Research of changes in the dynamic hardness of gypsum boards under the influence of thermal effects of fire
DOI:
https://doi.org/10.33408/2519-237X.2024.8-3.253Keywords:
inspection of the fire site, gypsum board, thermal damage, shock-pulse method, seat of fireAbstract
Purpose. To determine the change in the dynamic hardness of gypsum boards caused by exposure to high temperatures in order to establish the applicability of dynamic indentation of structures made from this material to assess the degree of thermal damage received in fire conditions.
Methods. Full-scale fire tests of gypsum boards. Dynamic indentation.
Findings. The possibility of assessing changes in the dynamic hardness of gypsum boards caused by exposure to elevated temperatures during a fire using the dynamic indentation method has been confirmed. Based on the fire tests of a frame-sheathing partition using a gypsum board of type H on a steel frame, the results of determining the change in the dynamic hardness of a gypsum board of the specified type are presented. In addition to the maximum temperature on the surface of the gypsum board, the heating time has a significant influence on the change in the indentation depth of the indenters. It was established that in different areas of the material surface at values of maximum (120–130 °C) and average (104–115 °C) temperatures and different heating times, the value of the indentation depth of the indenter differs by 1.5–2.0 times.
Application field of research. The obtained research results can be applied in the development a method for identifying the source of a fire based on the degree of thermal damage to structures made using gypsum boards.
References
Megorskiy B.V. Metodika ustanovleniya prichin pozharov [Methodology for identifying the causes of fires]. Moscow: Stroyizdat, 1966. 347 p. (rus).
Cheshko I.D. Tekhnicheskie osnovy rassledovaniya pozharov [Technical basics of fire investigation]: tutorial. Moscow: VNIIPO, 2002. 330 p. (rus).
Surikov A.V., Zaynudinova N.V., Boyko V.P. Perspektivnye metody otsenki stepeni poluchennykh v usloviyakh pozhara termicheskikh povrezhdeniy konstruktsiy, vypolnennykh s primeneniem gipsovykh plit [Promising methods for assessing the degree of thermal damage obtained under fire conditions made with the application of gypsum boards]. Journal of Civil Protection, 2022. Vol.6, No. 4. Pp. 400–414. (rus). DOI: https://doi.org/10.33408/2519-237X.2022.6-4.400. EDN: https://elibrary.ru/ZYWQWU.
Surikov A.V., Zaynudinova N.V., Boyko V.P., Garaev Yu.V. Otsenka vozmozhnosti primeneniya dinamicheskogo indentirovaniya gipsovykh plit dlya ustanovleniya stepeni poluchennykh v usloviyakh pozhara termicheskikh porazheniy konstruktsiy [Evaluation of the possibility of using dynamic indentation of gypsum boards to determine the degree of thermal damage to structures received under fire conditions]. Journal of Civil Protection, 2023. Vol.7, No. 2. Pp. 164–177. (rus). DOI: https://doi.org/10.33408/2519-237X.2023.7-2.164. EDN: https://elibrary.ru/KWSHQS.
Gorbett G.E., Morris S.M., Meacham B.J., Wood C.B. A new method for the characterization of the degree of fire damage to gypsum wallboard for use in fire investigations. Journal of Forensic Sciences, 2015. Vol. 60, Iss. s1. Pp. 193–196. DOI: https://doi.org/10.1111/1556-4029.12616.
Volosach A.V., Gorovykh O.G. Rezul'taty eksperimental'nykh issledovaniy poverkhnostnoy tverdosti yacheistykh betonov, podvergshikhsya temperaturnomu vozdeystviyu, indentorami s uglami rastvora konusa 20–55° [Results of experimental researches of surface hardness of cellular concretes exposed to temperature by indentors having 20–55° angles of cone opening]. Journal of Civil Protection, 2019. Vol. 3, No. 1. Pp. 13–22. (rus). DOI: https://doi.org/10.33408/2519-237X.2019.3-1.13. EDN: https://elibrary.ru/YZVGBF.
Published
How to Cite
License
Copyright (c) 2024 Surikov A.V., Zaynudinova N.V., Garaev Y.V.
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
