Utilization of boon and chaff for manufacturing lightweight walling materials

Abstract

Lightweight composites for walls and thermal insulation, containing anhydrite (An) or aluminate cement (Al), vinyl acetate (VA) or cellulose (Cl) polymeric binders and cellulose fiber fillers (boon, chaff) were produced. The best results were obtained for transportation and construction of items containing: An ³ 30–45 %, Al ³ 30–50 %, VA ³ 1–5 %, Cl ³ 0,5–5,0 %, boon or chaff ³ 40–47 %. Polymeric binder VA for both kinds of cement is better than Cl. An is better for boon than for chaff. Aluminate cement is a good binder for both types of fiber fillers. Density r of a composite containing cements 50–60 % is less than 400 kg/m3. According to density such composite materials are light–weight heat–insulating materials. Density (r £ kg/m3) depends on the amount of cement content. Bending strength for samples with r £ 400 kg/m3, containing CMC is 0,6–1,3 MPa. Coefficient of thermal conductivity for samples, density with 400 kg/m3 is 0,06 W/m•K.