Plasters with wood processing waste additives

Abstract

The paper assesses the influence of additives based on wood processing industry waste on the physical and mechanical properties of plasters. As additives to the plaster, the bark and sawdust of Scots pine were used, previously crushed and purified from extractive and easily hydrolysable substances. Extraction of extractive substances from wood processing waste was performed by hot water extraction. The content of additives was in the range from 1.5 to 6 % by weight of cement. The average density, compressive strength, flexural tensile strength, water absorption, and thermal conductivity were monitored for the obtained samples of plasters. As a result of the carried out experiments, it was found that the quantitative increase of the additive in the mixture reduces the density of the mortar, water absorption increases slightly, the coefficient of thermal conductivity and the tensile strength during bending decreases. The compressive strength increases with the addition of sawdust 1.5 %, in other cases it decreases with the increase in the amount of the additive. It is shown that mortars with the addition of fine wood processing waste can be used as plasters with reduced thermal conductivity for interior work.