Influence of fissures in timber on the charring rate

2019 ◽  
pp. 229-234
Author(s):  
J. Sandanus ◽  
Z. Kamenická ◽  
P. Rantuch ◽  
J. Martinka ◽  
K. Balog
Keyword(s):  
Charring Rate

Predicting charring rate of woods exposed to time-increasing and constant heat fluxes

2008 ◽  
Vol 81 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Yang Lizhong ◽  
Zhou Yupeng ◽  
Wang Yafei ◽  
Guo Zaifu
Keyword(s):  
Heat Fluxes ◽  
Constant Heat ◽  
Charring Rate

Behavior of the Spruce and Birch Wood from the Fire Safety Point of View

2013 ◽  
Vol 842 ◽  
pp. 725-728 ◽  
Author(s):  
Petr Kučera ◽  
Antonín Lokaj ◽  
Vladimír Vlček
Keyword(s):  
Heat Flux ◽  
Carbon Monoxide ◽  
Flux Density ◽  
Fire Safety ◽  
Maximum Concentration ◽  
Heat Flux Density ◽  
Point Of View ◽  
Birch Wood ◽  
Char Layer ◽  
Charring Rate

In the presented paper is comprehensively assessed the behavior of spruce and birch wood during fire. Samples were loaded by heat flux of 20, 35 and 50 kW/m2in apparatus according to ISO 5657. The duration of the test was up to 30 min. The behavior of the samples was evaluated on the basis of charring rate and concentrations of carbon monoxide in smoke. Charring rate was rising with increasing heat flux density and decreasing linearly with increasing density of the samples. The maximum concentration of CO in the smoke for spruce and birch wood was observed just before the end of the test, during the phase of char layer burning.

scholarly journals Experimental Investigation of the Effect of Heat Flux on the Fire Behavior of Engineered Wood Samples

Fire ◽  
2020 ◽  
Vol 3 (4) ◽  
pp. 61
Author(s):  
Denis Kasymov ◽  
Mikhail Agafontsev ◽  
Vladislav Perminov ◽  
Pavel Martynov ◽  
Vladimir Reyno ◽  
...  
Keyword(s):  
Heat Flux ◽  
Oriented Strand Board ◽  
Fire Hazard ◽  
Construction Materials ◽  
The Body ◽  
Main Function ◽  
Fire Retardants ◽  
Entire Process ◽  
Study Results ◽  
Charring Rate

This paper presents the experimental study results on the effect of heat flux emitted by a standard source on the charring and ignition characteristics of wood construction materials (plywood, chipboard, and oriented strand board) using infrared thermography (IRT) in the narrow spectral ranges of infrared wavelength. The time to ignition (TTI), charring rate and depth were obtained for the samples. In addition, the effect of several fire retardants on the charring rate and depth of the samples and TTI was analyzed. All fire retardants contribute to an increase in TTI, which confirms their main function—fire protection. However, the effect of fire retardants differs noticeably depending on the material. A new experimental technique is suggested, with the infrared imaging of the temperature distribution along the end of a sample under the heat flux effect on its frontal surface. The uniqueness of this approach consists in the registration of the entire process of ignition and combustion of the presented materials, which occurs in real time without contact with high spatial and temporal resolution. Using the infrared camera of the research class, it becomes possible to record the entire process from the occurrence of the temperature exposure region to the deep carbonized crater in the body of the material. The results can serve as additional recommendations in the development of fire hazard testing methods for construction materials and fire retardants.

scholarly journals Experimental study of the charring rate of tropical hardwoods

2004 ◽  
Vol 28 (1) ◽  
pp. 15-24 ◽  
Author(s):  
Jacques Michel Njankouo ◽  
Jean-Claude Dotreppe ◽  
Jean-Marc Franssen
Keyword(s):  
Experimental Study ◽  
Charring Rate

scholarly journals THE BEHAVIOUR OF SPECIAL OSB BOARDS UNDER FIRE CONDITIONS, The influence of OSB board´s fire coating on the fire resistance of light timber frame assemblies

2016 ◽  
Author(s):  
Petr Kuklík ◽  
Magdaléna Charvátová
Keyword(s):  
Fire Resistance ◽  
Fire Test ◽  
Test Laboratory ◽  
Fire Tests ◽  
Load Bearing ◽  
Timber Frame ◽  
Charring Rate ◽  
Fire Conditions

The paper is focused on the influence of fire resistant coatings used on OSB boards on the fire resistance of entire light timber frame wall assemblies. Two fire tests were performed in the fire test laboratory of PAVUS, a.s. in Veselí nad Lužnicí. The fire tests were performed on a load bearing wall. The wall dimensions were 3.0 (depth) x 3.0 (height) m. According to EN 1995-1-2, the calculation for fire paints and coatings is not possible. The aim of the paper is the determination of the influence of this type of coating on the OSB board’s charring rate, the determination of the start of charring of a timber stud and the fire resistance of the whole construction.

The charring rate and charring depth of bamboo scrimber exposed to a standard fire

2018 ◽  
Vol 42 (7) ◽  
pp. 750-759 ◽  
Author(s):  
Ming Xu ◽  
Zhaoyan Cui ◽  
Zhongfan Chen ◽  
Jinhua Xiang
Keyword(s):  
Standard Fire ◽  
Charring Rate ◽  
Bamboo Scrimber

Fire performance, including the cooling phase, of structural glued laminated timber beams

2016 ◽  
Vol 7 (4) ◽  
pp. 349-364 ◽  
Author(s):  
H. Kinjo ◽  
T. Hirashima ◽  
S. Yusa ◽  
T. Horio ◽  
T. Matsumoto
Keyword(s):  
Temperature Distribution ◽  
Maximum Load ◽  
Strength Reduction ◽  
Fire Performance ◽  
Load Bearing ◽  
Content Type ◽  
Standard Fire ◽  
Glued Laminated Timber ◽  
Charring Rate ◽  
Cooling Phase

Purpose Based on heating tests and load-bearing fire tests, this paper aims to discuss the charring rate, the temperature distribution in the section and the load-bearing capacity of structural glued laminated timber beams not only during the heating phase during a 1-h standard fire in accordance with ISO 834-1 but also during the cooling phase. Design/methodology/approach Heating tests were carried out to confirm the charring rate and the temperature distribution in the cross-section of the beams. Loading tests under fire conditions were carried out to obtain the load-deformation behavior (i.e. the stiffness, maximum load and ductility) of the beam. Findings The temperature at the centroid reached approximately 30°C after 1 h and then increased gradually until reaching 110-200°C after 4 h, during the cooling phase. The maximum load of the specimen exposed to a 1-h standard fire was reduced to approximately 30 per cent of that of the specimen at ambient temperature. The maximum load of the specimen exposed to a 1-h standard fire and 3 h of natural cooling in the furnace was reduced to approximately 14 per cent. In case of taking into consideration of the strength reduction at elevated temperature, the reduction ratio of the calculated bending resistance agreed with that of the test results during not only heating phase but also cooling phase. Originality/value The results of this study state that it is possible to study on strength reduction in cooling phase for end of heating, timber structural which has not been clarified. It is believed that it is possible to appropriately evaluate the fire performance, including the cooling phase of the timber structural.

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