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 - 4 de 4

Acesso aberto (Open Access)
Emprego de Resíduo de Silício Metálico como Material Pozolânico na Produção de Cimento Portland Composto
(Universidade Federal do Pará, 2022-12-19) CUNHA, Rodrigo Rodrigues da; MACEDO, Alcebíades Negrão; http://lattes.cnpq.br/8313864897400179
Civil construction, despite being an extremely important sector for the country's economic development, consumes a very significant amount of natural raw materials, in addition to being responsible for most of the consumption of cement produced in the world. The production of this material, in turn, causes many environmental impacts, resulting mainly from the sintering stage of clinker (main constituent of cement), which causes the emission of thousands of tons of CO2 into the atmosphere. In this sense, several studies have been carried out in order to point out an alternative material that can be used as a mineral addition to cement instead of clinker. Much of this research has sought to study the use of additions manufactured from the use of industrial waste. Given this context, the present work aims to analyze the behavior of a modified Portland cement of the CPIIZ-32 type, produced with partial replacement of clinker, by a residue from the pre-separator of the ferrosilicon - metallic silicon manufacturing process. - from an industry located in Breu Branco/PA. Therefore, at first, the physical and chemical characterization of the residue in natura and processed form was carried out, through the milling process, from the specific mass, FR-X, DR-X and activity index tests. pozzolanic with lime and cement. Then, 5 (five) blends of composite cement were formulated with different contents of ground silicon metal residue to analyze the mechanical behavior at 28 and 90 days of curing. Finally, a comparison was made of the physical-mechanical performance of the mortars produced with the use of modified cement and commercial cement of the CPIIZ-32 type. The results showed that the metallic silicon residue, after going through a pre-benefiting process (grinding for a period of 60 minutes) obtains properties consistent with the requirements stipulated by NBR 12653 (ABNT, 2014) to be considered as a pozzolanic addition. The use of this by-product for this purpose can generate enormous environmental benefits, reducing the impacts resulting from the clinker production stages, as well as being a viable alternative for the reverse logistics of this material, since the generating companies still do not have any form of reuse for this residue.
Acesso aberto (Open Access)
Gestão dos resíduos de construção civil procedentes de pequenas construções no Município de Belém- Pa
(Universidade Federal do Pará, 2019-02-26) LEITE, João Alex Garcia; PICANÇO, Marcelo de Souza; http://lattes.cnpq.br/4535052395600357; https://orcid.org/0000-0001-7313-1229
The construction industry is one of the most important sectors to the economic development of Brazil. However, it also causes some of the greatest environmental impacts mainly due to the improper disposal of construction waste (CW) in natural areas and large urban centers. The issue of CW in Belém includes the problematic due to the absence of the Municipal Construction Waste Management Plan (PMGRCC). Of particular note is the daily construction waste generated and improperly disposed of by small companies and individuals, which is very common in Belém. The main objective of this dissertation is to study the current CW management system for small companies and individuals, with the purpose of improving the treatment processes for CW improperly disposed of by small-scale construction sites in the city of Belém. The specific aims include: identification of those involved in the generation, transportation, and final disposal of CW. The research is based on an exploratory, explanatory, qualitative approach and will be restricted to the Municipality of Belém. It will involve field visits to take photographic records, interviews with those involved in the process, and analysis of data from the Municipal Sanitation Department (SESAN) and the Municipal Solid Waste Department (DRES). It is hoped that the results of this research will help facilitate the introduction of an efficient management process for the control, handling, and final disposal of CW in Belém.
Acesso aberto (Open Access)
Modelo para obtenção de incentivos fiscais de ICMS aplicados à cadeia produtiva da construção: uma análise da indústria de cerâmica vermelha
(Universidade Federal do Pará, 2021-01-29) FARIAS JUNIOR, Claudionor Andrade; DUARTE, André Augusto Azevedo Montenegro; ttp://lattes.cnpq.br/1135221873341973; https://orcid.org/0000-0003-4586-1587; NEVES, Renato Martins das; http://lattes.cnpq.br/6538317425557058
This thesis aims to analyze and propose guidelines to the criteria inherent to the ICMS legislation applied to Industries in General, establishing a model directed to the Construction Production Chain with emphasis on the Pará Red Ceramics Industry. To this end, it adopted theoretical concepts related to the characterization of its research universe as well as the main aspects pertinent to fiscal taxation in the referred chain, distancing itself from the legal and accounting approaches. As a central reference of the study, the model recommended by the state law of Pará, which provides for special tax treatment applicable to “industries in general”, is notable. To carry out the investigation, the quantitative research method was adopted, with the application of an electronic questionnaire to the group of industries belonging to the main ceramic pole in the northern region of Brazil. From the realization of the field research, the quantitative data collected were analyzed through the use of statistical techniques of descriptive and inferential analysis (multiple linear regression, cluster analysis, and analysis of variance). The results obtained give rise to divergent positions related to the theoretical and empirical validation of the original model. As for the empirical compartment, it is suggested: (1) the revision of the way of measuring the data referring to the variables “Innovation” and “Sustainability, with emphasis on gaining variability in the related data; and (2) the review of the scores (weights) attributed to these two variables, with emphasis on their corresponding levels of benefits achieved. As a relevant result, it is also worth highlighting the mapping of the investigated sector, highlighting: (1) the assessment of the framework of the companies participating in the research, concerning the reach of the different levels of benefit; and (2) the grouping of units (firms), considering the measure of similarity of the responses obtained. Conclusively, as a theoretical and managerial contribution, we highlight the filling of an important gap in the field of study related to the tax benefits applied to the construction production chain, such as the emphasis on the importance of a scientific foundation for the formulation of legislation associated with global public policies. Particularly, the contribution directed to the legislators of the different states of the federation, supporting the reflection and discussion about the impact of the variables "Innovation" and "Sustainability" in increasing the condition of competitiveness for companies.
Acesso aberto (Open Access)
Punção em lajes lisas unidirecionais de concreto armado com diferentes taxas de armadura secundária e pilares retangulares.
(Universidade Federal do Pará, 2022-09-29) BRANCO, Vitor Hugo Lopes; OLIVEIRA, Dênio Ramam Carvalho de; http://lattes.cnpq.br/1324105476558186
Symmetric punching tests and experimental analyses were conducted to evaluate the behavior of nine one-way reinforced concrete flat slabs. The slabs measured (1800 x 1800 x 120) mm, and loads were applied through three types of columns: A (85 × 85) mm, B (85 × 255) mm and C (85 × 425) mm. All slabs were made with constant longitudinal reinforcement ratio at around 1% (ρx) and different secondary flexural reinforcement ratios (ρy), namely type 1 (0.5%), type 2 (1%) and type 3 (2%), approximately. Concrete compressive strength of 28 MPa and elasticity modulus of 27 GPa. Reinforcement yield stress of 573 MPa and elasticity modulus of 244 GPa. Column rectangularity index (cmax/cmín) and secondary reinforcement ratio were the main research variables, and the present study evaluated their influence on the ultimate punching strength of the sampled one way reinforced concrete flat slabs. The experimental results were compared with four current international standards: ACI 318 (2019), EC2 (2004), MC 2010 (2011) and NBR 6118 (2014). They were also compared with the findings from a nonlinear numerical analysis made with the software ABAQUS CAE 6.14, based on the Finite Element Method (FEM) and on the Concrete Damage Plasticity (CDP) model. The results indicated that the standards need to be updated, and that there is a proportional increase of up to 50% approximately in slab punching strength when the secondary reinforcement ratio is increased by up to 2%.

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