ROCHA, V. P. T.; ROCHA, VICENTE P. T.; http://lattes.cnpq.br/2218294084835196; ROCHA, Vicente de Paula Teixeira.
Resumo:
The external coating of the masonry is an element of high importance for buildings, exerting
outstanding function related to sealing, finishing, thermal and acoustic insulation and
mechanical resistance, among others. However, a closer look is required regarding the thermal
insulation role that the wall covering can exert. The objective of this research was to evaluate
the influence of the coating of alternative mortars containing recycled rubber tires on the
thermal performance of masonry, and also carried out studies on the physical-mechanical
characterization of these alternative composites. Initially, the reference mortar was made in
the 1:5 trace (cement: sand), and later the natural aggregate was partially replaced by recycled
rubber in the percentages of 5, 10, 15, 20, 25%, making possible the study of six traces of
mortars. The tests were carried out for physical characterization in the fresh and hardened
state (consistency index, mass density and water absorption by capillarity) and for mechanical
characterization (resistance to axial compression, diametral compression traction and flexural
tensile strength). Experiments were carried out for thermal characterization of the mortar
(inertia and thermal conductivity). The results showed that the inclusion of recycled tire
rubber causes a reduction in mass density in the fresh and hardened state, as well as the
absorption of water by capillarity. It was also observed a strong reduction of the mechanical
strength of the alternative mortars containing tire rubber. As for the thermal characterization
analysis, it was found an inversely proportional relation between the coefficient of thermal
conductivity and the amount of tire rubber in the mortar. Through this research, it was
possible to conclude that the tire rubber helps the mortars to function as a good thermal
insulation, which contributes to an increase in the thermal comfort of the occupants of the
buildings. Observed that the greater the amount of tire rubber, the better the thermal
performance of the composites. The results make it possible to conclude that mortars,
containing tire rubber, make a valuable contribution to the masonry coating, making it
possible to use it in rural construction.