Component Compositions of Mixtures of Cement-Wood Heat-Insulating Material

Abstract

AbstractThe research object is a cement-based heat-insulating material with wood waste. The preparation of wood-cement mixtures was carried out using the selected technological parameters by dispersing in a vibro-rotary mill of periodic action. The aim of the study is to establish the dependence of the physical and technical properties (a thermal conductivity coefficient, compressive strength and density) of cement heat-insulating material on the ratio of the components of mixtures with sawdust.The research was carried out by the method of experiment planning, taking into account the interpolation capabilities of the models. Based on the results of the experiment, mathematical models were constructed and graphs of the dependence of the thermal conductivity coefficient and compressive strength on the sawdust/cement and water/cement ratios were presented with constant sand/cement and lime/cement ratios. It was found that with an increase in the content of sawdust in the mixture (sawdust/cement ratio is in the range from 0.25 to 0.75), the strength of the samples significantly decreases (up to 64%), and the coefficient of thermal conductivity decreases on average by 15%. Compositions of mixtures with given values ​​of the thermal conductivity coefficient have been selected, having compressive strength indicators in the range from 0.4 to 1.1 MPa, which make it possible to obtain heat-insulating wood-cement materials. Possible areas of application of these cement heat-insulating materials with the use of wood waste have been determined: insulation of floor of the ground floor, wall and partition blocks.KeywordsCement heat-insulating materialsWood-cement compositesWoodworking wasteThermal conductivity coefficient