Programa de Pós-graduação em Engenharia Civil
URI Permanente desta comunidade
Navegar
Navegando Programa de Pós-graduação em Engenharia Civil por Por Orientador "FIGUEIREDO, Enio José Pazini"
Agora exibindo 1 - 5 de 5
Resultados por página
Opções de Ordenação
Item GERENCIAMENTO DE PROJETOS PARA EDIFÍCIOS RESIDENCIAIS DE MÚLTIPLOS PAVIMENTOS: DIRETRIZES APROPRIADAS PARA COOPERATIVAS HABITACIONAIS AUTOGESTIONÁRIAS(Universidade Federal de Goiás, 2009-06-09) BARBOSA, Carlos Alberto de Jesus; FIGUEIREDO, Enio José Pazini; lattes.cnpq.br/4075543806767323Studies carried out by the United Nations (UN) show that a third of the population of the planet is suffering from the lack or inadequacy of dwellings and infra-basic structure. The deficit per dwelling is more serious in underdeveloped countries and developing countries, such as Brazil, and is becoming increasingly difficult to be solved without a great effort of the public, private initiative, financial institutions, education/research and associations on the basis of the various categories of work. As an alternative provision housing, has-if the participative management by mutual assistance, highlighting-if the housing cooperatives of auto-management. This program have presented high performance, where the works housing are being marketed and financed through this modality constructive, reducing the overall cost and increase the quality of the ventures. The mitigation of the overall cost of venture is a preponderant factor of success and survival of housing cooperatives of auto-management. The construction of residential buildings multiple floors enables the ventures housing cooperatives, because the high cost of developed land, usually with areas reduced, requiring increase the number of floors of the product for the better use of sites. The survival and servicing objectives of housing cooperatives of auto-management should consider four fundamental aspects: effectiveness in running (including the projects management), strong partnerships (with highlight to the public power, financial institutions , teaching/research, and other cooperative branches), existence of technical advice (from its constitution) and the target public (associated members with aware and motivated). Several studies identify that is in the projects management of the key to the reduction of waste of inputs and costs, with a gain in productivity and of the quality required to the final product. Considering the gaps in knowledge related to management of the project in the cooperative housing ventures, this study aims to investigate the main factors the quality of the production process, especially the stage of project of residential buildings with multiple floors built by the system of housing cooperatives of auto-management. As a result, the study provides some guidelines and tools for evaluating performance and quality of planning and control of the stage of project, from the studies of models, obtained by two aspects of phenomenological research. With the first vector seeks to at the literature national and international, models and tools for assessing the quality of project management, being more appropriate and would be appropriate for housing cooperatives of auto-management. Through the second vector investigated if, with the study of cases, two ventures of residential buildings multiple floors one in the city of Águas Claras DF, and another in the city of Goiânia GO, administered by housing cooperatives of auto-management. In these evaluated if the organizational structure, systems of an exchange of information, the weaknesses present and critical phases, planning and control the quality of the stage of project, the methodologies and tools of quality, in construction companies, design offices and between the intervening agents of the project process. It is concluded that the application management of the project in housing cooperatives of auto-management is a fundamental factor for survival,in implementing its main goal: to produce low cost housing and quality to their members.Item Influência da areia artificial oriunda da britagem de rocha granito-gnaisse nas propriedades do concreto convencional no estado fresco e endurecido(Universidade Federal de Goiás, 2007-10-31) CABRAL, Keillon Oliveira; FIGUEIREDO, Enio José Pazini; lattes.cnpq.br/4075543806767323The dissertation is aimed at the study being presented theoretical and experimental verification of the performance of artificial sand come from crushing the rock of granite-gneiss in relation to natural sand. Currently, the sand has artificially low commercial value of the market and is considered a "some kind of piece of marginal material ", whose purpose is not defined and remained stored in the courtyards of the quarries, forming huge piles that cause various environmental impacts. In addition to this, the traditionalism and the lack of information has led to an unwarranted mystification of this material. The methodology used for the tests of the research was based on standardized tests, which attempt to meet the objectives of the dissertation, in addition to enhancing the development of techniques to search for alternative aggregates. This has examined the influence of artificial sand in place of natural sand, with different proportions, and focuses on quality of the concrete in plastic and hardened its phases, taking into account the mechanical, elastic, physicalchemical, environmental and economic. The work was to characterize the material that composed the concrete studied. After this phase, were up corpses-of-proof concrete, using 15 (fifteen) different traits, so that the natural sand was gradually replaced by artificial sand, in proportions of 25%, 50%, 75%, and 100%. For each trait was quantified its rebate, density, air incorporation, resistance to axial compression, traction, deformation module, absorption by immersion, alkali-aggregate reaction and an economic evaluation. It is considered that the main objective of this research has been fully achieved, because it was proven the theoretical feasibility of replacing part or even all, of natural sand by artificial sand in conventionalItem Influência do agregado graúdo reciclado de resíduos da construção predial nas propriedades do concreto fresco e endurecido(Universidade Federal de Goiás, 2007-10-04) NUNES, Wesley Carlos; FIGUEIREDO, Enio José Pazini; lattes.cnpq.br/4075543806767323Recycling waste materials is an efficient way to hinder environmental, social and economic impacts of the civil construction industry. This dissertation aimed at verifying the behavior of different concretes made of coarse recycled aggregate (AGR), mineral fractions collected from the waste (RCD) of a high- rise apartment building (multiple floor building). The RCD has been selectively collected at the building construction site and processed by a jaw crusher. The study focused on the effects of gradual replacements of coarse natural aggregate (AGN) by AGR where the fundamental properties of the fresh and hardened concretes are concerned. The experiment involved the production of three dry aggregate/ceme nt ratios: (3,5 / 1), (5 / 1) and (6,5 / 1) for each concrete family (zero%, 25%, 50%, 75% and 100% replacement contents of AGN by AGR), and thus 15 different concrete mix proportions were manufactured. Workability, entrapped air, and density were the variables analyzed in the fresh concretes. Furthermore, water absorption, density, total pores volume, compressive strength, splitting-tensile strength, and initial-tangent modulus were the properties studied in hardened concretes. The strengths of concretes with AGR contents are lower than those of corresponding reference concretes (zero% of replacement content of AGN by AGR). However, reductions in the cement content in mixtures of the concretes produced with AGR showed compressive and splitting-tensile strengths values nearer to those of the reference concrete family. The experiment allows for the conclusion that concretes produced from AGR of RCD can be used for several purposes in civil construction, if the management of concrete mix proportions and the control of quality are performed under the liability of capable and qualified professionals.Item Influência da substituição parcial do cimento portland pela cinza do bagaço de cana-de-açúcar (CBC) residual no concreto(Universidade Federal de Goiás, 2010-12-21) SILVEIRA, Daniel Antônio; FIGUEIREDO, Enio José Pazini; lattes.cnpq.br/4075543806767323The Sugar Cane Bagasse Ash (SCBA) is a major waste of the sugar cane industry and one of the most bulky solid wastes produced by Brazilian Industries. This industry annually produces millions of tons of SCBA from cane bagasse burning in the cogeneration of energy. According to Brazilian estimatives of sugar cane production to the year 2010, it is been expected a production of 697 million tons of sugar cane, that can generate more than 181 million tons of bagasse with 50% moisture and from that 4,5 millions tons of SCBA, if considering that all sugar cane will be used to milling and the use of bagasse as a fuel to boilers. The aim of the study was to evaluate the influence of the partial replacement of CPVARI Portland Cement by the residual SCBA obtained from an industry on the State of Goiás on mechanical properties of ordinary and high strength concrete, as well as properties related to durability. Concrete was characterized even fresh. The replacement content used were 0%, 5%, 10% and 20% of residual SCBA, in mass. Before use, the SCBA was subjected to a sieving process (opening mesh 1.19 mm), drying and grinding for 4 hours in a ball mill. Two water/ binder relations (w/b), 0.37 and 0.60 were adopted, resulting 8 different concrete types. The durability parameters were determined in transport mass assays and carbonation resistance. The transport mass assays, as permeability assays, capillary absorption and by immersion indicated an excellent level of replacement around 10% in both concrete. With regard to carbonation depth was observed a small reduction in carbonation resistance as the increased of replacement partial of Portland cement by SCBA. For the analysis of mechanical strength using the CBC residual levels up to 10% did not affect the concrete properties.Item VIABILIDADE DO USO DE CINZAS DE BAGAÇO DE CANADE- AÇÚCAR (CBC) RESIDUAIS DO ESTADO DE GOIÁS COMO ADIÇÃO MINERAL AO CIMENTO PORTLAND(Universidade Federal de Goiás, 2009-11-13) SOUSA, Lara Rubia Lopes de; FIGUEIREDO, Enio José Pazini; lattes.cnpq.br/4075543806767323Aiming to reduce the generation of waste in industrial and agriculture processes, especially the pollutants, and reuses them best, whether in the production process or as raw material in the preparation of other materials, it has increasingly invested in searches for the processing of waste in industrial by-products of commercial interest. With increasing energy demand in the world, Brazil is an ecologically correct fuel producer, such as ethanol and bio diesel. In the State of Goiás there is a large potential for growth of industry cultivating sugar-cane, responding to sustainable energy issues. Furthermore, the recent national development policies point to the expansion of the sugaralcohol sector in the state. With the intensification of the industrial process of sugar-cane in Goiás, it is, increasingly, the occurrence of problems associated with disposal of waste generated by this sector. Much of that waste can be used to produce new building materials and meet the growing demand for alternative technologies, simpler, efficient and concerned about the sustainability of production processes. The research on the use of sugar-cane bagasse ash (CBC) as mineral addition to cement is still incipient. However, studies indicate the feasibility of using ash in conjunction with Portland cement. Additions are mineral materials with pozzolanic properties, cementations or simply act as filler and can be added to cement, before or during mixing, in amounts generally ranging between 5 and 70% by weight of cement. In the specific case of the sugar-cane bagasse ash (CBC), produced by the co-generation of electricity, due to the predominant presence of silica in its chemical composition, this residue appears as raw material for potential production of Portland cement compounds. The experimental level of this study was based on an assessment of the sugaralcohol sector in the state of Goiás to the implementation of chemical and physical testing of CBC, development of composite cement with replacement of CBCs at different levels (5%, 10% and 20%) and tests to characterize the cement composite, to produce cement with the addition of sugar-cane bagasse ash (CBC) and attend the needs of the cement industry. The results shows up that mortars produced with of cane bagasse ash, with the boiler firing temperature at 800 º C, so instant, crushed for 4 h, with replacement of Portland cement up to 20% reached resistance to compression close to the reference mortar .