Mix Proportions
Mostrando 13-24 de 24 artigos, teses e dissertações.
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13. Influência da cal hidratada nas idades iniciais da hidratação do cimento Portland - estudo em pasta. / Influence of hydrated lime on initial stages of hydration of Portland cement - paste study.
In the last decades, scientific and technological progress has shown a significant advance in the process of obtaining lime; however, there is gap knowledge with relation to its action when employed together with Portland cement. The use of lime in finishing mix mortars has only been positively associated to the fresh state plasticity and ability to deformat
Publicado em: 2008
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14. Influência do agregado graúdo reciclado de resíduos da construção predial nas propriedades do concreto fresco e endurecido
Recycling waste materials is an efficient way to hinder environmental, social and economic impacts of the civil construction industry. This dissertation aimed at verifying the behavior of different concretes made of coarse recycled aggregate (AGR), mineral fractions collected from the waste (RCD) of a high- rise apartment building (multiple floor building).
Publicado em: 2007
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15. Estudo comparativo das propriedades mecânicas do concreto produzido com água tratada magneticamente
TThe related work, as a perspective of concrete improvement, seeks to analyze concrete behavior with magnetically treated water compared with the obtained results on conventionally produced concrete (common or tap water). The objective is to evaluate the effects of the magnetical treatment water in the workability of the concrete as well as on the mechanical
Publicado em: 2006
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16. Estudo do aproveitamento de resíduos de cerâmica vermelha como substituição pozolânica em argamassas e concretos
Portland cement based materials have great potential for providing good waste immobilization solutions, which are both cost effective and also promotes the sustainable development of modern industrial activities. Indeed, several industrial wastes have successfully been used in constructions worldwide, most of them from steel and energy manufacturing processe
Publicado em: 2005
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17. Estudo do aproveitamento de resíduos de cerâmica vermelha como substituição pozolânica em argamassas e concretos / Study the use of waste clay products as pozzolanic replacement in mortars and concrete
Portland cement based materials have great potential for providing good waste immobilization solutions, which are both cost effective and also promotes the sustainable development of modern industrial activities. Indeed, several industrial wastes have successfully been used in constructions worldwide, most of them from steel and energy manufacturing processe
Publicado em: 2005
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18. Estudo de argamassas com agregados reciclados contaminados por gesso de construção. / A study on mortars produced with CDW recycled aggregates containing cypsum plaster as impurity.
This is an abstract of a Master of Science project carried out at EPUSP, Universidade de São Paulo, Brazil, aimed at investigating the effects of the use of recycled aggregates contaminated by small contents of gypsum plaster on masonry mortars. In the presence of moisture and by the action of gypsum minerals or other more complex ones that may occur, there
Publicado em: 2004
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19. ESTUDO EXPERIMENTAL DAS PROPRIEDADES DO CONCRETO DE ALTO DESEMPENHO / EXPERIMENTAL STUDY OF HIGH PERFORMANCE CONCRETE PROPERTIES
Projetos estruturais que empregam concretos com resistências mais elevadas, ou seja, maiores que 40 MPa, nomeados Concretos de Alto Desempenho, são cada vez mais freqüentemente utilizados. Sabe-se, entretanto, que as propriedades destes concretos são diferenciadas daquelas dos concretos considerados convencionais, necessitando-se estudos que visem, princ
Publicado em: 2002
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20. Estudo da emanação de radonio em amostras de concreto com composições diferentes
The radon-222 is a noble radioactivity gas present in uranium-238 decay chain. The concrete components (cement and aggregates) have their raw materials extracted from crust that contains uranium as impurity. The 238U contained in these components will decay following its decay chain until 206Pb, passing by radon that can diffuse to indoor air of dwellings. T
Publicado em: 2002
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21. COMPOSITE MATERIALS REINFORCED WITH NATURAL FIBRES: EXPERIMENTAL CHARACTERIZATION / MATERIAIS COMPÓSITOS REFORÇADOS COM FIBRAS NATURAIS: CARACTERIZAÇÃO EXPERIMENTAL
This thesis studies both the short-term and long- term behaviour of sisal and coconut fibre reinforced mortar composites.The experimental work involved extensive laboratory testing to determine the physical and mechanical properties of the fibre reinforcement and to study the influence of fibre type, volume fraction, fibre length, fibre arrangement and matri
Publicado em: 1997
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22. Utilização de farinhas compostas de trigo e sorgo na fabricação de pão
The incorporation of sorghum (Sorghum vulgare) flour into the locally produced wheat flour has.the principal objective of dirnllrlsh ing wheat importation by employing Brazilian raw materials. The effect of adding increasing amounts of sorghum flour to local wheat flour was studied in flour-water system (FWS) and flour-wat er-ingredients system (FWIS). There
Publicado em: 1980
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23. A Fermentor System for Regulating Oxygen at Low Concentrations in Cultures of Saccharomyces cerevisiae
The growth of yeast cells to high densities at low, but constant, oxygen concentrations is difficult because the cells themselves respire oxygen; hence, as cell mass increases, so does oxygen consumption. To circumvent this problem, we have designed a system consisting of a computer-controlled gas flow train that adjusts oxygen concentration in the gas flow
American Society for Microbiology.
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24. Prognostic value of bronchoalveolar lavage in sarcoidosis: the critical influence of disease presentation.
There has been considerable disagreement about the prognostic value of bronchoalveolar lavage lymphocyte measurements in patients with sarcoidosis. This study looks at the influence of the type of disease presentation and the time since onset of symptoms on lavage fluid lymphocyte profiles in 99 patients studied at the time of their initial diagnosis. Patien