Study of thermal and mechanical properties of cementitious composites produced with residues from Porto Velho timber industry

ABSTRACT The main objective of this work was to evaluate cementitious composites with addition of waste from wood processing industry for use in construction as a thermal insulator. A matrix of pozzolanic Portland cement CP IV-32 was modified by partially replacing the cement with Metacaulinite (10%) and calcium hydroxide (Ca(OH)2) (5%), for setting control and compatibility with residues. Residues of 2.5%, 5.0% and 7.5% were added in partial replacement to the fine aggregate, compared to a conventional mixture. The thermal performance was developed through a heat retention box constructed with panels produced with mixtures in the specified percentages, being measured internal and external temperatures simultaneously for 30 minutes. The physical properties, compressive strength and 4-point bending were developed to verify the physical and mechanicalperformance of the components. The results showed a reduction in density and consumption of conventional materials, but the heat transfer between internal and external faces of panels presented statistically equivalent values, with coefficient of variation ≅ 18%, on analysed configuration. Metacaulinite and Ca(OH)2 presented improvements on physico-mechanical performance of composites, especially in the early ages.