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Influência de diferentes agentes de fixação na resistência de união, por tração, de ligas metálicas fixadas à dentina.
(1990-12-01)
They were casted pieces using three kinds of alloy (Ni-Cr, Ag-Sn and Cu-Al) with circular and smooth surface. They were cemented to human teeth, on occlusal surface, grounded at dentin level, through three different materials ...
Influência de diferentes agentes de fixação na resistência de união, por tração, de ligas metálicas fixadas à dentina.
(1990-12-01)
They were casted pieces using three kinds of alloy (Ni-Cr, Ag-Sn and Cu-Al) with circular and smooth surface. They were cemented to human teeth, on occlusal surface, grounded at dentin level, through three different materials ...
Estudo comparativo das propriedades reológicas e mecânicas dos concretos produzidos com diferentes aditivos redutores de água
(Universidade Federal de Minas GeraisUFMG, 2016-06-17)
Concrete is one of the materials sold worldwide, and the production of concrete companies is expected to reach 72.3 million m3 in 2017, and its components are obtained from non-renewable sources such as aggregates, cement ...
Avaliação do comportamento reológico de pastas de cimento para poços de petróleo com adição de plastificantes
(Universidade Federal do Rio Grande do NorteBRUFRNPrograma de Pós-Graduação em Ciência e Engenharia de MateriaisProcessamento de Materiais a partir do Pó; Polímeros e Compósitos; Processamento de Materiais a part, 2006-10-16)
The isolation of adjacent zones encountered during oilwell drilling is carried out by Portland-based cement slurries. The slurries are pumped into the annular positions between the well and the casing. Their rheological ...
Efeito da redução do teor de cimento no desempenho de matrizes e compósitos cimentícios
(Universidade Tecnológica Federal do ParanáCuritibaBrasilGraduação em Engenharia CivilUTFPR, 2016-11-23)
The main purpose of this research is to investigate the effect of partial replacement of cement by fine particles materials – limestone and nanosilica – on the performance of cementitious matrices and composites. The concern ...
Influência do tempo de adição do policarboxilato em pastas de cimento Portland para cimentação de poços petrolíferos
(Universidade Federal do Rio Grande do NorteBrasilUFRNPROGRAMA DE PÓS-GRADUAÇÃO EM QUÍMICA, 2015-07-10)
Cement pastes used in cementing oil wells operations are prepared according
to the specific characteristics of each well. The physical properties requested for
each folder formulation depend on the temperature and pressure ...
Desenvolvimento de sistemas de aditivos químicos para aplicação em cimentações de poços de petróleo
(Universidade Federal do Rio Grande do NorteBRUFRNPrograma de Pós-Graduação em Ciência e Engenharia do PetróleoPesquisa e Desenvolvimento em Ciência e Engenharia de Petróleo, 2010-06-18)
The primary cementing is an important step in the oilwell drilling process, ensuring the mechanical stability of the well and the hydraulic isolation between casing and formation. For slurries to meet the requirements for ...
Synthesis and characterization of portland cement manufactured with carbon nanotubes
(Universidade Federal de Minas GeraisUFMG, 2012-12-07)
Portland cement (PC) is one of the most consumed products of the world. Its derivates (concrete, mortar, paste) have good compressive characteristics, but on the other hand have poor tensile behavior. Carbon nanotubes have ...