[pt] Os cabos ópticos submarinos estão distribuídos por boa parte dos oceanos ao redor do globo terrestre. Esses cabos começaram a ser instalados com maior intensidade na década de 90, apesar de o primeiro cabo submarino óptico ter sido instalado em 1982 nas ilhas Canárias. Atualmente a importância dos cabos ópticos submarinos é de grande relevância para as comunicações mundiais e vem crescendo muito ao longo do tempo com a demanda por serviços de internet, liderada hoje pelas grandes empresas de tecnologia e de exploração de mídia social, tais como Google, Amazon, Meta, etc. Hoje cerca de 99 por cento de todo o tráfego da comunicação mundial da internet passa pelos cabos submarinos. Os custos para implantação desses cabos são muito altos e, portanto, prover alternativas para a ampliação da sua duração para um período maior do que a sua expectativa de vida útil representa um ganho considerável para todos. Considera-se atualmente pelos fabricantes e organismos de padronização internacional, como o ITU-T (União Internacional de Telecomunicações), uma expectativa média de vida útil de 25 anos. Esta expectativa de vida útil dada para os cabos ópticos foi a principal motivação para o desenvolvimento dessa pesquisa, cujos objetivos visam apresentar evidências que indiquem que a tendência de vida útil dos cabos ópticos submarinos pode superar os 25 anos previstos, e dessa forma contribuir para o atendimento da crescente demanda por transmissão de dados no mundo impulsionada pelos serviços de Internet. A metodologia adotada foi coletar dados de medições com o OTDR em cabos ópticos submarinos ao longo de 24 anos e avaliar a degradação sofrida pelo coeficiente de atenuação em dB/km ao longo do tempo das fibras ópticas dos cabos em operação, e comparar com a degradação sofrida pelos cabos sobressalentes, e avaliar também a degradação das perdas nas emendas submarinas e a sua correlação com a profundidade de instalação no mesmo período. As análises foram realizadas através da avaliação das curvas em arquivos na extensão .Sor obtidas com as medições realizadas pelo OTDR. Os resultados obtidos demostraram que os cabos ópticos em operação sofreram degradações compatíveis com os valores esperados e dados pelo ITU-T, mas também mostraram através da análise de curvas de tendência, que a degradação tem um comportamento logarítmico, e a projeção da curva de tendência para os próximos anos indicou que esses cabos poderão continuar em operação por muito mais anos do que os 25 anos, dados como limite anterior. Foi observado também que a penalidade de potência dada pela perda nas emendas é muito superior a degradação somente nas fibras ópticas, que existe uma correlação positiva entre a profundidade das caixas de emenda e a degradação na emenda e que os cabos sobressalentes degradam muito mais que os cabos em operação. / [en] Submarine optical cables are distributed over most of the oceans around the globe.These cables were installed with greater intensity in the 1990s, despite the fact that the firstoptical submarine cable was installed in 1982 in the Canary Islands. Currently, theimportance of submarine optical cables is very relevant for world communications and hasbeen growing a lot over time with the demand for internet services, led today by largetechnology and social media companies such as Google, Amazon, Meta, etc. Today around 99 percent of all world internet communication goes through undersea cables. The costs forimplanting these cables are very high and, therefore, to provide alternatives for optimizingtheir use by extending their duration for a period longer than their expected useful life,given by international standardization bodies, such as the ITU-T (InternationalTelecommunications Union), and by the manufacturers, which currently is 25 years, is ahuge gain for everyone. The life expectancy given for optical cables was the mainmotivation for the development of this research, whose objectives aim to present evidencethat indicates that the useful life trend of submarine optical cables can reach much morethan the 25 years predicted and in this way contribute to meeting the growing demand fordata transmission in the world, driven by Internet services. The adopted methodology wasto collect measurement data with the OTDR in submarine optical cables over 24 years andto evaluate the degradation suffered by the attenuation coefficient in dB/Km over time ofthe optical fibers of the cables in operation and to compare with the degradation sufferedby the spare cables, and also evaluate the degradation of the losses in the underwater splicesand its correlation with the depth of installation in the same period. The analyzes werecarried out by evaluating the .Sor curves obtained with the measurements performed by theOTDR. The conclusions showed that the optical cables in operation suffered degradationscompatible with the expected values and given by the ITU-T, but also showed through theanalysis of trend curves, that the degradation has a logarithmic behavior, and the projectionof the trend curve for the coming years indicated that these cables could continue to operatefor many more years than the 25 years given as the previous limit. It was also observed thatthe power penalty given by the loss in the splices is much higher than the degradation inthe optical fibers alone, that there is a positive correlation between the depth of the spliceboxes and the degradation in the splice, and that the spare cables degrade much more thanthe cables in operation.

[pt] Assim como qualquer item, uma construção possui uma vida útil que considera o seu nascimento como momento que ela é concebida em projeto, e sua morte como sendo sua demolição final. Durante sua vida uma construção deve passar por manutenções (preventivas, adaptativas e corretivas) que permitem o prolongamento do seu uso, mantendo o seu nível de desempenho dentro do aceitável. Muitas vezes as ações corretivas se dão em períodos curtos de tempo, intervalos abaixo do esperado por seus usuários ou administradores. Obviamente toda intervenção trás consigo um custo financeiro, que cresce dependendo do momento em que ela ocorra dentro da vida da construção. Muito além do custo financeiro, toda atividade causa impacto no meio ambiente, gerando assim um custo ambiental. Determinar o preço ambiental do refazimento de uma obra, em um curto espaço de tempo (menor que o esperado) ilustra o peso deste custo, muitas vezes invisível ou negligenciado, é necessário. A Análise do refazimento de uma obra devido a falhas construtivas que trouxeram uma drástica queda no desempenho no uso do empreendimento demonstrou que o custo ambiental é proporcionalmente muito maior que o custo financeiro esperado. Sabendo que o custo financeiro de correções construtivas ao longo da vida do imóvel cresce em uma progressão geométrica de base 5, permite comparar o quanto o custo ambiental pode desequilibrar a sustentabilidade. Analisando que a intervenção de uma área de 4.200 m quadrados utilizou uma área ambiental de 1.360.000 m quadrados, faz com que os sinais de alerta se acendam demonstrando que a correção de um erro construtivo é muito maior para o meio ambiente que o custo financeiro envolvido. / [en] The world population has been growing at a dizzying rate in recent centuries. And this accelerated population gain brings with it numerous consequences, among them, the need to produce more food, housing and infrastructure. This all leads us to consume more and more natural resources and also increases the generation of waste and waste. The so-called carrying capacity of the planet (condition of sustaining a population), has not evolved in the last centuries in the same index of population growth, that is, humanity is consuming natural resources and generating waste at a speed higher than that which the planet is capable of. produce and absorb. To continue supporting the growing population of the planet, it is necessary to experiment with new technologies, methodologies and processes so that this growth is supported by the tripod of sustainability. The term sustainable development has the most common, and accepted, meaning that points to a tripod of economic growth, environmental preservation and social development. Civil construction is an essential economic sector in the development of any country and society, being responsible for a large fraction of the quality of life of human beings, since they alter the natural environment for better use of space. Understanding the environmental cost of correcting a construction failure is the objective of this work. There are countless studies that point to the financial cost of the so-called rework, but few look at this phenomenon under the environmental lens. The entire life cycle of an enterprise, from its design to its ruin, through its construction and use, causes environmental marks. To correct flaws in works already completed, or in use, there is a need to consume new materials, involving an entire production chain and generating new waste. To produce a certain input that will be used in the correction of a pathology, the following are required: consumption of raw materials to conceive it, energy consumption to manufacture it, waste to produce it, expenses with transportation to take it from the factory to the point of use. All of these steps in the process consume environmental resources. At the other end of the error correction, for the pathology to be eliminated, it must be removed from the site (demolition of a crooked wall, for example) using energy and producing residues from this removal. This waste will be transported to a suitable disposal site, that is, using more energy in this process. In addition, it is still necessary to transform a harmful waste into something less aggressive to the environment. Given the above, the purpose of this research is to understand the size of the impact that a constructive failure can cause to the environment depending on its severity and the moment it is detected. In order to carry out this work, a project was followed up with a short time of use, but which needed major interventions due to the flaws found. With the analysis of the presented pathologies it was possible to measure how much they weighed, and will weigh, to the environment. In addition, analyzing the origin and the correction method implemented will allow to index each of the flaws found environmentally, measuring how much the planet s carrying capacity could have been preserved had these defects not occurred. The useful life of a building can be understood as the time interval from its birth, marked by its design concept, until its death with its demolition and / or disuse. Project useful life (VUP) must be defined by the developer and the project designer. VUP, despite being a temporal measure, has an economic character, being defined as the best relation between global cost versus time to enjoy the good. Preventive maintenance takes place constantly and aims to increase the life of the project, whereas corrective maintenance must occur in a timely manner and correcting failures in points that are already performing below the desired level. Adaptive maintenance has the objective of adjusting the enterprise to receive new technologies, new equipment and to comply with the new legislation The economic character of the useful life of a good is characterized by its global cost, which must be defined as the sum of the cost of acquisition, or construction, of the good and the cost of maintenance throughout its life. The total cost of a construction during its life includes the costs of planning, design, construction, operation, maintenance and demolition. These construction costs represent between 15 percent and 20 percent of the total cost; 80 percent of the amount is spent on operation and maintenance and only 2 percent to 5 percent of the amount is spent on planning and design (conceptual and detailed). The total cost of a construction during its life includes the costs of planning, design, construction, operation, maintenance and demolition. These construction costs represent between 15 percent and 20 percent of the total cost; 80 percent of the amount is spent on operation and maintenance and only 2 percent to 5 percent of the amount is spent on planning and design (conceptual and detailed). The useful life of a building, for example, goes through the useful life of its components such as its foundations, superstructures, hydro-sanitary installations, electrical installations, facades, internal cladding, paintings and waterproofing. Studies show that corrective maintenance costs up to five times more than preventive maintenance. Corrective maintenance is often required in shorter time cycles than initially imagined (and desired) by those responsible for the enterprise. Currently, numerous failures in new construction (or with little use) are verified, such as buildings, bridges, roads, streets and public supply networks, which range from faults of all kinds, from simple to catastrophic. The service life can be extended with preventive, corrective and adaptive maintenance interventions. The extension of useful life is directly impacted on the overall cost of construction. The lowest global cost system is usually not the lowest initial cost nor the longest lasting. Seeking to optimize the cost-benefit ratio is the best option for society. The useful life of a building must be supported by the tripod of socio-environmental importance, cost of implementation and cost of maintenance over the years. When investors seek to save money by building buildings with low quality standards, and with low maintenance ease, they increase the cost of future maintenance. At the other end of the real estate market, users do not carry out preventive maintenance because they consider its cost to be high, often allowing certain components of the project to come close to the level of unacceptable performance and only then carry out the maintenance that has now become corrective, costing financially more than the preventive maintenance previously denied. The Sitter rule, or Law of 5, determines that the relative cost of an intervention grows in a geometric progression of ratio 5 over time in the project and its maintenance. The sooner a problem is perceived, the lower its cost. Sustainability, despite not having a unanimous definition, is a concept that must integrate aspects of social-ecological dimensions, economic factors, and the short, medium and long term advantages. Putting together all the concepts expressed by several authors, sustainability can be defined as the attempt to achieve economic and social growth while preserving the finite resources of the environment. For more than 40 years, humanity s demand for nature has exceeded the planet s replacement capacity. Currently 1.5 Earth planets would be needed to provide the ecological services that were used in the 1980s. Trees are cut faster than they can ripen, more fish are caught than the oceans can replenish and more carbon is emitted than forests and oceans can absorb. The carrying capacity of the planet has been compromised in a way never before experienced by humanity, to meet the current lifestyle of the population. Consumerism is seen as a behavior that leads to an increase in production and, consequently, to economic progress, but this equation is limited by resources that cannot sustain unlimited growth. Finite spaces cannot absorb waste that grows indefinitely. The carrying capacity of a system is obviously influenced by factors such as average income, material expectations and level of technology, that is, energy and material efficiency. There are few systems of indicators that analyze sustainable development in a generic way. The most commonly used indicators globally are as follows: (1) Sustainability Panel, (2) Sustainability Barometer and (3) Ecological Footprint. The indicator called Ecological Footprint has the advantage of being easily visualized, since the Ecological Footprint represents the ecological space necessary to sustain a given system, or community. It is a simple tool that counts the flows of matter and energy that enter and leave an economic system, converting them into areas of land, or water, necessary to sustain such a system. The Ecological Footprint is a method that transforms the consumption of raw materials and the assimilation of waste from an economic system, or from a human population, into an area corresponding to productive land or water. Using this method, it is possible to calculate the area of the ecosystem needed to ensure the eternal survival of a given population or system. Once this equivalent area of the ecosystem has been determined, it is possible to visualize how much it appropriates the carrying capacity of the planet as a whole. In fact, the size of the Footprint can change depending on the new technologies developed, which can be more or less resource-consuming and wastegenerating. The calculation method for measuring the Ecological Footprint, although easily intuitive, is difficult to carry out with regard to data collection.