Dissertações em Engenharia Civil (Mestrado) - PPGEC/ITEC
URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/2304
O Mestrado Acadêmico foi aprovado pela CAPES em 1999 e inicou-se em 2001 pertente ao Programa de Pós-Graduação em Engenharia Civil (PPGEC) do Instituto de Tecnologia (ITEC) da Universidade Federal do Pará (UFPA).
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Item Acesso aberto (Open Access) Análise mecânica e microestrutural da interação do bambu com o concreto(Universidade Federal do Pará, 2018-04-03) SALGADO NETO, Francisco de Souza; PICANÇO, Marcelo de Souza; http://lattes.cnpq.br/4535052395600357Several materials have been used in construction, steel and concrete being the most used. However, such materials present high production costs and generate great impacts to the environment. The purpose of this research is to analyze the interaction between concrete and bamboo of the species Dendrocalamus giganteus as well as to verify the potential of the annealed wire as a reinforcement of bond between the above-mentioned materials, justified by the search for alternative and renewable materials concomitantly with the defense of sustainability. The experimental schedule is divided into 3 stages: morphological, physical and mechanical characterization of bamboo; concrete dosing; and study of bamboo concrete interaction, analyzing the use of two types of wrapping wire on the bamboo surface as a mechanism of bond reinforcement: single spiral and double spiral, from the determination of the bond strength at 28 days for each case, of the load x displacement behavior and the microstructural analysis of the concrete bamboo interaction. The fixed factors were: compressive strength of the concrete (28 MPa), 200 mm is the length of bonded interface, bamboo sticks with rectangular section of 20 mm x 10 mm. All the results obtained were analyzed by statistical tests and it was verified that the presence of the node and the use of wire increases the bond strength by 42% and at least 25%, respectively.Item Acesso aberto (Open Access) Avaliação de diferentes tratamentos de base aplicados sobre alvenaria de bloco cerâmico na aderência da argamassa: estudo de caso(Universidade Federal do Pará, 2011-10-28) SILVA, Cecília Rodrigues da; PAES, Isaura Nazaré Lobato; http://lattes.cnpq.br/3432832117667434This paper discusses, in a scientific way, the experimental study conducted to investigate the mechanism of adhesion of the mortar coating applied over masonry of ceramic blocks with different basic treatments, namely: (reference 1:3, cement and sand in volume - no cure, 1:3, cement and sand by volume - with healing, 1:3 + SBR additive, cement and sand by volume - no cure, 1:3 + SBR additive, cement and sand by volume - with healing). We adopted three different ages (7, 28 and 120 days) in order to verify the evolution of adhesion over time, both assessments being made on site (in situ) and additional tests in the laboratory. The determination of the tensile bond strength of mortar was facing as a parameter normative NBR 13528 (ABNT, 1995) and the results were subjected to statistical analysis of variance. Were also analyzed aspects related to the influence of both the pore structure of the plaster as the porous substrate adherence, through the techniques of mercury intrusion porosimetry, porosimetry by desorption of water vapor, scanning electron microscopy (SEM) and X-ray diffraction Based on the results obtained showed that the basic treatment, the continuous process of healing the lining damp and age are significant factors in bond strength as well, if you choose to use conventional Chapisco (1:3, cement: damp sand by volume), it becomes importantel the continuous process of healing (for a minimum of 48 hours). In case you choose to use the additive Chapisco, this should not be subjected to excessive moisture (moist cure).