Análise térmica e mecânica de argamassas de revestimento com adição de vermiculita expandida em substituição ao agregado
The search for building materials that lead to advances, especially as regards to the aspect of energy efficiency of buildings, is increasingly constant nowadays. In Brazil, the NBR 15575 (2013) establishes the minimum standards about the efficiency of buildings in the country, bringing among criter...
Na minha lista:
| Autor principal: | |
|---|---|
| Outros Autores: | |
| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Brasil
|
| Assuntos: | |
| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/25165 |
| Tags: |
Adicionar Tag
Sem tags, seja o primeiro a adicionar uma tag!
|
| Resumo: | The search for building materials that lead to advances, especially as regards to the aspect of energy efficiency of buildings, is increasingly constant nowadays. In Brazil, the NBR 15575 (2013) establishes the minimum standards about the efficiency of buildings in the country, bringing among criteria of structural stability and useful life, the guidelines to obtain thermal and acoustic comfort, and fire safety. In this context, there is a growing number of studies aiming to investigate the use of lightweight aggregates, such as vermiculite, which has important properties, specifically low thermal conductivity and high fire resistance. Thus, the current research sought to evaluate the thermal performance of mortars in the 1: 1: 6 volume, with the addition of expanded vermiculite (superfine) in defined percentages of replacement to the small aggregate (25%, 50%, 75%, and 100%). The experimental procedure was initiated with the chemical, mineralogical, microstructural and thermal characterization of the vermiculite, and with its physical characterization and with the constituent sand. The analysis of the properties of workability, water retention, capillary absorption, porosity, and mechanical strength of each mixture was performed. In order to determine the energy efficiency of the coating, thermal characterization tests were carried out. In the results of the fresh and hardened state, it was observed that the mortars containing expanded vermiculite presented higher water consumption and retention, lower mass density, reduction of mechanical strength, and increased capillary absorption and index of voids. In the analysis of the thermal performance, it was observed that in ceramic brick sealing systems, whatever the mortars used, all adhered the thermal transmittance requirements, and only the mortar with 100% of vermiculite did not meet the established limit of thermal capacity. In the concrete block system, all were considered adequate for the thermal capacity limits, however, only 75% and 100% replacement mortars contributed with all the thermal transmittance requirements. Thus, it is indicated that the addition of expanded vermiculite results in mortars with good thermal performance, being that of 25% the most suitable for use as a coat because it was the one that presented the best thermomechanical results. |
|---|