuk A. N. Chichko Yu. V. Yaczkevich |
| author_sort | A. M. Niyakovskii |
| collection | DOAJ |
| description | Thermo-technical installations consuming significant amounts of thermal energy are used in order to intensify precast and reinforced concrete production processes under industrial conditions. Despite significant progress in the study of concrete hardening in accelerated hydration devices, a prominent lack of reliable and cost-effective research and optimization methods of their operation is observed. The methods used in real production processes are mainly based on empirical dependences obtained for specific technological conditions. These methods can not always be applied for other modes and technologies. The present paper develops calculation methods based on fundamental laws that make it possible to obtain functions for evolution of concrete product hydration process. Methods of mathematical modeling permit to develop new ways directed on improvement of modes for heat treatment of concrete products and accelerated hydration technologies. The paper describes a mathematical model for calculating a hardening process of a concrete product that includes a transient three-dimensional heat conductivity equation, a function of internal heat release due to behavior of exothermic reactions of cement hydration and also a system of initial and boundary conditions. A numerical simulation for temperature and hydration coefficient of a concrete product having shape of a 0.1´0.1´0.1 m cube has been performed in the paper. Verification of the non-stationary mathematical model for calculating temperature fields and hydration degree while using experimental data on concrete product strength obtained under industrial conditions. Investigations on hydration degree function of time have shown that experimentally obtained values of compressive strength correlate with hydration coefficient and hydration rate functions of heat treatment time which are calculated on the basis of the proposed non-stationary mathematical model of concrete product hardening. Satisfactory agreement of experimental and calculated data confirms adequacy of the proposed non-stationary mathematical model for calculating temperature fields and hydration degree with accelerated heat treatment of concrete products. |
| first_indexed | 2024-04-12T05:54:34Z |
| format | Article |
| id | doaj.art-2ccbcf19f9a9439393496a1849282f9e |
| institution | Directory Open Access Journal |
| issn | 2227-1031 2414-0392 |
| language | Russian |
| last_indexed | 2024-04-12T05:54:34Z |
| publishDate | 2019-04-01 |
| publisher | Belarusian National Technical University |
| record_format | Article |
| series | Nauka i Tehnika |
| spelling | doaj.art-2ccbcf19f9a9439393496a1849282f9e2022-12-22T03:45:11ZrusBelarusian National Technical UniversityNauka i Tehnika2227-10312414-03922019-04-0118213714510.21122/2227-1031-2019-18-2-137-1451783Verification оf Non-Stationary Mathematical Model оf Concrete Hardening in Thermal Technological InstallationsA. M. Niyakovskii0V. N. Romaniuk1A. N. Chichko2Yu. V. Yaczkevich3Polotsk State UniversityBelarusian National Technical UniversityBelarusian National Technical UniversityBelarusian National Technical UniversityThermo-technical installations consuming significant amounts of thermal energy are used in order to intensify precast and reinforced concrete production processes under industrial conditions. Despite significant progress in the study of concrete hardening in accelerated hydration devices, a prominent lack of reliable and cost-effective research and optimization methods of their operation is observed. The methods used in real production processes are mainly based on empirical dependences obtained for specific technological conditions. These methods can not always be applied for other modes and technologies. The present paper develops calculation methods based on fundamental laws that make it possible to obtain functions for evolution of concrete product hydration process. Methods of mathematical modeling permit to develop new ways directed on improvement of modes for heat treatment of concrete products and accelerated hydration technologies. The paper describes a mathematical model for calculating a hardening process of a concrete product that includes a transient three-dimensional heat conductivity equation, a function of internal heat release due to behavior of exothermic reactions of cement hydration and also a system of initial and boundary conditions. A numerical simulation for temperature and hydration coefficient of a concrete product having shape of a 0.1´0.1´0.1 m cube has been performed in the paper. Verification of the non-stationary mathematical model for calculating temperature fields and hydration degree while using experimental data on concrete product strength obtained under industrial conditions. Investigations on hydration degree function of time have shown that experimentally obtained values of compressive strength correlate with hydration coefficient and hydration rate functions of heat treatment time which are calculated on the basis of the proposed non-stationary mathematical model of concrete product hardening. Satisfactory agreement of experimental and calculated data confirms adequacy of the proposed non-stationary mathematical model for calculating temperature fields and hydration degree with accelerated heat treatment of concrete products.https://sat.bntu.by/jour/article/view/1952mathematical modellingthermo-technical installationshardening of a concrete productkinetics of cement hydrationtemperature fieldtransient heat conductivity equation |
| spellingShingle | A. M. Niyakovskii V. N. Romaniuk A. N. Chichko Yu. V. Yaczkevich Verification оf Non-Stationary Mathematical Model оf Concrete Hardening in Thermal Technological Installations Nauka i Tehnika mathematical modelling thermo-technical installations hardening of a concrete product kinetics of cement hydration temperature field transient heat conductivity equation |
| title | Verification оf Non-Stationary Mathematical Model оf Concrete Hardening in Thermal Technological Installations |
| title_full | Verification оf Non-Stationary Mathematical Model оf Concrete Hardening in Thermal Technological Installations |
| title_fullStr | Verification оf Non-Stationary Mathematical Model оf Concrete Hardening in Thermal Technological Installations |
| title_full_unstemmed | Verification оf Non-Stationary Mathematical Model оf Concrete Hardening in Thermal Technological Installations |
| title_short | Verification оf Non-Stationary Mathematical Model оf Concrete Hardening in Thermal Technological Installations |
| title_sort | verification оf non stationary mathematical model оf concrete hardening in thermal technological installations |
| topic | mathematical modelling thermo-technical installations hardening of a concrete product kinetics of cement hydration temperature field transient heat conductivity equation |
| url | https://sat.bntu.by/jour/article/view/1952 |
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