Percorrer por autor "Gontijo, Guilherme Lopes"
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- Comportamento ao fogo de blocos ecológicos de solo-cimento com incorporação de resíduosPublication . Gontijo, Guilherme Lopes; Rodrigues, Conrado; Ferreira, Débora; Mesquita, L.M.R.; Cruz, Maria; Luso, EduardaTecnologias construtivas com elevado caráter sustentável vêm se tornando cada vez mais uma necessidade da sociedade atual. Neste contexto, métodos construtivos que valem-se de terra como matéria-prima, bem como o reaproveitamento de resíduos industriais, mostram-se em ascenção. Sendo assim, o presente trabalho tem por objetivo caracterizar o comportamento de blocos de terra compactados perante situações de incêndio. Para tal, utilizou-se tanto abordagens experimentais quanto modelagem computacional.
- Comportamento ao fogo de paredes de blocos de terra compactados (btc) com incorporação de resíduosPublication . Gontijo, Guilherme Lopes; Ferreira, Débora; Mesquita, L.M.R.; Luso, Eduarda; Cruz, Lurdes; Rodrigues, CarolDiante da crescente busca por métodos de construção sustentáveis, blocos de terra compactados (BTC) vêm se tornando uma alternativa cada vez mais utilizada em construções. Além de serem compostos majoritariamente por solo, os BTC oferecem ainda a possibilidade de inclusão de resíduos diversos em suas composições, o que resulta na redução de impactos ambientais [1]. Dentre os desafios da utilização desse material destaca-se a heterogeneidade e grande variabilidade entre os solos disponíveis, o que dificulta padronizações na execução e nas propriedades dos blocos. Desse modo, o presente trabalho tem por objetivo a avaliação do comportamento ao fogo de paredes de BTC, analisando influências da inclusão de resíduos. Para tal finalidade, recorre-se à análise experimental do fenómeno, por meio de ensaio em laboratório e simulação numérica do mesmo, via Método dos Elementos Finitos (FEM). Para realização dos ensaios experimentais, estão a ser executadas paredes de 1 m2 compostas por blocos de terra compactados assentados com argamassa. As paredes são submetidas a ensaios conforme o Eurocódigo 1364-1 [2], avaliando-se critérios de estanqueidade e isolamento. Paralalelamente à execução das paredes, estão a ser caracterizadas as propriedades térmicas dos BTC, de modo a permitir simulações computacionais que apresentem resultados condizentes àqueles observados em laboratório. Após a execução dos ensaios experimentais e das simulações computacionais, busca-se avaliar as influências da incorporação de resíduos orgânicos aos blocos quando submetidos ao fogo. Além disso, espera-se também identificar na caracterização das propriedades térmicas dos BTC as influências que a inclusão de resíduos pode causar no comportamento dos blocos, estabelecendo-se assim proporções e características adequadas do resíduo a ser incorporado.
- Fire behaviour of ecological soil-cement blocks with waste incorporation- experimental and numerical analysisPublication . Ferreira, Débora; Luso, Eduarda; Cruz, Maria; Mesquita, L.M.R.; Gontijo, Guilherme LopesThe increasing interest on earth construction as a sustainable building solution led to the development of modern earth construction techniques, in particular of masonry made of compressed earth blocks (CEBs). Soil is an abundant raw material, recyclable and reusable, noncombustible, non-toxic, with significant thermal behaviour and without too expensive transformation processes, which allows selecting this material as a major possibility for sustainable construction. The main goal of the present study is to assess the behaviour of soilcement blocks with incorporation of organic wastes. The problem of waste accumulation exists worldwide and has become a concern for today's society, leading to enormous environmental damage. One of the possibilities for reducing their environmental impact is the reuse of these wastes in new materials. However, incorporating wastes changes mechanical, physical and thermal properties of the new material. In order to evaluate the potential use of the wastes in blocks composition, laboratory tests were conducted and results were analysed [1]. This paper presents the fire behaviour of ecological soil-cement blocks with waste incorporation. At high temperatures, physical and mechanical changes were evaluated in the tested elements. Therefore, an experimental program was performed using samples of wall panel with soil-cement blocks. Previously, thermomechanical behaviour on cylindrical samples at different temperature ranges have been studied, [2]. The highest temperature tested was 600°C. The wall specimens under fire conditions were also analysed by a non-linear transient finite element numerical model, in time and temperature domains, and the numerical and experimental temperature fields compared.
- Fire behaviour of ecological soil–cement blocks with waste incorporation: experimental and numerical analysisPublication . Ferreira, Débora; Luso, Eduarda; Cruz, Maria; Mesquita, L.M.R.; Gontijo, Guilherme LopesThe main goal of this study is to assess the behaviour of soil–cement blocks with incorporation of organic wastes. The problem of waste accumulation exists worldwide and has become a concern in today’s society, leading to enormous environmental damage. One of the possibilities for reducing their environmental impact is the reuse of these wastes in new materials. However, incorporating waste changes the mechanical, physical and thermal properties of the new material. In order to evaluate the potential use of waste in blocks composition, laboratory tests were conducted and the results were analysed. This article presents the fire behaviour of ecological soil–cement blocks with waste incorporation. Therefore, an experimental programme was performed using samples of wall panel with soil–cement blocks. The wall specimen under fire conditions was also analysed by a non-linear transient finite element numerical model, in time and temperature domains, and the numerical and experimental temperature fields were compared
- Thermal behaviour of compressed earth blocks with municipal organic waste incorporationPublication . Gontijo, Guilherme Lopes; Ferreira, Débora; Mesquita, L.M.R.; Souza, Conrado Rodrigues deConstruction sector is one of the largest consumers of natural resources among human activities. Over the last years, with the increasingly interest for sustainable practices, the use of earth as a raw construction material re-emerged as a feasible way to reduce environmental impacts. In this scenario, compressed earth blocks (CEBs) arose as a construction technique with large sustainable potential, once they do not require cooking processes on their manufacture and due to the possibility of incorporation of fibres and wastes. This work aims to evaluate the incorporation of the organic fraction of municipal waste on CEBs, through its thermal properties and behaviour when subjected to fire situations. For such, a preliminary characterization of the CEBs to determine their porosity and bulk density was held. Subsequently, an evaluation of chemical aspects of the CEBs and its components was performed through thermogravimetric analyses. Thermal properties of the blocks were also calculated using transient methods. Finally, a CEBs panel was tested experimentally to evaluate criteria of integrity and insulation, and numerical simulations were held to provide a better understanding towards this phenomenon. The obtained results indicate that the incorporation of organic waste does not affect the capability of CEBs walls to accomplish fire safety criteria. Furthermore, the incorporated CEBs thermal properties still accomplish the minimums required by the standards and may also allow to reduce the heat transfer through building envelopes, which emphasize the sustainable feature of the blocks.