Building materials and products

Original article

DOI: https://doi.org/10.24866/2227-6858/2023-2/73-85

Leonovich S., Сhao Feng, Miao Jijun, Junwei Liu, Malyuk V., Shaly E.,
Litvinovsky D., Kolodey A., Stepanova A.

SERGEY N. LEONOVICH, Doctor of Engineering Sciences, Professor, Head of the Department, Chief Researcher of the Center for Scientific Research and Testing of Building Structures, leonovichsn@tut.by
ALINA V. KOLODEY, Engineer of the Department "Building materials and construction technology"
Belarusian National Technical University
DMITRY A. LITVINOVSKII, Chief Engineer
InzhSpetsStroyProekt LLC
Minsk, Republic of Belarus
CHAO FENG, MIAO JIJUN, JUNWEI LIU
Qingdao University of Technology
Qingdao, China
VLADISLAV V. MALYUK, Senior Lecturer, Department of Construction 
Technical Oil and Gas Institute
Sakhalin State University
Yuzhno-Sakhalinsk, Russia
EVGENIY E. SHALY, Leading Engineer
PrimorProjectBureau LLC
Vladivostok, Russia
ANNA V. STEPANOVA, Senior Lecturer of the Department "Building technologies and structures"
Belarusian State University of Transport
Gomel, Republic of Belarus

Structural concrete at high temperature: carbonization, decarbonization and recarbonization

Abstract. The multichemophysical model of the processes of carbonization, decarbonization and recarbonization of concrete at high temperatures is analyzed. Experimental validation of the integrated model is carried out using thermogravimetric tests of cement stone and the strength of mortar composites immediately after high-temperature heating and after fire curing. CO2 concentration and humidity are experimentally varied as thermodynamic boundary conditions for wide range testing and validation. Compressive strength is not considered as a property of the material, but as a calculated structural characteristic of a cylindrical solid, where temperature, degree of hydration and carbonization develop unevenly. The developed model makes it possible to study wet, fire-damaged concrete as a composite multiscale material.

Keywords: concrete, high temperature, fire curing, carbonization, decarbonization, recarbonization models

See the reference in English at the end of the article

For citation: Leonovich S., Сhao Feng, Miao Jijun, Junwei Liu, Malyuk V., Shaly E., Litvinovsky D., Kolodey A., Stepanova A. Structural concrete at high temperature: carbonization, decarbonization and recarbonization. FEFU: School of Engineering Bulletin. 2023;(2):73-85. (In Russ.).