Abstract
This article describes equations derived to predict the duration of local pyrolytic charring under standard fire conditions. The equations consist of five variables: electrical capacity, electrical conductivity, calorific value, depth and rate of char. The equations are split up into two groups: one for the formation of non-impregnated carbonaceous residue, and one for impregnated carbonaceous residue during pyrolysis. This means that before predicting the local duration of charring, it is necessary to determine whether the wood has been impregnated with a fire retardant solution before the fire. Electrical conductivity and electrical capacity measurement methods were used for this purpose. The temperature of standard fire local exposure is calculated by predicting the duration of local pyrolytic charring according to the standard temperature and the time dependence of fire.
Highlights
Wood is a material used in many areas: technique, technologies and especially in construction engineering and its products
Data from previous studies has shown that flame retardants affect the values of the electrical conductivity and the electrical capacity, and so these methods can be used to determine the impregnation of wood (Mačiulaitis et al 2015)
Statistical data processing A mathematical model with a breakpoint was used to determine the relationship between the duration of local wood charring under a modelled standard fire curve with an electrical capacity, electrical conductivity, calorific value, charring depth, and rate
Summary
Wood is a material used in many areas: technique, technologies and especially in construction engineering and its products. 5. The charring rate (β, mm/min) of a wooden structure is calculated at each location of sampling according to the following equation:. Parameter w of the moisture content of wood is used in Eqn (5) of the GTC/GT 5 methodology (2006) to calculate β, and it is not possible to determine it accurately and locally in the fire and pyrolysis zone, where the fire is extinguished using water or foam This method does not evaluate experimentally whether the wood has been impregnated against fire with flame retardant solutions or not. Data from previous studies has shown that flame retardants affect the values of the electrical conductivity and the electrical capacity, and so these methods can be used to determine the impregnation of wood (Mačiulaitis et al 2015). The aim of the work is to derive prediction equations for local pyrolytic char duration and, according to them, to predict the standard fire local temperature
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