Avaliação da resistência de aderência á tração de argamassas de revestimento sobre diferentes substratos na cidade de Guaporé/RS
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Data
2018-02-28
Autores
Orientador
Mascolo, Rafael
Banca
Neto, Antonio Pregeli
Rosa, Ivandro Carlos
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Resumo
O presente trabalho direciona-se a uma área muito empregada na construção civil brasileira, o estudo de revestimentos argamassados com aplicação em substratos de concreto e alvenaria. Um dos motivos que induziu a realização deste estudo se dá a frequentes ocorrências de manifestações patológicas relacionadas a este tipo de revestimento, principalmente no que refere-se a falhas de aderência. Dessa forma, esta pesquisa torna-se pertinente como forma de avaliar o desempenho mecânico dos revestimentos de argamassa na região de Guaporé/RS. Neste contexto, a pesquisa avaliou diferentes traços de argamassa de revestimento de diferentes obras da cidade de Guaporé/RS, a fim de correlacionar resistências de aderência, de tração na flexão, de compressão, regiões de ruptura e as variações na composição do revestimento, através de ensaios em laboratório. Utilizou-se como base de parâmetro de desempenho requerido, as Normas Brasileiras, NBR 5739/1994, NBR 13276/2016, NBR 13277/2005, NBR 13278/2005, NBR 13279/2005, NBR 13528/2010 e NBR
15259/2005. Foram reproduzidos quatro traços utilizados em obras da cidade e um traço referência baseado em bibliografias na área. Quanto à composição da argamassa, variações nos insumos/materiais (cimento, cal, areia e água) e nas suas proporções foram estabelecidas, conforme cada obra. Os resultados apresentaram
desempenho inferior nos traços mais pobres, com maiores teores de agregado e cal. No que condiz ao revestimento, uma análise mediante a presença e ausência de chapisco, em substratos de cerâmica e a aplicação de argamassas com chapisco convencional e desempenado em substratos de concreto, foi realizada, apresentando grande variabilidade nas resistências obtidas. De modo geral, em bases cerâmicas
com chapisco, observou-se um resultado satisfatório de aderência, sendo o único a atender o mínimo exigido por norma, de 0,30 MPa.
The present study will be focused on an area that is often used in the Brazilian civil construction, the study of mortar coatings with application on substrates of concrete and masonry. One of the reasons that led to this study is the frequent pathological occurrences related to this type of coating, especially with regard to adherence failures. Therefore, this research becomes pertinent as a way of evaluating the mechanical performance of the mortar coatings in the region of Guaporé/RS and thus proposing improvements when necessary. In this context, the research consisted of collecting materials from different traits of Guaporé/RS to correlate resistance to adherence, resistance to traction on flexion and compression, fracture zones, water absorption and variations in coating composition, through laboratory tests. The Brazilian Standards NBR 5739/1994, NBR 13276/2016, NBR 13277/2005, NBR 13278/2005, NBR 13279/2005, NBR 13528/2010 e NBR 15259/2005 were used as the basis of required performance parameter. Four traits used in construction works in the region of Guaporé/RS and a reference trait based on bibliographic references in the area were reproduced. As for the mortar composition, variations in the inputs/materials (cement, lime, sand and water) and in their proportions were established, according to each construction work. The results presented worse performance in the poorest traits, with higher levels of aggregate and lime. As regards to the coating, an analysis through the presence and absence of roughcast on ceramic substrates and the application of mortar with conventional roughcast and laid on concrete substrates was performed, presenting great variability in the obtained resistances. In general, a satisfactory adherence result was observed in ceramic bases with roughcast, being the only one to attend the minimum required by standard of 0.30 MPa.
The present study will be focused on an area that is often used in the Brazilian civil construction, the study of mortar coatings with application on substrates of concrete and masonry. One of the reasons that led to this study is the frequent pathological occurrences related to this type of coating, especially with regard to adherence failures. Therefore, this research becomes pertinent as a way of evaluating the mechanical performance of the mortar coatings in the region of Guaporé/RS and thus proposing improvements when necessary. In this context, the research consisted of collecting materials from different traits of Guaporé/RS to correlate resistance to adherence, resistance to traction on flexion and compression, fracture zones, water absorption and variations in coating composition, through laboratory tests. The Brazilian Standards NBR 5739/1994, NBR 13276/2016, NBR 13277/2005, NBR 13278/2005, NBR 13279/2005, NBR 13528/2010 e NBR 15259/2005 were used as the basis of required performance parameter. Four traits used in construction works in the region of Guaporé/RS and a reference trait based on bibliographic references in the area were reproduced. As for the mortar composition, variations in the inputs/materials (cement, lime, sand and water) and in their proportions were established, according to each construction work. The results presented worse performance in the poorest traits, with higher levels of aggregate and lime. As regards to the coating, an analysis through the presence and absence of roughcast on ceramic substrates and the application of mortar with conventional roughcast and laid on concrete substrates was performed, presenting great variability in the obtained resistances. In general, a satisfactory adherence result was observed in ceramic bases with roughcast, being the only one to attend the minimum required by standard of 0.30 MPa.
Descrição
Palavras-chave
Revestimentos de Argamassa; Substratos de concreto e alvenaria; Chapisco; Diferentes traços
Citação
SALVI, Chanalisa Ruggini. Avaliação da resistência de aderência á tração de argamassas de revestimento sobre diferentes substratos na cidade de Guaporé/RS. 2017. Monografia (Graduação em Engenharia Civil) – Universidade do Vale do Taquari - Univates, Lajeado, 06 dez. 2017. Disponível em: http://hdl.handle.net/10737/1920.