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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Tepelně izolační lité žárobetony / Heat insulating moulded refractory concretes

Bednárek, Jan January 2014 (has links)
The thesis deals with the possibility of specific weight lowering of kaolin suspensions using air-entraining agents. These agents are usually used as concrete admixtures. The goal of the thesis is to verify an alternative possibility of creating porous structure in kaolin suspensions in order to prepare heat insulating moulded refractory concretes without using lightweight fillers. The effect of several air-entraining agents was compared, after that the dosage of agent and mixing conditions were optimized. The stabilization of prepared foams and practical application of selected agents were also part of the thesis.
2

VIABILIDADE DO PROCESSO OPERACIONAL DA CENTRAL DE TRATAMENTO DE RESÍDUOS DA CATURRITA (CTRC) SANTA MARIA, RS / VIABILITY STUDY OF THE OPERATIONAL PROCESS OF CATURRITA CENTRAL RESIDUES TREATMANT PLANT (CTRC) SANTA MARIA, RS

Salamoni, Rafael Hollweg 19 December 2008 (has links)
This approach identifies some physical characteristics of the residues and the operational procedures converning the destination of these residues at the Central of Residues Treatment of Caturrita (CTRC), located on the city of Santa Maria (RS). The CTRC is composed by unit of selection, unit of compostage and sanitary embarement, wich supports a population of nearly 500.000 habitants, and has a 30 years estimated life-time for the enterprise. It is located in area of 24, 7 hectares, within the Vicinal Road to Santa Maria (Boca do Monte). The enterprise is licensed to daily receive 300t of residues. The physical characteristics and the operational procedures were taken and executed with the residue from the selection unit. It evaluated the specific mass and the operational procedures of compacting, receiving of residues, transport of residues to the landfill place, utilized machines and life-time of the sanitary embarement for the actual operational system and for the operational system that uses a press to compact the residues. Sixteen packs of compact residues using a vertical press. The evaluation results showed a significant operational and economic qualification in the operational system of compacting residues in press. This is due to the fact that the residues were compacted in smell volumes, forming easy operated packs with higher values of specific mass. The compactation of the residue in a vertical press provided an increase in the specific mass and consequently a volumetric reduction of 5, 33 times. These residues were compacted in sunny and rainy days and with presence of organic matter, and for that, the compactitation generated effluent in significant amount, wich any was would be generated in the sanitary embarement. There was no way to set, through the availall data, the days and intervals of peak hours, but it was verified that the amount of processed residues by hour is lawer than to the amount produced with the operational processing of presses of the type MAC 108L/1. The compaction process showed a gain in efficiency in charge of 28.6% and the economy in the consume of diesel of 31,5%. The managing of machinery to compact residues in press demonstrated a reduction in the number of utilized equipments and the life-time of the sanitary sanitary embarement for compacted residues by press would pass from 30 years for 39, 1 years. / Neste trabalho foram identificadas algumas características físicas dos rejeitos e os procedimentos operacionais da destinação destes rejeitos na Central de Tratamento de Resíduos da Caturrita, (CTRC) localizada no município de Santa Maria (RS). A CTRC é composta por unidade de triagem, unidade de compostagem e aterro sanitário e atendendo uma população de 500.000 habitantes, tendo uma vida útil estimada de 30 anos. Possui uma área de 24,7ha, localizada junto à Estrada geral da Boca do Monte. O empreendimento está licenciado para receber 300t de resíduos diariamente. O estudo das características físicas e os procedimentos operacionais foram realizados com o rejeito da unidade de triagem. Avaliou-se a massa específica e os procedimentos operacionais de compactação, recebimento de resíduos, transporte de rejeitos para o aterro sanitário, maquinários utilizados e vida útil do aterro sanitário para o sistema operacional atual e para sistema operacional que utiliza prensa para compactar os rejeitos. Foram confeccionados 16 fardos de rejeitos compactados em prensa vertical. Os resultados mostraram uma significativa qualificação operacional e econômica no sistema operacional de compactação de rejeitos em prensa. Isto é devido ao fato dos rejeitos serem compactados em pequenos volumes e formarem fardos de fácil operação com maiores valores de massa específica. A compactação de rejeito em prensa vertical proporcionou um aumento da massa específica e conseqüentemente uma redução volumétrica de 5,33 vezes. Estes rejeitos foram compactados em dias secos e chuvosos e com presença de matéria orgânica, e por isso, a compactação gerou efluente em quantidade significativa, mas que por sua vez seria gerada no aterro sanitário. Não houve como dimensionar através dos dados encontrados os dias e intervalos de horas de pico, mas verificou-se que as quantidade de resíduos processados por hora são inferiores à capacidade de processamento operacional de prensas do tipo MAC 108L/1. O processo de compactação apresentou um ganho de eficiência na carga de 28,6% e uma economia de 31,5% no consumo de diesel. O dimensionamento de maquinários para compactar os rejeitos em prensa demonstra uma redução no número de equipamentos utilizados e a vida útil do aterro sanitário para rejeitos compactado em prensa passaria de 30 anos para 39,1anos.

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