Avaliação dos ciclos de alteração acelerada da NBR 12696/1992 para rocha granítica
Rock materials used in the construction industry tend to change naturally over time, a process that can be accelerated when exposed to polluted environments or aggressive weather conditions. Therefore, the characteristics that has to be studied more deeply must be defined according to the mode of us...
| Autor principal: | Cavalari, Aline Luana |
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| Formato: | Trabalho de Conclusão de Curso (Graduação) |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2020
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/15681 |
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| Resumo: |
Rock materials used in the construction industry tend to change naturally over time, a process that can be accelerated when exposed to polluted environments or aggressive weather conditions. Therefore, the characteristics that has to be studied more deeply must be defined according to the mode of use of each type of rock. In these studies it is important to consider the alteration and alterability analysis related to the geological and geotechnical properties of the rocks and the aggressiveness of the exposure environment. To investigate these parameters in laboratory were made accelerated cycling tests by variations of humidity and temperature (wet-draw cycling) and with the use of ethylene glycol. These tests are influenced by rock mineralogy and the chemical reaction of minerals with saturation liquid (water or reagents). Based on that, the present study analyzed the alterability of granites from the region of Piraquara-PR, in order to search for wet-draw cycles correlated with the physical characteristics of the rock. Thus, were performed tests such as water absorption rate, physical indexes (apparent density, apparent porosity and water absorption) and accelerated cycling to optimize the cycles of NBR 12696/1992. The analyzed granite presented physical and mechanical parameters from good to excellent quality and very low alterability for all the methods used. The study also made it possible to verify the need to perform the water absorption rate test to obtain faster cycles, reducing the test time. The cycles suggested by this method achieved the desired result in half of the time, if compared to that obtained by NBR 12696/1992. |
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