Strength Characteristics of Fiber Reinforced Concrete for Tunnel Structures in High Temperatures

Голованов, В. И.; Novikov, Nikolay; Pavlov, V. V.; Антонов, С. Н.

doi:10.25257/fe.2017.2.63-67

Cited by 3 publications

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“…The obtained dependences of thermophysical properties of concrete with domestic and imported polypropylene fibers on temperature increase make it possible to carry out calculations of heating of concrete structures with selected additives on a temperature regime of "standard fire". The conducted studies on the effect of temperature on the strength and thermal properties of concrete with addition of polypropylene fiber reinforcement can be used in calculation of the fire resistance of load-bearing and enclosing structures made of this type of fiber-reinforced concrete [8][9][10][11][12].…”

Section: Civil Engineering Research Journalmentioning

confidence: 99%

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2018

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Section: Civil Engineering Research Journalmentioning

confidence: 99%

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2018

CERJ

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Fire resistance of reinforced concrete tubings of underground structures with polypropylene fiber

Голованов

Pekhotikov

Novikov

et al. 2019

Požarovzryvobezopasnostʹ

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Âñåðîññèéñêèé íàó÷íî-èññëåäîâàòåëüñêèé èíñòèòóò ïðîòèâîïîaeàðíîé îáîðîíû Ì×Ñ Ðîññèè (Ðîññèÿ, 143903, ã. Áàëàøèõà Ìîñêîâñêîé îáë., ìêð. ÂÍÈÈÏÎ, 12) ÐÅÇÞÌÅ Ââåäåíèå. AEåëåçîáåòîííûå êîíñòðóêöèè èç òÿaeåëîãî áåòîíà ïîâûøåííîé âëàaeíîñòè (áîëåå 3,5 %) èìåþò ñêëîííîñòü ê âçðûâîîáðàçíîìó ðàçðóøåíèþ, êîòîðîå ìîaeåò ïðèâåñòè ê ïðåaeäåâðåìåííîìó íàñòóïëåíèþ ïðåäåëà îãíåñòîéêîñòè òàêèõ êîíñòðóêöèé è ÷àñòè÷íîìó èëè ïîëíîìó îáðóøåíèþ çäàíèé è ñîîðóaeåíèé. Ïîâûøåííàÿ âëàaeíîñòü aeåëåçîáåòîííûõ êîíñòðóêöèé îáû÷íî âñòðå÷àåòñÿ â ïîäçåìíûõ ñîîðóaeåíèÿõ è âî âíîâü âîçâîäèìûõ çäàíèÿõ. Îãíåñòîéêîñòü aeåëåçîáåòîííûõ òþáèíãîâ ïîäçåìíûõ ñîîðóaeåíèé â çíà÷èòåëüíîé ñòåïåíè çàâèñèò îò âçðûâîîáðàçíîãî (õðóïêîãî) ðàçðóøåíèÿ áåòîíà ïðè âîçäåéñòâèè âûñîêèõ òåìïåðàòóð ïîaeàðà íà ïîâåðõíîñòü îáäåëêè òîííåëÿ. Ìàòåðèàëû è ìåòîäû. Â êà÷åñòâå îáúåêòà èññëåäîâàíèÿ áûëè âûáðàíû aeåëåçîáåòîííûå òþáèíãè èç òÿaeåëîãî áåòîíà âëàaeíîñòüþ 6 % ñ äîáàâêîé ïîëèïðîïèëåíîâîé ôèáðû â êîëè÷åñòâå 1 êã/ì 3 . Ïðîâåäåíû êðóïíîìàñøòàáíûå îãíåâûå èñïûòàíèÿ íà ñïåöèàëüíî èçãîòîâëåííîì ñòåíäå ïðè íàãðóaeåíèè îáðàçöîâ âåðòèêàëüíîé è ãîðèçîíòàëüíîé íàãðóçêîé. Ðåçóëüòàòû è îáñóaeäåíèå. Ïðåäñòàâëåíû îñíîâíûå ðåçóëüòàòû ýêñïåðèìåíòàëüíîãî èññëåäîâàíèÿ îãíåñòîéêîñòè aeåëåçîáåòîííûõ òþáèíãîâ ñ äîáàâêîé ïîëèïðîïèëåíîâîé ôèáðû è áåç íåå. Ïî ðåçóëüòàòàì óñòàíîâëåíî, ÷òî ïðåäåë îãíåñòîéêîñòè aeåëåçîáåòîííîãî òþáèíãà ñ äîáàâêîé ïîëèïðîïèëåíîâîé ôèáðû ñîãëàñíî ÃÎÑÒ 30247.0-94 ñîñòàâèë íå ìåíåå 125 ìèí (REI 120). Ðàçðàáîòàíà àíàëèòè÷åñêàÿ ìîäåëü îöåíêè îãíåñòîéêîñòè. Äëÿ ðåøåíèÿ òåïëîòåõíè÷åñêîé çàäà÷è ïðîâåäåí ÷èñëåííûé ýêñïåðèìåíò ñ ïîìîùüþ ïðîãðàììíîãî êîìïëåêñà "ANSYS". Ïðåäëîaeåíà àíàëèòè÷åñêàÿ çàâèñèìîñòü îïðåäåëåíèÿ äîïîëíèòåëüíîãî òåìïåðàòóðíîãî ïðîãèáà äëÿ ãåîìåòðè÷åñêè íåëèíåéíîãî ýëåìåíòà. Ðàñ÷åò ïðåäåëà îãíåñòîéêîñòè aeåëåçîáåòîííîãî òþáèíãà ñ äîáàâêîé ïîëèïðîïèëåíîâîé ôèáðû ïî ðàçðàáîòàííîé àíàëèòè÷åñêîé ìîäåëè ñ ó÷åòîì ðàíåå ïîëó÷åííûõ ïðî÷íîñòíûõ è òåïëîòåõíè÷åñêèõ õàðàêòåðèñòèê ïîäòâåðäèë ðåçóëüòàòû îãíåâûõ èñïûòàíèé: ïðåäåë îãíåñòîéêîñòè ñîñòàâèë REI 120. Çàêëþ÷åíèå. Èñïîëüçîâàíèå äëÿ îãðàaeäàþùèõ êîíñòðóêöèé òîííåëÿ aeåëåçîáåòîííûõ òþáèíãîâ èç ôèáðîáåòîíà ñ ïîëèïðîïèëåíîâîé ôèáðîé ïîçâîëèò çíà÷èòåëüíî ñíèçèòü çàòðàòû íà óñòðîéñòâî îãíåçàùèòû è ñîêðàòèòü ñðîêè ñòðîèòåëüñòâà.Êëþ÷åâûå ñëîâà: ñòàíäàðòíûé òåìïåðàòóðíûé ðåaeèì ïîaeàðà; òåïëîòåõíè÷åñêàÿ çàäà÷à; ñòàòè÷åñêàÿ (ïðî÷íîñòíàÿ) çàäà÷à; âçðûâîîáðàçíîå (õðóïêîå) ðàçðóøåíèå áåòîíà; îáäåëêà òîííåëÿ.

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Analyzing the fire performance of concrete columns and slabs under loading and using options, preventing explosive spalling to ensure the pre-set fire resistance

Гаращенко¹,

Antonov²,

Данилов

et al. 2022

Požarovzryvobezopasnostʹ

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Introduction. The authors focus on preventing the explosive spalling of concrete and the fireproofing of reinforced concrete structures. The relevance of this issue is explained by the insufficient number of fire tests of such structures under loading and thermal engineering calculations, needed for an objective analysis of testing results.Goal and objectives. The authors analyze the results of a series of fire tests, involving concrete columns and slabs with and without polypropylene microfiber, if no fireproofing is applied, as well as the results of the same tests involving the same items fireproofed by plates or plaster.Methods. The fire resistance of full-scale specimens of concrete was evaluated according to a standardized testing in a fire furnace under loading. It encompasses additional thermocouple measurements used to make a thermal engineering analysis. The analysis entailed both one- and two-dimensional problem formulations, methods and programmes for the numerical computation of non-stationary temperature fields in fireproof structures.Results. New data, obtained in the course of the fire experiments, show the efficiency of the polypropylene microfiber used to prevent the explosive spalling of concrete. The fire resistance limit is R 120 and R 150 under constant static loading. The fire resistance limit of similar structures, fireproofed by PROSASK Firepanel plates or IGNIS LIGHT plaster, was demonstrated. The specimens show the efficiency of methods and programmes for the one- and two-dimensional numerical analysis of non-stationary temperature fields in fireproof structures. The calculation results are presented for various fireproofing options.Conclusions. The testing results and their thermal analysis represent important items of information necessary to ensure the fire safety and the pre-set fire resistance of concrete structures under loading. They can also be used to outline the development pattern of this experimental and theoretical research project. The efficiency of thermal engineering calculations as a tool for evaluating fire protection parameters and the fire resistance of concrete structures is demonstrated, also as an option to reduce the number of expensive fire tests.

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Strength Characteristics of Fiber Reinforced Concrete for Tunnel Structures in High Temperatures

Cited by 3 publications

References 0 publications

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Fire resistance of reinforced concrete tubings of underground structures with polypropylene fiber

Analyzing the fire performance of concrete columns and slabs under loading and using options, preventing explosive spalling to ensure the pre-set fire resistance

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