Propriedades físicas, mecânicas e térmicas de argamassas de revestimento com utilização de resíduos de pneu

Abstract

The objective of this study was to evaluate the use of rubber particles and ash, obtained from rubber burning scrap tires as a reinforcement in mortar coating, applied in a single layer and reduction in heat transfer, aiming to improve their applications in thermal comfort of buildings and the mechanical properties of mortar. Percentages of 0%, 5%, 10%, 15% and 20% by volume of rubber particles were used in replacement of fine aggregate and 0%, 2.5%, 5% and 10% by volume of ash particles tire to replace the binder. Among the materials tested, the most suitable for use as thermal insulation was the one that had 20% of tire rubber particles in its formulation; however, this treatment had the greatest reductions in mechanical strength. Other treatments have excelled in thermal insulation, showing a low thermal conductivity, as in the case of treatments with 15% tire particles and all treatments with rubber tire ashes. Some proportions of ash cement mortars also behaved in a positive manner, like compressive strength. The potential use of the tire rubber ashes showed to be a partial replacement for Portland cement, and they can be used as a pozzolanic material. Tire rubber particles and tire rubber ashes presented lower densities, compared to the reference mortar. The increase in tire rubber particles to replace fine aggregates negatively impacted mortar workability, while increasing ash to replace binder improved workability.