Resistance To Traction
Mostrando 13-24 de 42 artigos, teses e dissertações.
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13. EFEITOS NAS PROPRIEDADES MECÂNICAS, ELÁSTICAS E DE DEFORMAÇÃO EM CONCRETOS COM ALTOS TEORES DE ESCÓRIA E CINZA VOLANTE. / EFFECTS ON MECHANICAL, ELASTIC AND DEFORMATION PROPERTIES ON CONCRETE WITH HIGH LEVELS OF SLAG AND FLY ASH.
The use of byproducts and industrial waste as pozzolanic, is an alternative to achieve the sustainability, economy and durability in concrete structures. This survey has as its purpose to analyze the effect on mechanical, elastic and deformation properties on concrete with a high level of granulated slag from blast furnace and fly ash in place of Portland bu
Publicado em: 2009
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14. Analysis of the rheological behavior of cement pastes containing tire residues for oil wells / Análise do comportamento reológico de pastas de cimento contendo resíduos de pneu para poços de petróleo
The low tenacity presented by the Portland cement pastes used in the oil wells cementation has been motivating several researches with attention focused on alternative materials. Additives have been developed to generate flexible pastes with mechanical resistance capable to support the expansions and retractions of the metallic covering of the wells that sub
Publicado em: 2009
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15. Estudo da propriedade resistência superficial em revestimentos de argamassa / Study of surface strength property of mortar rendering
The lack of cohesion in mortar renderings corresponds to the loss of mechanical strength among theirs layers due to the weakening of particles bond, a fact which is reflected, among other events, by a low surface resistance of these renderings. Thus, poor surface strength of mortar renderings accelerates their degradation process, leading to a significant re
Publicado em: 2009
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16. Evaluation of shrinkage and creep of self-compacting concrete for application in precast elements / Avaliação de retração e fluencias do concreto auto-adensavel para aplicação em elementos pre-moldados
This project analyzed, theoretically and experimentally, the mechanical and rheological behavior of the selfcompacting concrete (C.A.A.), specially its features according to slow deformation, shrinkage and creep, and its applicability in precast elements. Two compositions of concrete of different classes of resistance were developed, 35 MPa and 55 MPa. In th
Publicado em: 2009
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17. In vitro evaluation of the resistance to traction of different fiber-glass posts used in two protocols for fragile root rehabilitation, with or without composite resin reinforcement / Avaliação, in vitro, da resistência à tração de diferentes pinos de fibra de vidro utilizados em dois protocolos para reabilitação de raízes fragilizadas, com e sem reforço de resina composta
This study evaluated in vitro the resistance of roots to traction of different posts of glass-fiber used in two register to rehabilitation of weakened roots with or out reinforcement of composite resin. Thirty canines had their crowns sectioned and radicular canals endodontically treated. The roots were included in blocks of resin, having exception in 2mm ce
Publicado em: 2008
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18. Argamassa tÃrmica produzida com resÃduos da explotaÃÃo e processamento mineral de caulim e vermiculita expandid
In the last years, mining industry has been mentioned as pollutant sources of the environment, as in case of the kaolin. The pollution occurs due to the great amount of discarded materials (rejects) in the mineral processing and in the ore extraction. These rejects are frequently deposited in the ecosystem without improvement near by the processing plant How
Publicado em: 2008
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19. Compósito de hidroxiapatita e lignina como promotor de osseointegração entre implante metálico e tecido ósseo: estudo experimental / Hydroxyapatite-lignin composite as a metallic implant-bone tissue osseointegration improver: experimental study
This study aimed to evaluate the composite made of synthetic hydroxyapatite associated with lignin, as a promoter of integration between a metal implant (intra-medullar pin, Schanz) and bone tissue. Twenty New Zealand rabbits were used, each of them had both tibia operated: the left one was treated with the composite and the right was not treated, serving as
Publicado em: 2008
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20. Effect of age of the wood of eucalyptus in its chemical and pulpability, and bleachability and properties of the pulp / Efeito da idade da madeira de eucalipto na sua química e polpabilidade, e branqueabilidade e propriedades físicas da polpa
The concern about the quality of the wood that enters a cellulose factory has been focused on many studies, once the productive process and final product are under great influence of the original raw material. Considering the demand for younger trees, the effect of the age of the wood in the chemical constitution and the variables of the process, as well as
Publicado em: 2008
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21. Avaliação da resistência e módulo de elasticidade de osso mineralizado e desmineralizado pelos testes de microtração / Evaluation of the resistance and modulus of elasticity of bone mineralized and desmineralized for the tests of microtensile
The loss of the alveolar bone as resulted of periodontal illness or second to the surgery is sources of innumerable complications for the surgeons dentists, and the solution for such problem if it bases on regenerative procedures. Regeneration is made through bone grafts that establish one scaffold for the tecidual repairing, increasing bone fabrics in the r
Publicado em: 2007
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22. Modelagem computacional de um reator anaeróbico fabricado em polietileno de alta densidade rotomoldado / Computational modeling of a anaerobic reactor manufaturated in polyethilene of high density rotomolding
The present work was developed to evaluate the potential of uses of an anaerobic reactor manufactured in HDPE High Density Polyethylene produced by the rotomolding process in substitution to the conventional reactors built in stonemasonry, working in a batch regime and buried in the soil. The state of tensions and the deformations were assessed using the pro
Publicado em: 2007
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23. Avaliação da qualidade do couro de bovinos de diferentes sistemas de produção na perspectiva do desenvolvimento local
This study aim to evaluate finishing system (precocious and young steers), sex (female, male) and diet effects on the leather characteristics of crossed bovines. It was used 45 animals, being 25 young steers feedlot system and 20 animals in pastures system, receiving supplement protein-energetic. The animals were slaughtered with 26 months and the leathers p
Publicado em: 2007
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24. Repercussões sistêmicas da orquiectomia bilateral, em ratos
This investigation belongs to a line of research, and its purpose was to evaluate the effects of hypogonadism secondary to orchiectomy on the organism of rats. 178 male Wistar rats were used. Of these, 54 were young (Y) and 124 were mature (M). These animals were divided into the following groups: Group 1 control, animals submitted only to incision and sutur
Publicado em: 2007