Navegando por Autor "NEVES, Paulo Henrique Lobo"

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Acesso aberto (Open Access)
Aplicação de madeiras amazônicas em elementos de madeira lamelada colada (MLC)
(Universidade Federal do Pará, 2023-03-16) NEVES, Paulo Henrique Lobo; MOUTINHO, Victor Hugo Pereira; http://lattes.cnpq.br/8464600937488553; MACEDO, Alcebíades Negrão; http://lattes.cnpq.br/8313864897400179
Timber is considered on the world stage as the primary building material of the 21st century. However, for this potential to be actualized, technologies for unfolding and using the raw material, such as Glued Laminated Timber (glulam), need to be disseminated and used in a wider range of species. In this regard, we emphasize that, despite the great existing diversity, only some studies are found to verify the potential use of Amazonian timber in glulam. This way, this paper aims to analyze the gluing of ten species native to the Amazon, namely: Jacaranda sp., Simarouba amara Aubl., Astronomium lecointei, Couratari sp., Cedrela fissilis., Cordia Goeldiana Huber, Hymenaea courbaril., Dipteryx odorata. Euxylophora paraensis., Mezilaurus itauba., and the combination with four different types of adhesives, two structural resistant to moisture and two non-structural, using a shear sample of solid timber as a evidence, with a minimum of 20 repetitions per treatment. Complementary tests such as delamination and static bending were carried out. We verified that for some species there was an adhesive with statistically equal and superior resistance in some combinations compared to the control sample, demonstrating that the studied species have the potential for the production of glulam, as well as for other products that use adhesives.
Acesso aberto (Open Access)
Caracterização dos agregados da região do baixo Amazonas: elaboração de traços para a produção de blocos de concreto estrutural
(Universidade Federal do Pará, 2015-07-03) NEVES, Paulo Henrique Lobo; MACEDO, Alcebíades Negrão; http://lattes.cnpq.br/8313864897400179
With the growing demand for aggregates for the construction industry in the city of Santarém and surrounding cities, and with the emergence of construction processes still little known in the region, such as the use of concrete blocks, the need to develop an experimental research for verification arises insusceptible of the characteristics of aggregates to be used in order to study the feasibility of applying them to the production of concrete blocks with structural function, class B – 4,0MPa ≤ fbk <8.00 MPa. A complete characterization, identification of exploration areas with their distances to block production sites in the city Santarém was approached. With the results were developed traits with the dry mixture of aggregates depending on their characteristics seeking to optimize and better compactness thereof, to more economic traits and which give the final product a better finish and resistance. The experiment was developed from a standard feature used in the city's factories and which served as a benchmark for the other elaborate experimental features, complying with the steps below. In the first stage was carried out to identify the aggregate producing sources in the city of Santarém and surrounding areas. Following a second stage, held expeditions collecting and packaging the samples. For the latest steps were carried out the characterization tests being: Kids grain size and coarse aggregates, mass determination and specifies apparent, fine materials and abrasion Los Angeles. Later traces were designed with optimized framework in the ideal particle size range, with the production of concrete blocks with structural function of families 14x29 and 14x39. In the last step tests were performed to verify the dimensional analysis, absorption index and resistance to compression individual blocks. Prior knowledge of the aggregates and framed adequate mixing in the ideal particle size range provided the reduction in the consumption of cement and favored the final product quality improving all its performance parameters.