The Fire Protection Questions of the Thin Elements of The Roofs from the Aspen and Pine

The experimental research of questions about the influence of wood species on the duration of combustion of the smalldiameter aspen and pine samples was performed. Its surfaces were pre-treated with an aqueous solution of sodium liquid glass with a concentration of from 0% to 20% with step 1%. It is established that processing of samples shingles from aspen wood increases the duration of their complete combustion of from 89 s to 300 s (3.90 times). The same sample treatment shingles from pine wood increases the duration of their complete combustion of from 180 s to 700 s (3.37 times). For fire protection aqueous solution of sodium liquid glass with a concentration of 14% is more relevant. According to the results of the analysis, and in logical connection with known data from other studies, we found that the speed of combustion of samples of aspen than pine. The duration of the complete combustion of samples tested pine shingles without fire protection is 180 s. But the same in form and dimensions of the samples aspen shingles without fire protection only 89 s, this 180/89=2.02 times less. In addition, we have established that the duration of the complete combustion of samples of pine shingles with fire protection 700 s, and aspen shingles with the same fire protection only 300 s, i.e. in 2.33 times less. For explanation of the differences found formulated the hypothesis: per unit mass, the duration of the stage of pyrolysis, and hence combustion is proportional to the amount of extractable substances contained in the wood. The physical adequacy of the initial hypothesis and the reliability of the numerical results were confirmed by consistency with the measurement of the time complete combustion of aspen and pine specimens with fire protection of the surface.