In search of the reuse of waste from civil construction, studies are presented as an alternative on the insertion of this waste into materials so that they become ecologically viable and at a lower cost. In this scope, there is the red ceramic waste (RCW), which is largely produced both in renovation works and in the stage of transporting construction components such as bricks, slabs, and floors. On the other hand, the use of cement is of great proportions, which raises concerns about the excessive consumption of non-renewable natural resources, especially in large-scale projects. Thus, the study aimed to evaluate the mechanical properties of compressive strength of concrete with partial replacement of cement by RCW and to verify the influence at different breakage ages (7, 14, 21, and 28 days). Five mixes were used, the first with 100% cement, and the others with crushed RCW to replace 5%, 10%, 15%, and 20% of the cement, and the resistance obtained according to percentages and ages was also verified of RCW through the uniaxial compression test. Thus, it was observed that for replacements of up to 15%, the strength losses were not significant, suggesting the feasibility of its use in works with high concrete demands, such as in dams.
O processo de urbanização das cidades do Brasil, em geral, foi influenciado por fenômenos econômicos que, em decorrência, promoveram uma urbanização desenfreada e sem planejamento prévio, em que inúmeras residências no território brasileiro foram desenvolvidas em locais que não se enquadravam nas características de moradia segura, nesse contexto, enquadra-se a zona sul da cidade de Teófilo Otoni em Minas Gerais. A insegurança das moradias em risco é potencializada por fenômenos hidrogeomorfológicos que, em sua maioria, estão localizados em regiões onde a topografia é desfavorável ao desenvolvimento urbano. Os riscos associados às áreas de risco são classificados em 4 estágios crescentes de agressividade, em que R1 é o risco mais leve enquanto R4 é o risco mais agressivo, e para todos os estágios existe uma medida preventiva e de proteção, por isso é importante possuir estudos ambientais direcionados a encostas, enchentes, deslizamentos e outros. Portanto, o comportamento do solo, em diferentes situações, promoverá a análise quanto à intensidade do grau de risco, além de auxiliar no processo de identificação e classificação dos tipos de lâminas a que estão sujeitas as áreas analisadas. Ressalta-se que a zona sul do município de Teófilo Otoni apresenta uma cobertura latossolo predominantemente amarelo-avermelhado, com acentuada ausência de cobertura vegetal, o que aumenta a possibilidade de riscos geológicos e ambientais.
It is a function of the highways to provide comfort, safety, and good rolling conditions to users. Therefore, the roads must be correctly designed showing adequate quality and durability for use. However, what is observed in Brazil is that most of the existing roads are not in good condition due to the number of pathologies found in them, bringing discomfort and insecurity to users. Bearing in mind that the flexible floor is the most used in the country, it is necessary to study the defects found during its useful life, which may be of structural or functional origin, to offer adequate maintenance and possibly better-rolling conditions to those who travel through it. Thus, the present study tackles pathological problems observed on a flexible pavement in the Municipality of Teófilo Otoni, Brazil, its possible causes, and some proposals for measures to be taken in the construction and maintenance processes to reduce the appearance of these pathologies. In addition, the identification and classification of pathologies and nonconformities found in the studied places were carried out. Thus, there was a need for maintenance so that its functionality is not affected, requiring the use of recovery techniques through resurfacing or a sealing layer, improving drainage and milling, which provides longer life and avoids inconvenience to users.
The bridges are important structures for the development of cities, they allow access to places previously isolated due to geological non-conformities or by obstacles such as rivers and valleys, facilitating the access of products and the movement of vehicles and people. The conservation, maintenance, and recovery of these structures are essential for their proper functioning and the safety of their users. However, it is not uncommon to find bridges out of their ideal state of use, presenting a lot of pathologies, and, for these pathologies to be repaired, it can be used various recovery techniques and kinds of treatments. This study aims to analyze the pathologies and their possible options of restorations on the bridge located at João Lopes da Silva Street, Manoel Pimenta neighborhood, in the city of Teófilo Otoni - Brazil. The identification and classification of the pathologies and nonconformities found in the artwork have been carried out. The analyzed bridge needs maintenance so that its functionality is not affected, requiring appropriated recovery techniques such as the use of epoxy resin in cracks, removal of corrosion from reinforcement and application of anticorrosive paints, scarification of concrete in the area in which there is disaggregation, and concreting through forms and drainage devices compatible with local needs, providing a longer life span and avoiding inconvenience for users.
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