Studying the thermal characteristics and effectiveness of structural fire proofing made of PROSASK Firepanel cement boards by means of reproducing the high-temperature effect

Introduction. The application of PROZASK fire-retardant panels demonstrates an option for and the expediency of a comprehensive study of fire proofing characteristics.

Goals and objectives. The mission of this research project is to (1) obtain the results of experimental studies of fireproofing panels, containing the cement binder, (2) determine their fire proofing efficiency, using the radiant heating test bench that reproduces pre-set modes of high-temperature exposure, and (2) analyze the testing results using the method of mathematical modelling of temperature fields inside fireproof structures.

Methods. Standardized laboratory techniques were used to clarify the thermal-physical characteristics of boards at relatively low temperatures. Their fire proofing efficiency was evaluated in the course of additional testing of specimens using the radiant heating test bench. A reliable and relatively uncomplicated method and programme for calculating unsteady temperature fields in fireproof structures were used to conduct the thermal analysis and generalization of experimental results. The authors summarized the results of standardized tests, conducted in a fire furnace, to determine the flame-retardant efficiency of PROZASK Firepanel boards and the fire-resistance of the full-size structures they protect.

Results. Values of specific heat capacity and the thermal conductivity coefficient of boards, tested using  laboratory benches at relatively low temperatures, were verified. The results of thermocouple measurements, taken during the testing of specimens with the help of the radiant heating bench in standard and hydrocarbon temperature modes, were obtained. The processing of these results, using thermal engineering analysis, allowed determining the values of the thermal conductivity coefficient in the range of operating temperatures. The influence of moisture, contained in the boards, on their fire protection efficiency was evaluated. Comparison between the results of calculations and tests, conducted in the fire furnaces, showed the practical usability of the obtained characteristics of boards and the thermo-engineering analysis used to (1) clarify the fire-proofing efficiency and the design developed using PROZASK Firepanels and (2) evaluate the fire-resistance of the constructions they protect.

Conclusions. The presented integrated studies generated a considerable amount of important information, required to prognosticate the fire proofing properties and the fire-resistance of constructions that contain PROZASK Firepanels. The role of additional testing of specimens using a radiant heating test bench and the effectiveness of thermal-engineering calculations as a tool for assessing the parameters of fire proofing  and the fire resistance of structures are demonstrated.

1. Pekhotikov A.V., Pavlov V.V. Fire protection for steel structures, topical issues in their application, assessment of technical and operational characteristics. Promishlennie pokritia/Industrial coatings. 2015; 5­6:30­34. (rus).

2. Soskov A.A., Pronin D.G. Fire protection of steel structures. Industrial and Civil Engineering. 2015; 7:57­59. URL: https://elibrary.ru/item.asp?id=23851087 (rus).

3. Golovanov V.I., Pavlov V.V., Pekhotikov A.V. Engineering method for designing fire resistance of steel constructions protected by KNAUF­fireboard plates. Pozharnaya Bezopasnost’/Fire Safety. 2016; 3:171­179. URL: https://elibrary.ru/item.asp?id=26731725 (rus).

4. Golovanov V.I., Pavlov V.V., Pekhotikov A.V. Fire protection of steel structures with slab material PYRO­SAFE AESTUVER T. Pozharovzryvobezo pasnost/Fire and Explosion Safety. 2016; 25:60­70. (rus).

5. Gravit M., Antonov S., Nedryshkin O. Reserch features of tunnel lining with innovation fireproof panels. Procedia Engineering. 2016; 165:1651­1657. DOI: 10.1016/j.proeng.2016.11.906

6. Pronin D.G., Konin D.V. Problems of application of steel and reinforced concrete bearing structures for tall buildings with respect to their fire resistance. Pozharovzryvobezopasnost/Fire and Explosion Safety. 2018; 27(1):50­57. DOI: 10.18322/PVB.2018.27.01.50­57 (rus).

7. Korotkov R.V. Fire safety: fire protection of load­bearing metal structures of buildings. Bulletin of State Expertise. 2018; 1:46­47.

8. Golovanov V.I., Pekhotikov A.V., Pavlov V.V. Evaluation of fire­retardant effectiveness of coatings for steel structures. Pozharnaya Bezopasnost’/ Fire Safety. 2020; 4:43­54. DOI: 10.37657/vniipo. pb.2020.101.4.004

9. Gravit M.V., Shabunina D.E. Plaster compositions as fire protection of steel structures at oil and gas facilities. Fire and emergencies: prevention, elimination. 2022; 3:46­55. DOI: 10.25257/FE.2022.3.46­55

10. Polevoda I.I., Zhamoidik S.M., Nekhan D.S. Fire resistance of reinforced concrete columns with structural fire retardance. Pozhary i chrezvychaynyye situatsii: predotvrashcheniye, likvidatsiya/Fire and emergencies: prevention, elimination. 2022; 2:67­81. DOI: 10.25257/FE.2022.2.67­81

11. Garashchenko A.N., Danilov A.I., Antonov S.P., Marchenkova S.V., Pavlov V.V. The thermal analysis of fi re test results obtained for loaded cast iron tubing used to line subway tunnels, their rational fi re protection and pre­set fi re resistance. Pozharovzryvobezopasnost/Fire and Explosion Safety. 2022; 31(1):21­39. DOI: 10.22227/0869­7493.2022.31.01.21­39 (rus).

12. Garashchenko A.N., Antonov S.P., Danilov A.I., Pavlov V.V., Novikov N.S. Analyzing the fire performance of concrete columns and slabs under loading and using options, preventing explosive spalling to ensure the pre­set fire resistance. Pozharovzryvobezopasnost/Fire and Explosion Safety. 2022; 31(3):45­64. DOI: 10.22227/0869­7493.2022.31.03.45­64 (rus).

13. Kwon In­Kyu, Kwon Young­Bong. Experimental study on the fire resistance of steel columns protected with fire boards. International Journal of Steel Structures. 2012; 12:25­35. DOI: 10.1007/s13296­012­1003­4 URL: 13296­012­1003­4

14. Maraveas Ch., Vrakas A.A. Design of concrete tunnel linings for fire safety. Structural Engineering International. 2014; 24(3):319­329. DOI: 10.2749/101686614X13830790993041

15. Annerel E., Boch K., Lemaire T. Passive fire protection end life safety. Topic Safety of Tunnel and Undeground Structure. “SEE Tunnel: Promoting in SEE Region” ITA WTS 2015 Congress and 41st General Assambly. Dubrovnik, Croatia, 2015. 2015; 1­10.

16. SFPE Handbook of Fire Protection. Fifth edition. Hurley J. (Ed.). Morgan. Springer. 2016. DOI: 10.1007/978­1­4939­2565­0

17. The passive fire protection handbook. Chapter 3. Structual steel. Etex building performance. 2017; 71. URL: iteassets/construction/page­assets/.global/tools­services/fire­protection­handbook/promat­pfphchapter­3­structural­steel.pdf?v=49880e

18. Kowalski R. The use of Eurocode model of reinforcing steel behavior at high temperature for calculation of bars elongation in RC elements subjected to fire. Procedia Engineering. 2017. 193:27­34. DOI: 10.1016/j.proeng.2017.06.182

19. Novak S.V., Krukovsky P.G., Grigoryan N.B. Evaluation of the flame­retardant ability of the vermiculite­cement plate “Endotherm 210104” by standardized methods. Naukovij visnik: Civilnij zahist ta pozhezhna bezpeka/Scientific bulletin — Civil Protection and fire safety. 2017; 1(3):11­19. (rus).

20. Mahmud H.M.I., Mandal A., Nag S., Moinuddin K.A.M. Performance of fire protective coatings on structural steel member exposed to high temperature. Journal of Structural Fire Engineering. 2021; 12:193­211. DOI: 10.1108/JSFE­07­2020­0025

21. 蒋首超, 吴弘宸. 钢结构围护-防火一体化材料耐火性能试验研究. 建筑钢结构进展. 2021; 23(01):77­84. DOI: 10.13969/j.cnki.cn31­1893.2021. 01. 010 (Jiang S.,Wu H. An experimental investigationon the fire resistance of the integrated envelope­firе protection material for steel buildings. Progress of Building Steel Structure. 2021; 23:77­84. DOI: 10.13969/j.cnki.cn31­1893.2021.01.010). (chn).

22. Hua N., Khorasani N., Tessari A., Ranade R. Experimental study of fire damage to reinforced concrete tunnel slabs. Fire Safety Journal. 2022; 127:103504. DOI: 10.1016/j.firesaf.2021.103504

23. Zehfuß J., Sander L. Gypsum plasterboards under natural fire — Experimental investigations of thermal properties. Civil Engineering Design. 2021; 3(8):1­11. DOI: 10.1002/cend.202100002

24. Zhang C., Pintar A., Weigand J.M., Main J.A., Sadek F. Impact of variability in thermal properties of SFRM on steel temperatures in fire. Fire Safety Journal. 2021; 123:103361. DOI: 10.1016/j.firesaf.2021.103361

25. Novak S., Drizhdg V., Dobrostan O., Novak M. Influence of thermophysical characteristics of fire­retardant materials on the thermal state of steel columns under standard temperature regime Naukovij visnik: Civilnij zahist ta pozhezhna bezpeka — Scientific bulletin/ Civil Protection and fire safety. 2022; 1(13):88­110. DOI: 10.33269/nvcz.2022.1.88­110 (ukr).

26. Garashchenko A.N., Vinogradov A.V., Dashtiev I.Z., Kobylkov N.V., Terekhov S.A. Using a radiant heat test facility to study the options for the fire protection of structures involving coiled MBOR basalt fiber material. Pozharovzryvobezopasnost/Fire and Explosion Safety. 2020; 29(6):28­39. DOI: 10.22227/PVB.2020.29.06.28­39 (rus).

27. Garashchenko A.N., Vinogradov A.V., Kobylkov N.V., Nikolchenkin A.A., Antipov E.A. Experimental and computational modeling of fire and thermal protection composite materials under high­temperature exposure. Aviation Materials and Technologies. 2022; 3(68): 84­96. DOI: 10.18577/2713­0193­2022­0­3­84­96

28. Pronin D.G., Timonin S.A., Golovanov V.I. STO ARSS 11251254.001-018-03. Design of fi re protecting loaded steel constructions using different facings. Moscow, ARSS, 2018; 70. (rus).

29. Strakhov V.L., Garashchenko A.N., Kuznetsov G.V., Rudzinskii V.P. Software for simulation of temperature fields in fire resistant building constructions with taking into account the processes of thermal decomposition, intumescense – shrinkage and avaporation – condensation. Pozharovzryvobezopasnost/Fire and Explosion Safety. 2001; 10(4):9­11. (rus).

30. Strakhov V.L., Garashchenko A.N., Kuznetsov G.V., Rudzinskii V.P. High­temperature heat and mass transfer in a layer of moisture­containing fireproof material. High Temperature. 2000; 38(6):921­925. DOI: 10.1023/a:1004149625276

31. Volkov A.F., Roytman V.M., Pristupyuk D.N., Fedorov V.U. Influence of building materials humidity on heating calculation accuracy at fire protecting grade. Systemotechnique of building. Cyberphysique building systems : Collection of materials of the seminar held within the framework of the VI International Scientific Conference. Moscow, MGSU, 2018; 207­212. (rus).