Programa de Pós-Graduação em Engenharia Civil - PPGEC/ITEC

URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/2303

O Programa de Pós-Graduação em Engenharia Civil (PPGEC) do Instituto de Tecnologia (ITEC) da Universidade Federal do Pará (UFPA) foi aprovado pela CAPES em 1999 e teve sua primeira turma iniciada em 2001, sendo o primeiro Curso de Mestrado Engenharia Civil na Região Norte do Brasil, realizando atividades integradas de Ensino, Pesquisa e Extensão nas áreas de Engenharia Civil e Engenharia Sanitária e Ambiental.

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Agora exibindo 1 - 20 de 261

Acesso aberto (Open Access)
Gestão de conflitos pelo uso da água em bacias hidrográficas urbanas
(Universidade Federal do Pará, 2003-01-18) SILVA, Andressa Macêdo e; LIMA, José Júlio Ferreira; http://lattes.cnpq.br/5176390429456548; BARP, Ana Rosa Baganha; http://lattes.cnpq.br/0286183914646934
This dissertation studies the management of conflicts on the use of the water in urban watershed. It proposes the use of non-structural measures for the equationing of conflicts using as tool of support information methodologies, more precisely, the software of analysis of qualitative data, Nvivo. The research was accomplished within in Igarapé Tucunduba Basin. It counted with bibliographical review regarding the case study area and of conflicts, besides the use of Nvivo. As results there are tables, spread streets and comparative graphs, test is of the hypothesis of the study. It concluded that the non-structural measures are suitable thoroughly as it concerns conflicts originated by the pollution of water, specially, with respect to municipal refuse. It recommends a Project of Environmental Education for the area, that should be enlarged later, continuous and concomitant to all other projects.
Acesso aberto (Open Access)
Mapeamento das fundações mais usadas na cidade de Belém-PA: aspectos gerais e proposta preliminar de mapeamento de soluções utilizadas em casos recentes
(Universidade Federal do Pará, 2003-03-21) SALAME, Antonio Massoud; ALENCAR JÚNIOR, Júlio Augusto de; http://lattes.cnpq.br/3663658632717465
Accomplishes the survey of the most commonly types of foundations used in the construction work, in the last decades in the city of Belém-PA; defining its characteristics, peculiarities, technical aspects of the its measurement, load capacity and, executive process. Identifies the type of the soil in which are laid with respective profile and geotechnical characteristics and divides the city into areas, mapping according to its geological profile; type of foundation; layer depth; executive process and, relative cost. The work is divided in four stages: the first one corresponds the literature review, regarding the study of the foundations, including the foundation historical development and soil mechanics in the world, in Brazil and in Belém; geotechnical research with characteristics of the soil in the area of Belém and, study of the Geographical Information Systems GIS. The second stage involving technical survey in construction and design companies, for development of database concerning the foundations used in the city. The third, to relates the ordination and technical analyses of the collected data and, the fourth consists on the writing of the final text and the elaboration of the city maps, based on the Geographical Information Systems GIS, in scale 1:10.000, concerning the type of foundation; the geotechnical profile of the soil; the soils kind and the executive process; the probable foundation depth and, the relative cost of the foundation in relation to the total of the work.
Acesso aberto (Open Access)
Gestão estratégica e otimização de custos de produção: a experiência da COHAB/PA na provisão de infra-estrutura urbana em assentamentos habitacionais da Região Metropolitana de Belém
(Universidade Federal do Pará, 2003-06-16) VALENTE, Mary Lucy Mendes Guimarães; LIMA, José Júlio Ferreira; http://lattes.cnpq.br/5176390429456548
This dissertation presents a study of organisational restructure and productive processes conducted within a public housing company, namely Companhia de Habitação do Estado do Pará (Pará Estate Housing Company) COHAB/PA, aiming at assessing the efficiency of processes and efficacy of production costs applied in the provision of urban infrastructure in housing settlements in Belém Metropolitan Region. It is developed through a contextual approach of public policies, housing production and referred to the emergency of new organisational methodologies, which, in turn, establish a theoretical framework for considerations about strategic administration and organisational schemes and for the analysis of production costs. Research methodology used permitted the establishment of correlation between organisational and production performances with the use of indicators drawn up from empirical assessment of the object both in qualitative and evaluative terms. The results obtained with the production assessment show advances in that sector of the company, however, also reveal there has been a certain disarticulation between organisational and production performances, which is translated, substantially, into cost elements and by the projects of housing settlements provided with infrastructure services.
Acesso aberto (Open Access)
Avaliação da satisfação de usuários de imóveis residenciais: uma comparação entre incorporação pública e privada em Belém
(Universidade Federal do Pará, 2003-06-20) CARDOSO, Gustavo Duarte; LIMA, José Júlio Ferreira; http://lattes.cnpq.br/5176390429456548
This dissertation evaluates and analyses the level of satisfaction of users in residential developments relating to the production and the use of buildings taking into consideration the correlation between the product and socio-economic profiles of residents, as well as patterns of residential mobility process and attributes which determine decision taking by users when choosing new housing. It presents the results of field work based on research designed with references to the âMethod of Evaluation of the Level of Satisfaction of Residential Estates Clientsâ proposed by Jobim (1997) and to Post Occupancy Evaluation techniques, applied in two housing development companies, one public and another private, both involved in qualification programs. The survey consisted of interviews with directors of both companies, the application of questionnaires and interviews with owners of apartments of a development built by the private company and two others built by public company. These methods were used in order to guide the assessment of satisfaction of a) attendance services provided by the companies; b) the quality of the building and, c) the quality of residential units. As results it was found that there was a reduction in the number of unsatisfactory items in relation of the most recent development built by the public company in relation to oldest, however, with more advantage when compared to the private company case because of factors related to users expectations found in the field work.
Acesso aberto (Open Access)
Sistematização do fluxo de informações no processo de projeto de edificações em empresas construtoras e incorporadoras
(Universidade Federal do Pará, 2003-10-21) CORDEIRO, Rony Helder Nogueira; CRUZ, André Luiz Guerreiro da; http://lattes.cnpq.br/5891750095857292
This work deals with information flow in relation to process development in the field of vertical multihomes or commercial building projects. This kind of flow comes from usual exchange of ideas in regard the procedures involving building companies, architecture professionals, structure designers, electric and hydrosanitary professionals and procedures applied by them to reach the degree of quality of the projects. Traditional methods and application of concurrent engineering concepts are investigated in order to suggest additional planning of the different phases of the process; products and production projects, leading to make up of multimatter teams of professionals, besides better orientation to reach complete owner satisfaction. A method of analysis is introduced to identify build companies maturity as to concurrent engineering implantation and to information flow explanation to get a global sight of the project process. Three case studies are accomplished, inquiring three building companies and incorporated ones and their planners such as: architect, structural, electric and sanitary engineers, who examined the research hypothesis. As result it is recommended the developing of project process models, based on concurrent engineering principles and methods providing global view of the process to support intervenients in the systematic and rational exchange of information aiming introduction of tools to contribute to a molding project process in accordance to quality principles.
Acesso aberto (Open Access)
Projeto de macrodrenagem da Bacia do Una e índice de qualidade de vida de seus moradores
(Universidade Federal do Pará, 2004) BRASIL, Syane Cristina; TOBIAS, Maisa Sales Gama; http://lattes.cnpq.br/9635266655242384; CARDOSO, Ana Cláudia Duarte; http://lattes.cnpq.br/3138101153535395
This thesis addresses the investigation about quality of life conditions of population resident in the area affected by Una Basin´s Macrodrainage Project (PMU). This project embraces nine neighborhoods of Belém -PA. It was developed to clean up and to recover flooded areas in the city, generating better life conditions for its inhabitants. This research aims to evaluate the effects of the cited project on inhabitant's life conditions. The methodology adopted incorporates the inhabitant’s vision about the intervention and, also, promotes a comparative analysis among the several areas reached by the project. The research identifies aspects of inhabitants‘ lives such as habitation, infrastructure, public services and accessibility conditions. The project is not completely consolidated yet; however, we already shimmered positive and negative points of the intervention. PMU didn't get to satisfy the expectations of the involved population over its execution, in spite of the abundance of financial resources, professionals' support, management and planning actions from several government spheres, besides the support of the involved entities. Several reasons handicapped the project’s aims of improving the quality of urban life of 60% of Belém`s population. Quality of life assessment was the approach adopted, through the construction of an index capable to identify and mensure the levels of lack or satisfaction of case study areas’ social needs, though the questioning on satisfaction of inhabitant’s expectations. This index was obtained trough indicators collected through semi-structured interviews in three sub areas of the project originated as informal settlements and in the Paraíso dos Pássaros, area built to shelter the inhabitants realocated for the macrodrenagem project, which received 2000 families. This investigation is important to know the real effects of official actions and public interventions, as it is the case of PMU, on inhabitants‘ living conditions of affected areas. It is expected that the proposed index will subsidize technical and political decisions about planning and urban administration for the study area and to define spacial and sectorial priorities for urban intervention, facilitating a more efficient and just public resources distribution, and favoring the sustainable improvement of quality of urban life. This work hopes to help in setting standards for decision-making, regarding to action priorities and urban investments and, specially, to the formulation of public policies to combat social exclusion.
Acesso aberto (Open Access)
Estudo de aproveitamento do resíduo do beneficiamento de caulim como matéria prima na produção de pozolanas para cimentos compostos e pozolânicos
(Universidade Federal do Pará, 2004-01-16) LIMA, Jefferson Maia; CARNEIRO, Arnaldo Manoel Pereira; http://lattes.cnpq.br/9191655335324358
The use of residue in civil construction can to become a activity of extreme important and more frequent, mainly due to amount available with potential of recycling, possible reduction of environments impacts. The kaolin industries produces two type of residue. The residue contain clay mineral kaulinite show potentially of is to employ by pozzolanas at the construction civil industry. This research evaluates the technical viability to production of pozzolanas from mixtures in various percentagens of kaulinitic residue with limestone, wanting increase the reactivity. The contents of replacement of cement for pozzolanas is of 10%, 20%, 30%, 40%, 50% e 60% was studied. The cement employed was CP I S 32 and the pozolanas was made in the laboratory. The following tests in the experiment cements were carried out: specific gravity, specific surface area, water of normal consistency, setting time and compressive strength. Also, were carried out mineralogical tests in the pozolanas. The incorporation of pozzolanas allowed to mortar obtain compressive strengths more than it reference even though in high contents. Due to the pozzolanas show a considerable hydraulic characteristic this it occurred. It waits of residue burned becomes a higher pozzolana to employ at the civil construction, mainly along with cement, mortars and concretes in the substitution of burning clays from natural deposits despite necessity of adding tests for confirmation and complementation of effects was observed.
Acesso aberto (Open Access)
Identificação dos fatores para o processo de formação e gestão de alianças estratégicas do tipo consórcio em pequenas e médias empresas construtoras: um estudo de caso
(Universidade Federal do Pará, 2004-02-26) SÁ, José Alberto Silva de; CRUZ, André Luiz Guerreiro da; http://lattes.cnpq.br/5891750095857292
A study done in societys consortium composed by small and medium building companies to execute sanitation works in the Marajó Island PA. The objective of the work is identifying factors for the formation and administration process of strategic alliances, consortium type. The research had descriptive characteristic, with synchronous perspective and organizational analysis level. It looked for describe and interpret analytics and politics considerations related to the phenomenon in question. Half-structured interviews were applied in the data collect and was used the content analysis method in the treatment of the information. The research allowed identifying a group of factors, amongst them: the complementarily perspective, the desire of the business qualification, the capacity to generate market opening, the organizational learning, the study of the strategically combination, the joint deliberation, the equality of the property and the conciliation of the business vision.
Acesso aberto (Open Access)
A implantação de obras civis e de saneamento na Bacia do Una, em Belém do Pará, e as condicionantes relacionadas às características geológicas e geotécnicas
(Universidade Federal do Pará, 2004-04-26) SILVA, Kleber Roberto Matos da; ALENCAR JÚNIOR, Júlio Augusto de; http://lattes.cnpq.br/3663658632717465
This Thesis presents the civil engineering works for implementation of drainage and sanitation facilities in the area of influence of the Una canal, in the city of Belém, in the State of Pará, Brazil, involving the installation of drainage, water and sewer nets as well as road construction. This project, known as Project Una, involves an area of 3.644 ha, corresponding to approximately 21% of the continental area of city, with great part of its surface below flood level, that is, up to 3,60 m above sea level. The stratigrafy of the project area is composed basically of a thick superficial layer of very soft organic clay, that in some cases may reach over 60 m deep, overling intercalation of medium to compact sand layers and medium to hard silty clay layers. Besides the construction difficulties in soils of this nature, this work presents the many problems to resolved, as the resettlement of families of risk areas, that is, families that are living on the bed of channels, hindering the draining of the served waters and pluvial waters; the compensations of shaky residences for the works; the lack of physical space for the setting up of the works; the instability of the slopes of the marginal road of channels; the difficulties of management in the of face the extensive encircle of the area; the relationships with the community, tumultuated in some moments and, mainly, the priority of some areas, in detriment of other, for the execution of the works, in the face of available resources. Based in technical reports, projects and the author's personal experiences the thesis makes a description of the project in its several aspects, as well, makes a critical review of it, under the civil engineering’s point of view, involving planning and executions aspects of the works, with the purpose of building and setting up of the knowledge, that promote the improvement in future development in the similar projects.
Acesso aberto (Open Access)
Estratégia de competição empresarial na construção civil paraense da Copala Industrias Reunidas S/A
(Universidade Federal do Pará, 2004-09-01) RUFFEIL JUNIOR, Simão Massud; ICHIHARA, Jorge de Araújo; http://lattes.cnpq.br/5726366418302065
This dissertation is based on the analysis of competitive strategy adopted in the market of iron bar for civil construction in Belém, capital of Pará, by COPALA INDUSTRIAS REUNIDAS S/A. So, there is interest in evaluate the possibilities of the company in the sense o f staying actuating with success in the sector, in which weighs the contestant carried out by metallurgies of great deportment, of which interests are from national and international encompassing. Search were realized considering the steel market of de civil construction of an ample way, being consulted constructors, businessmen and consumers of that material. Like wise, the proper COPALA was object of evaluation as well as acquirer of raw material to the steel manufacture, as how producer and seller of the product .
Acesso aberto (Open Access)
Estudo da conceituação e implementação de vias sanitárias em Belém: o caso da bacia de drenagem Estrada Nova
(Universidade Federal do Pará, 2004-09-20) LIMA, Henrique Nazareno Santos; LIMA, José Júlio Ferreira; http://lattes.cnpq.br/5176390429456548
This dissertation aims at giving a more specific account of the term sanitary road utilised in sanitary enginnering. It applies principles used in the projects of canal marginal roads, narrow short streets and trunk roads. The study is based on the case of Estrada Nova basin located in the city of Belem. After a characterisation of its fuctioning, its relationships with the urbanistc control is explored in order to be more compatible with land use control. The result of the study presents elements for the a reconsideration fo the definition wihch incorporates the urbanistic situation and needs for drainage projects to be more integrated with the urbanistic functioning of the city.
Acesso aberto (Open Access)
Importância da frequência de descarte de lodo na eficiência dos decantadores de estações de tratamento de água em ciclo completo
(Universidade Federal do Pará, 2004-10-20) CUNHA, Márcia Valéria Porto de Oliveira; PEREIRA, José Almir Rodrigues; http://lattes.cnpq.br/9918600634569244
In this work, different periods of discharge of the sludge stored in the decanters of the ETA Bolonha had been evaluated, with the purpose to recommend the operational routine that presents the best ones results in the efficiency of the decanters. The three experimental phases had been divided in three stages: being in phase 1 evaluated the efficiency of the current operation routine of the decanters what is the total discharge of sludge in 12 in 12 days. In phase 2, the operational routine was modified to a daily discharge during the time of 5 minutes and so it coud take care of the recommendations of the executive project; by the other hand, in phase 3, the operational routine was modified again, discharge of sludge of 5 in 5 days during the time of 5 minutes, in order to getting better results of efficiency. In these three phases it was realized the control of total suspended solids, dimming and color in the effluent tributary and, as well as quantified and characterized the sludge generated in the decanters. With the research it was possible to observe that according to the point of view of efficiency of the decanters, the implemented operational routine in phase 3 (discherge of sludge to each 5 days) it was showed more adequate. By the way, it recommends that tests with other operational routines should be done in order to remove the sludge deposited in the decanters to diminish the losses of water of this operation. Moreover, it is important to study other ways to remove the deposited sludge in the intermediate tray of the decanter to prevent the accumulation of sludge on tray.
Acesso aberto (Open Access)
A manutenção do equilíbrio econômico de contratos de obras públicas empreitadas: parâmetros para o estudo de riscos vinculados a atrasos no encaixe do preço
(Universidade Federal do Pará, 2004-12-01) MATTOS, Renato Marinho Meira; ALENCAR, Cláudio Tavares de; http://lattes.cnpq.br/1047965312058430; CRUZ, André Luiz Guerreiro da; http://lattes.cnpq.br/5891750095857292
In the Civil Engineering field, one of the most important segments is the global piecework, the one that is made by an agreement and by the right and total price. Public works, that are meant to attend a public utility, and whose contracts are ruled by the 8.666/93 Law, are often bided this way. Article 58 of this Law determines that the economic-financial balance of these contracts must be kept. The theoric fundamentation concerns of public works concepts, the most important aspects of 8.666/93 Law, economic-financial analysis and risks analysis. This paper presents, also, a systematic and numeric simulation to piecework undertaking im Civil Engineering field. The goal of this paper is to create parameters for the establishment of protection margins for due-date extension, and respective price receiving, as determined by 8.666/93 Law, thus keeping the original balance. Based on 63 analyzed construction works, the economic-financial balance is verified, comparing the expected restricted return rate at the bidding moment, with the one that was actually obtained in the operation. From the deviation detected in the return rates between those two different moments, parameters for covering the referred risks are created by a simulation process and sensibility analysis. First, at the bidding moment, the restrict return mean rate is 9,45% a month. At the second moment, this rate falls to 5,16% a month. It represents, in mean, 45,39% of variation. The atractive mean rate based on the analysed public construction works is between 6% to 13% a month. The calculated parameters for due-date extension and respective price receiving is between 1,5% to 11,5% of price. Therefore, in the analysed public works, dont exist the economic-finacial maintaining balance.
Acesso aberto (Open Access)
Análise termoelástica experimental e computacional por elementos finitos da parede externa em concreto armado de um forno de cozimento de anodo
(Universidade Federal do Pará, 2004-12-16) TEIXEIRA, Marcelo Rassy; SOUZA, Remo Magalhães de; http://lattes.cnpq.br/1995895693959225
This thesis presents a study about the behavior of a reinforced concrete structure subjected to high thermal variations. The structure under investigation is the external wall of an anode furnace used in Aluminum production, and is subjected to thermal variations in the range of 125C (2282 F) due to the furnace operation. The main motivations for the study were the presence of large deformations and occurrence of cracks in the structure, which could cause the furnace to become inoperable. The objective of the research was to investigate the causes of these structural pathologies, as well as to establish retrofit proposals for the structure. For this purpose, experimental and numerical studies were carried out. At first, the structure was monitored using displacement transducers and temperature sensors (thermocouples) connected to a data acquisition system, which could automatically obtain and store samples along the test period. Next, computer models were developed, using a multiphysics Finite Element Code called Algor, for the evaluation of temperature distribution and corresponding thermal stresses and strains in the structure. In these studies, stationary and transient heat conduction analyses were performed, followed by thermal stress analyses. As a conclusion of this research, it can be stated that the proposed methodology, based on advanced tools of structural engineering, was very suitable for the study of the presented phenomenon, since it rendered a precise and economic solution for the problem.
Acesso aberto (Open Access)
Proposta de gerenciamento operacional para a Estação de Tratamento de Esgoto: estudo da ETE Sideral, Belém-PA
(Universidade Federal do Pará, 2005) BARBOSA, Ana Julia Soares; PEREIRA, José Almir Rodrigues; http://lattes.cnpq.br/9918600634569244
In the present work, operational management of the Sideral Sewer Treatment Station is proposed - Belém City, Pará State. For that, was used a management method named management of the routine that aims to manage a main process by means of the flowcharts definition where certain activities and control items organize the process. In the work are analyzed: the physical conditions of the units and its influences in the proposed treatment; the current management way of SSTS, to finally elaborate the operational management proposal. The proposal has defined the main process, the sewer treatment, its subprocesses, the preliminary and secondary treatments, for which were defined operational activities as cleaning up the units, laboratorial and operational monitorship and control items as spreadsheet of data. It was also proposed the elaboration of a system to control data and informations for SSTS, as well as the management decisions and operations routine for SSTS.
Acesso aberto (Open Access)
Plano diretor setorial do sistema de esgotamento sanitário: alternativas de concepção para a área de maior adensamento populacional do município de Belém - PA
(Universidade Federal do Pará, 2005) SILVA, Valdinei Mendes da; PEREIRA, José Almir Rodrigues; http://lattes.cnpq.br/9918600634569244
In this work are proposed conceptions to support the expansion planning of the collecting system, treatment and final disposal of sewer in Belém City, more specifically in the area which has the larger population density (1,143,946 inhabitants) and low Sanitary Sewer System (SSS) assistance rate. For that, actions in order to expand this infra-structure are necessary and it must occur in sustainable, efficient, planned and integrated ways. In the work are analyzed studies and projects already carried out on the planning area. Firstly, it was made a diagnostic of the SSS existent. Then it was elaborated the population projection on the period from 2005 to 2025 and calculated the sewer demand for the next 20 years. Finally, with these data, it was formulated the conception alternatives. The 6 (six) conception alternatives are based on SSS progressive decentralization showing variations concerning the number of Sewer Treatment Stations (STP), collection and transposition features of sanitary sewer among the sewerage system basins and the location of the STSs. The alternative 3 (three) was the best one because it presents sewer treatment closer to its source. The work intends to contribute towards taking decisions in order to expand the SSS in Belém City.
Acesso aberto (Open Access)
Modelo cognitivo informacional de suporte a decisão aplicado à gestão de bacias urbanas
(Universidade Federal do Pará, 2005-01-19) BAGANHA JÚNIOR, Luiz Gonzaga; BARP, Ana Rosa Baganha; http://lattes.cnpq.br/0286183914646934
The research was carried through from the choice of the corresponding area to the basin of the Tucunduba narrow river, in the urban zone of Belém, capital of the State of Pará, and is come back toward the development of a computational causal structure cognitive capable to identify and to characterize the potential indicating processes conflicts generated for the multiple uses of the water in this urban basin, and with this to make possible decisions in the scope of the structural and not structural measures. The use of a qualitative model, using informacionais methodologies, as software Decision Explorer, in the area of water resources, aims at to not only understand the aspects hydrologics, but also the social, indispensable aspects in the taking of decision ahead of a scene of conflitualidade how much to the use of these resources. This software is a tool for the development of the cognitive mapping, through which representative causes and effect by means of visualization codified of the same ones will be grouped the concepts joining. The identification and qualification of the decurrent conflicts of the multiple uses of the water had been carried through from interviews with specialists in the area of management and sanitation, being later generated the cognitives maps thus making possible the description of the chosen system and the identification of the possible mediating solutions for the conflicts identified there. The result gotten from the interviews was added in an only map with intention to prove the hypothesis formulated in the research, by means of the analysis tools, or either, to assist in the identification of the conflicts for the multiple use of the water, from existing the structural and not structural measures (or proposals), in order to provide to the manager the borrower of decision of more efficient form in the solution of these conflicts. In this in case that, we could say that this group of constructs illustrates the main ones measured to be observed for the decision borrower, in order to solve the conflicts for the multiple use in the basin of the Tucunduba, evidenced for the facilitator through the interviews and individual cognitives maps. The conclusions and recommendations are contained in the final chapter are gotten not only through the extracted results of used software, but mainly by means of the intervention and interpretation of the data for the researcher, that it gets to break of these analyses the agreement of the functioning of the system, the identification of the potential conflicts, its causes and effect, as well as the mitigates measures to be suggested the decision borrower. They are enclosed in this chapter suggestions aiming at the improvement of the model bred.
Acesso aberto (Open Access)
Contribuição para o desenvolvimento de compósito cimento-madeira com materiais da região amazônica
(Universidade Federal do Pará, 2005-06) FONSECA, Fábio de Oliveira; MACEDO, Alcebíades Negrão; http://lattes.cnpq.br/8313864897400179
This work intends to propose an application for tropical wood waste from wood industry as saw dust; from the region of Belem, in the fabrication of wood-cement composite. Due to the natural chemical incompatibility between wood and cement, this procedure results in a set retarding effect, with wood specie depending intensity. This by-effect can be beaten by using a procedure like additives, wood mineralization, accelerated carbonation and others. Analysis were made with axial compression strength at 28 days age data, for mortars made with 2, 3.5 and 5% wood content in mass; using cements type CP I and CP II; with and without Calcium Clorets-based set accelerator additive. Then, obtained data were statistically analyzed for evaluation on wood content and additive use over mechanical resistance. Most of existing researches uses reforesting species, being the tropical ones almost never studied. So, this work represents a pioneer effort in developing a cement-bonded wood composite with our regionally available materials and residues.
Acesso aberto (Open Access)
Aplicação da metodologia neoclássica da demanda tudo ou nada como subsídio à cobrança pelo uso dos recursos hídricos
(Universidade Federal do Pará, 2005-06-30) CAMPOS, Catharina Ramos dos Prazeres; BARP, Ana Rosa Baganha; http://lattes.cnpq.br/0286183914646934
The world-wide problem of water scarcity has been induced many countries to adopt, between other measures, economic instruments to reverse that situation. An example of this kind of instrument is the “water charging”. It is suggested the implementation of this instrument in the State of Pará, where there is still abundance of water resources. Based on bibliography research of international and national experiences on the adoption of this instrument of management and based on economic methods of water charging which were used in Brazil, it is applied the method of “tudo ou nada” demand, on the watershed of the lakes Água Preta e Bolonha, which are the objects of the study, placed on Belém city. Some countries as France and Germany, are well-succeed examples of this implementation. In Brazil, the states of São Paulo and Ceará, due to its great scarcity, were the first states to include the water charging as a priority in their water resources management systems. However, this practice in solving problems only when they are critical, has been very onerous to their economies. The application of the method at the lakes Água Preta e Bolonha was based on a similar application done at the watershed of the Pirapama river, in the state of Pernambuco. As the conclusions of this work, the aplication of the method of “tudo ou nada” demand was possible in regions of abundance of water.
Acesso aberto (Open Access)
Influência de três tipos de tratamentos físicos na resistência à compressão de compósitos cimento-madeira à base de resíduos de serraria
(Universidade Federal do Pará, 2005-09-20) LIMA, Alexandre Martins de; AGUIAR, Osmar José Romeiro de; http://lattes.cnpq.br/5816019774493244; MACEDO, Alcebíades Negrão; http://lattes.cnpq.br/8313864897400179
In the present research work, the effect of the type of physical treatment in the resistance to compression of composites cement-wood was analyzed. Residues of variegated compositions (hardwood) collected at sawmills of the Metropolitan area of Belém were used, and the effects of the following treatments were studied: drying in stove, thermal bath and the mineralization with aluminum sulfate. The first step of the research was the survey of the theoretical references as support for the experimental program. Next, the constituent materials of the composite were characterized according to methods prescribed by the Brazilian Norms and after being homogenized, lab tests were carried out in the fresh state. The tests in the hardened state were driven in such a way that the mechanical characteristic observed for the evaluation of the effect of the referred treatments was the tensile strength. The results indicated that the used residues inhibit the hydration of the cement matrix, as well as they influence the resistance negatively the tensile strength. The residues treated with drying in stove provided the smallest resistances to the compression observed for the composites; the treatment of thermal bath and the treatment of mineralization presented better results. However, even presenting a slight difference among the medium values for the rupture tensions, they presented statistical equivalence, and they corroborated the statement that the treatment typology used in the residues is preponderant factor to mitigate the harmful effects of the extractives of the wood in the resistance to compression of the mortars.