INFLUENCE OF CHEMICAL ADMIXTURES AND OF PRE-TREATMENT IN WOOD-CEMENT COMPOSITES
Palavras-chave:
Sawdust, Portland cement, Waste, Calcium hydroxide, Admixtures.Resumo
The purpose of this study was to verify the influence of two chemical admixtures on the properties of composites produced with Portland cement and Pinus spp. sawdust pretreated or not with calcium hydroxide suspension. The composites were produced with cement:wood ratio of 1:0.75 and a water/cement ratio of 0.50, containing superplasticizer admixture or air-entraining agent. Three mixtures were prepared with sawdust pretreated with 1:6 ratio of lime:water suspension (by mass). The bulk density of fresh composite was determined and prismatic specimens were produced. The results indicated that the composites produced in this study can be considered as lightweight composites (720 to 880 kg/m3) with flexural strength between 0.5 and 3.2 MPa and compressive strength between 1.4 and 7.0 MPa. From the mechanical results, it can be concluded that wood-cement composites, except those produced with sawdust pretreated and containing air-entraining agent, presented viability for production.
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