Analysis of the physical characteristics and mechanical properties of the coating mortar with the insertion of wood residues

ABSTRACT

Wood, besides being a renewable material, has several properties that make it very attractive compared to other materials, among which the good thermal insulation characteristics stand out. Since civil construction is a sector with a high consumption of natural resources, any action proposed to reduce the impact of civil construction on the environment contributes to sustainable development. This work consists in replacing the small aggregate with wood waste in air-games and analyze its physical characteristics and mechanical property. The trace used in the study as reference was 1:5 (cement: sand), in mass, and a substitution percentage of 0, 2.5, 5.0 and 10.0% was adopted. To be used in the mixture, the wood residue was submitted to a chemical treatment. Afterwards, its influence was verified in the consistency index tests, determination of water retention and mass density in the fresh state and water absorption by capillarity, capillarity coefficient, real specific mass, void index, tensile strength in bending and axial compression in the hardened-cido state. Besides these, a test was also performed in order to obtain a comparative analysis between the com-positions about the thermal insulation capacity of each one. Based on the results obtained, it was found that the characteristics of the mortars with substitution of the small aggregate for wood residue, indifferent to the percentage of substitution, showed positive values in the rheological characteristics of the mortar and in the hardened state almost similar to the mortar without residue insertion. Regarding the thermal insulation test, all compositions with wood residue showed a better result when compared with the reference mixture.

Keywords
wood residue; mortar; thermal comfort; sustainability