Navegando por Assunto "Permeabilidade"

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Acesso aberto (Open Access)
Análise urbanístico-ambiental: condomínios fechados horizontais “Ecológicos” da Região Metropolitana de Belém
(Universidade Federal do Pará, 2021-11-10) SILVA, Marta Gonçalves Tavares da; PONTE, Juliano Pamplona Ximenes; http://lattes.cnpq.br/9287377245887247; https://orcid.org/0000-0002-7668-8409
This dissertation starts from the concern to investigate whether the housing typological structure, called Horizontal Closed Condominiums present in the Hydrographic Basins of the Metropolitan Region of Belém, present themselves as a solution for an ecological urban settlement. It is a housing typological structure that,in order to provide regulation as a settlement, promotes legislative cuts and finds connivance and prerogatives on the part of the public power that approves it. The Ecological Horizontal Closed Condominiums use the philosophical ideals of naturalism, creating a real estate product disseminated as a preservationist urban settlement, active in the production of urban space. Promotionally, they are place names with a commercial purpose of an ecological product boasting a tamed, reserved and exclusive nature. The objective is, therefore, to analyze theperformance and the form of occupation of the Ecological Horizontal Closed Condominiums in the scale of the Hydrographic Basins of the Metropolitan Region of Belém, specifically in BH Ariri and BH Benfica, if in fact they present urban performance - environmental, being able to be classified as ecological structures, since they are offered as an urban typology that is intended to have less environmental impact. Considering the typology of the Ecological Horizontal Closed Condominiums, this dissertation has the contribution in the method of the comprehensive approach in the field of Landscape Architecture, proposing to use the rationalization of the environmental dynamics and the urban occupation, culminating with the study of the functionality of the Hydrographic Basin - fundamental for ecological analysis - guided by urban and environmental parameters observed through aspects of vegetation cover, permeability - greater relevance to environmental performance - capillarity and morphological studies regarding the design of the urban mesh / road system, complemented with the base of social data, population density, income, and the presence of subnormal agglomerations in the Hydrographic Basins. The spatial arrangement of this housing is nothing more than a marketing real estate product with a preservationist philosophical content of very low permeability, they are structures that, in addition to ignoring the environmental aspect, are configured as propellers to the increase of impermeable surfaces, determining unsatisfactory socio environmental consequences, enhancing the environmental risk to the population present in the Hydrographic Basins. In view ofthe empty specificities that constitute this housing product -, freely established in the urban territory, directed only by housing zoning -, they are authorized to be called urban aberrations implanted in the territory, refuting aspects of ecological settlement and, therefore, establishing themselves with an environmental hoax.
Acesso aberto (Open Access)
Avaliação da influência de sistemas de proteção na permeabilidade de água em placas cimentícias com incorporação de perolas de poliestireno expandido
(Universidade Federal do Pará, 2025-04-24) GOMES, Saulo de Almada; CORDEIRO, Luciana de Nazaré Pinheiro; http://lattes.cnpq.br/9126233381230999; https://orcid.org/0000-0001-7931-4042
Water is one of the main elements responsible for the emergence and propagation of pathological events in coatings. Its permeated presence compromises the protective capacity, as well as directly influences durability, and can accelerate the deterioration of mortars, impairing their useful life. It is known that the use of surface protection instruments (painting system) and the use of waterproofing additives in the production of mortar coatings directly influence the protection against water permeability. Within this aspect, this study aimed to evaluate the degree of influence of protection systems for cement boards with the incorporation of Expanded Polystyrene (EPS). EPS was used in the cement board as a partial replacement for sand, in a volume of 20%. Two types of painting systems were evaluated, one for indoor environments and the other for outdoor environments, in addition to a type of waterproofing water-repellent additive, which was applied to the mortar mixture. This evaluation was carried out using two methods that analyze the permeability of mortar coatings: the Karsten tube test (pipe method) and the permeability test of ABNT NBR 15498/2021, which deals with the requirements for using cement boards. The mechanical properties of the mortars and boards were also characterized. The results of this work demonstrated that the protection systems evaluated caused different effects on the permeability of the boards. The waterproofing additive did not significantly influence the permeability of the panels, only the physical characteristics, with greater emphasis on the mass density and water absorption properties. The painting systems positively influenced the waterproofing capacity of the panels, with the external painting system being more efficient. Regarding the permeability assessment techniques, the Karsten tube showed great variability in the results, demonstrating that this technique is more sensitive to the conditioning variables. And, in the permeability test of NBR 15498, all panels passed the use requirement.
Acesso aberto (Open Access)
Estudo da colmatação em concretos permeáveis para tráfego leve e de pedestres
(Universidade Federal do Pará, 2020-05-28) TEIXEIRA, Mísley da Cruz; CORDEIRO, Luciana de Nazaré Pinheiro; http://lattes.cnpq.br/9126233381230999; https://orcid.org/0000-0001-7931-4042
Permeable concrete is a material mostly used as paving coating to reduce the effects of surface sealing. The material’s susceptibility to clogging is considered as a disadvantage, and it became an object of study in research about this material, as this one which evaluated the effect of clogging on permeable concretes used as pavement coating to light traffic. To this end, an experimental program was elaborated to characterize the material, designed with different percentages of fine aggregate, and to evaluate the evolution of clogging in permeable. The specimens were submitted to characterization and permeability tests after deposition cycles of different types of sediments (sand and clay) and cleaning by aspiration. The results of fresh material characterization corroborated the common assertion in the academic community that the insertion of fine aggregate in mix compositions increases the unit mass and the mechanical strengths and reduces the void percentage and the permeability of the concretes. The clogging tests proved that larger particle size sediments (sand) caused a loss of permeability due to sealing of the upper layer of the specimen, with loss ratios up to 21,13% at the end of the 20th sedimentation cycle, while the smaller particle size sediments (clay) induce to a deeper clogging, with a permeability reduction varying of 8,45% to 16,46%. The maintenance efficiency was proven by total recovery of clogging by sand, and a recovery percentage of 96,85% to clogging by clay. These results make it possible to declare that any particle size can clog the material, but also it is easy to recover its permeability by maintaining/cleaning of the pavement, which confirms that the pavement lifespan and raining capacity are directly associated to its periodic cleaning.