Painéis cimento-madeira de Eucalyptus saligna com diferentes aditivos químicos e métodos de formação

Abstract

The aim of this work was evaluate the potential use of different chemical additives and methods of formation for wood-cement composites with Eucalyptus saligna clones. Portland cement type II-Z was used as mineral bonding and Calcium chloride (CaCl 2) and Magnesium chloride (MgCl 2) as accelerator of the cement hydration. The wood-cement panels were produced by the cold press method with dimensions of 50.5 × 38.5 × 1.5 cm, and by vibro-compaction densification with 35 × 7 × 1.5 cm. Both methods used a nominal density of 1.0 g/cm 3 and wood: cement ratio of 1:2.75. Main results: (I) Hydration tests showed that E. saligna wood is compatible with Portland cement type II; (II) Use of Calcium and magnesium chlorides at 3% in relation of the cement dry weight improve physical and mechanical properties of wood-cement composites produced by studied methods; (III) Composites produced by vibro-compaction densification presented lower density, higher dimensional stability and higher internal bond than composites produced by the traditional cold press method.