Ordinary Concrete
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Monitoring reinforcement corrosion of concretes designed for nuclear facilitie
ABSTRACT The facilities designed for the peaceful activities of nuclear energy are made with different materials, among them, reinforced concrete. This material, in addition to being structural, is a barrier for isolation and confinement from the environment of the radioactive materials. One of its degradation mechanisms is the corrosion of the reinforcement
Matéria (Rio J.). Publicado em: 19/07/2018
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2. Steel corrosion assessment by electrochemical impedance on metakaolin blended mortars
Since Corrosion of reinforcing steel in concrete is the cause of major economic losses, Portland cement has been traditionally replaced by cements blended with pozzalanic materials, most of which have been found to reduce the corrosion of steel. This paper shows the results of an experimental research aimed to investigate the corrosion of reinforcement in mo
Mat. Res.. Publicado em: 05/11/2013
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3. Ensino da escrita em inglês com foco no desenvolvimento: uma análise das concepções de língua e escrita dos alunos / Teaching writing in English with focus on development: an analysis of students\ conceptions of language and writing
This research investigates the conceptions of language and writing of six students in an English writing course based on the conceptual approach (FERREIRA, 2005), a perspective for teaching second language writing which joins the Australian school of genres with a pedagogy based on Activity Theory called Movement from the Abstract to the Concrete (MAC). Base
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/03/2012
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4. Corrosion of reinforcing bars embedded in alkali-activated slag concrete subjected to chloride attack
Steel bar embedded in an alkali-activated slag (AAS) concrete was tested under complete immersion, in 3.5% NaCl solution by weight of the slag. Ordinary Portland cement (OPC) was also tested for comparative purposes and exposed to the same solution. Monitoring of open-circuit potential, polarization resistance measurement and electrochemical impedance spectr
Materials Research. Publicado em: 13/12/2011
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5. Chloride diffusivity in red mud-ordinary portland cement concrete determined by migration tests
Red mud, which is a solid waste produced in the alumina production process, is classified as dangerous due to its high pH. In this work, the concentration of chlorides was monitored by measuring the conductivity of the anolyte, which initially was distilled water. The steady and nonsteady-state chloride diffusion coefficients were estimated from the "time la
Mat. Res.. Publicado em: 06/05/2011
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6. Generalized-generalized entropies and limit distributions
Limit distributions are not limited to uncorrelated variables but can be constructively derived for a large class of correlated random variables, as was shown e.g. in the context of large deviation theory [1], and recently in a very general setting by Hilhorst and Schehr [2]. At the same time it has been conjectured, based on numerical evidence, that several
Brazilian Journal of Physics. Publicado em: 2009-08
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7. In vertigo of life: the poetry of Ferreira Gullar / Na vertigem da vida: a poesia de Ferreira Gullar
The researchers purpose is to think a possible oscillation that characterizes Ferreira Gullars poetic work regarding the approximation and the distance of the modern poetry categories. The study of Gullars dialogues with the artistic vanguard assumed as the exploration of the powers of the language diverted from its own ordinary use, leads to the following q
Publicado em: 2008
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8. Estudo da fluência em vigas de concreto reforçado com fibras de aço, com aplicação de conceitos da mecânica da fratura / Creep analysis of steel fiber reinforced concrete based on beam tests and fracture mechanics concepts
Despite of the well known advantages of steel fiber addition to concrete (SFRC), especially the toughness improvement, only a few number of studies has been developed about creep on these composites. The main purpose of this research is to investigate the feasibility and inherent difficulties related to a particular creep evaluation method. This method is ba
Publicado em: 2008
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9. Concepções de infância e de educação infantil que permeiam a prática docente
This investigation proposes to analyze the teaching practice in the Child Education, considering the childhood and the Child Education conceptions declared by the teachers. It was opted as methodological approach the qualitative conception of research, marking a critical perspective of the subjects, and their relations in the educational processes. It was pr
Publicado em: 2008
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10. STUDY ABOUT THE BEHAVIOR OF SLAB-ON-GRADE CONCRETE FOUNDATION SETTLE ON SEDIMENTARY SOIL IN THE SANTA MARIA REGION / ESTUDO DO COMPORTAMENTO DE SAPATAS DE CONCRETO ARMADO ASSENTES SOBRE SOLO SEDIMENTAR DA REGIÃO DE SANTA MARIA
Superficial foundations transfer the load to soil by the distributed tensions on the base of the foundation element and, projects are normally conditioned to crack and displacement criteria. In the ordinary engineering practice, especially in the Santa Maria region, due to the absence of constitutive models and experimental data, empirical and semi-empirical
Publicado em: 2007
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11. Concreto projetado elaborado com cimentos especiais: análise segundo parâmetros de durabilidade. / Shotcrete elaborated with especial cements: analisys according to durability parameters.
The present work involves an experimental study with dry-mix shotcrete aiming at the behavior analysis, through indicative testing of the main durability parameters of national and international specifications. The research involves the use of four cement types especially formulated for use in shotcrete use in comparison with two other cements that are tradi
Publicado em: 2007
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12. Contribution to the study of the bond between steel bars and self-compacting concrete / Contribuição ao estudo da aderência entre barras de aço e concretos auto-adensáveis
A busca por novos materiais estruturais visa a melhoria da qualidade e desempenho das estruturas, impulsionando o desenvolvimento científico e tecnológico. O concreto auto-adensável surgiu da necessidade de se dispensar o difícil e oneroso trabalho de vibração do concreto, sendo definido como um material capaz de fluir dentro de uma fôrma, passando pe
Publicado em: 2006