Navegando por Assunto "Ceramic"

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Acesso aberto (Open Access)
Avaliação da durabilidade de concretos produzidos com agregados graúdos reciclados provenientes de cerâmicas vermelhas com diferentes taxas de pré-saturação
(Universidade Federal do Pará, 2013-09-05) REIS, Felipe José Losada; SOUZA, Paulo Sérgio Lima; http://lattes.cnpq.br/4933212993218783
The amount of waste generated by the construction industry has been calling attention lately due to the size with which acts as the environmental impact of using non-renewable natural sources materials and increasing the amounts of waste produced by the urban environment. In Brazil, this estimate is around 90,000 tons generated per day. The proposed use of aggregate from CW ( construction waste ) as part of structural concrete becomes even more interesting from the moment we are seeking a reduction in costs for the production of concrete , carrying environmentalist mentality when sparing use of natural resources which some are already starting to run out. Banks of sand and pebble sources begin to fade due to the wide use of these aggregates in the concrete produced in Belém and inland cities in the state of Pará. The need for new sources of aggregates makes us seek in construction waste likely sources of aggregates responding in a similar fashion to natural. Considering this proposal, this dissertation evaluated the durability of concrete produced with the addition of ceramic CW through trials of water absorption by capillarity, carbonation, chloride ion penetration and electrical resistivity. To that end, we replaced the natural coarse aggregate by ceramic coarse aggregate by 50%, where this percentage of recycled aggregate was subjected to the rates of pre - saturation of 60 %, 80 % and 100 %. According to the results it can be seen that the presence of RCCA (recycled ceramic coarse aggregate), regardless of the degree of pre- saturation was significant in all the results, the fact that the concrete while leaving more susceptible to loss of durability, it showed a pattern of behavior in relation to the reference mixtures. The closest matches conventional concrete mixtures were made by containing pre- saturated with water at a rate of 80 % ceramic aggregates.
Acesso aberto (Open Access)
Utilização da opção de diferimento na avaliação de implantação de projeto de mecanismo de desenvolvimento limpo em uma empresa de cerâmica vermelha
(Universidade Federal do Pará, 2009-09-25) NEGRÃO, Léony Luis Lopes; ICHIHARA, Jorge de Araújo; http://lattes.cnpq.br/5726366418302065
The evolution of the theory of option pricing considers a set of tools to manage and exploit the value arising from the uncertainty and volatility that expand the parameters of the value-adding to the concepts of managerial flexibility. Within this context, this study was to evaluate the implementation of economically Clean Development Mechanism in a red ceramic company located in Production Arrangement of Bindure, northeastern Para The evaluation aims to demonstrate the value of managerial flexibility of Deferral adjustments made according to the methodology proposed by Copeland & Antikarov (2001), which adds to the traditional evaluation of the discounted cash flow Real Option – OR – that the research found, and it is based by means of literature review to formulate the method. This follows a determination of the essential steps for the analysis of the variables that comprise the model, and has allowed the ordering of the results for the values of the OR considered including value present and managerial flexibility, with the method the company object of research. Finally, as a result of this study concluded that the Theory of Real Options through Option Deferral or Postponement contribute information to assist in management decisions to invest in projects when compared to traditional methods of evaluation are considered as uncertainties inherent in the project as the real environment.