Research of pyrolitic charring mechanism in natural and fire retardant treated pine wood

Abstract

There is a number of various fire retardant solutions created worldwide, however, performance research has not been carried out in detail for all of them. Furthermore, the process of wood combustion and charring is further impeded by different environmental conditions forming during fire. The work covers the thermogravimetric, microscopic and EDS research in different environmental conditions. Based on the thermogravimetric research it was determined that there had been three exo-effects recorded in the DTA curve for natural pine in the air medium, whereas for natural pine wood in the nitrogen medium and natural pine treated with BAK-1 both in the air and nitrogen media there had been six exo-effects recorded. Based on the EDS research it was determined that in the residue of both, natural and treated pine produced in the nitrogen environment, the amount of oxygen had been lower and the amount of carbon had been higher compared to the residue produced in the air environment, which means that processes in the nitrogen environment take place using the oxygen present in the wood composition, and oxidation of char in the air medium takes place in a more intensive manner. This is partially confirmed by the microscopic (SEM) research of the pine char residue.