DETERMINATION OF CONCRETE THERMO-CHEMICAL DESTRUCTION REGULATIONS UNDER THE INFLUENCE OF HIGH TEMPERATURES
DOI:
https://doi.org/10.15421/jchemtech.v32i2.298636Keywords:
thermochemical cracking; destruction of concrete; change in the chemical composition of concrete.Abstract
The study solved the problem of investigating the mechanism of concrete destruction under the influence of high temperatures as a result of an explosion. The destruction of the concrete floor after the impact of the projectile was established, which is explained by the effect of high temperatures. Concrete samples at different distances from the epicenter had a melted surface and a change in color. The use of the TPD-MS method showed that CO was released from a sample located 1.5 m from the epicenter with an intensity of 0.016 at the temperature of 100 °С; from a distance of up to 2 m with an intensity of 0.006; from the control sample with an intensity of 0.01 at 583 °С. A control sample of concrete when heated to 583 °С emitted CO2 with an intensity of 0.16; the sample was obtained at a distance of up to 2 m with an intensity of 0.1 at 537 °С. In the concrete samples obtained at a distance of 0.5 m to 2 m, CO2 emission was minimal with an intensity of 0.04 at 537 °С. The carbon content (СО, СО2) in concrete decreases when approaching the epicenter of the explosion. The highest intensity of water evaporation of 0.8 when heated to 100 °С was observed from a concrete sample within a radius of up to 1.5 m from the epicenter. Sulfur was released in small amounts when heated to 1000 °С in all concrete samples. SO2 and SO compounds were isolated from a sample obtained at a distance of 1.5 from the explosion. The feature of the experiment is the investigation of thermomechanical and thermochemical changes in concrete under the influence of high temperatures. The conducted research is distinguished by the use of scanning electron microscopy and TPD-MS methods for the study of structural and chemical changes in concrete. The results of the experiment can be used to determine the degree of destruction of concrete after explosion and fire for the restoration of the building.
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