Cementitious Paste
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Evaluation of the influence of sodium and magnesium lignosulfonates on the hydration kinetics of cementitious paste
Abstract Motivated by their low cost, lignosulfonate-based water reducers are the most used type of admixture in the concrete industry worldwide. Due to the plurality of types of lignosulfonates (LSs) and the recent update to the Brazilian standard for admixtures for concrete, the objective of this work was to investigate the impact of sodium (Na-LS) and mag
Cerâmica. Publicado em: 2022
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2. Desempenho térmico-acústico-mecânico de um compósito de matriz cimentícia leve reforçado com casca de arroz
RESUMO Visando desenvolver um novo produto com bom desempenho térmico-acústico-mecânico para servir como alternativa aos materiais comumente utilizados para vedação, foi produzido um compósito a partir de uma matriz cimentícia leve e casca de arroz. A matriz cimentícia consistindo em uma pasta de cimento com ar incorporado, que é intitulada por vár
Matéria (Rio J.). Publicado em: 10/06/2019
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3. Retracción química de pastas de cemento con incorporación de metacaolín
Abstract This study shows the influence of partial replacement of Portland cement by metakaolin in the hydration reactions and chemical shrinkage of cementitious pastes. For this, pastes were prepared using metakaolin replacements of 5, 10 and 20% by mass, and a reference paste, using a constant water/solid ratio of 0,5. Chemical shrinkage was measured conti
Ambient. constr.. Publicado em: 2018-09
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4. Métodos de determinación de la cinética de hidratación mediante la retracción química y parámetros que lo influencian
Abstract Measuring chemical shrinkage provides information about the development of hydration kinetics of cementitious materials. It is also related to the degree and heat of hydration. To determine chemical shrinkage, volume change caused by the hydration reactions in a sample of cement paste under saturation conditions is quantified. There are three method
Ambient. constr.. Publicado em: 2017-12
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5. Effective low-energy mixing procedure to develop high-fluidity cementitious pastes
Preparing a high fluidity paste is a major step in ultra-high performance concrete (UHPC) development with respect to its self-compacting ability as well as its ultra-high strength. In this regard, some experiments have been carried out in order to study various superplasticizer (SP) addition methods and times. Among these procedures, stepwise and delayed me
Matéria (Rio J.). Publicado em: 2016-03
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6. Efeito da adição de serragem de couro tratada quimicamente nas propriedades do cimento Portland
The sheave leather was subjected to chemical treatment in an attempt to immobilize chromium ion in a matrix of cement. Cementitious pastes were obtained by adding different proportions of waste treated solutions (5 and 10% compared to the cement mass) and the pH and setting time (hardening) were measured. Aiming to check the leather influence in Portland cem
Química Nova. Publicado em: 2011
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7. Alteração do comportamento reológico da suspensão cimentícia aplicada sobre substratos porosos. / Modification of rheological behavior of cementitious paste applied on porous substrates.
As argamassas de revestimento são amplamente utilizadas na construção civil e, suas propriedades no estado endurecido são fortemente influenciadas pelas propriedades no estado fresco, as quais dependem de fatores como: materiais empregados; forma de aplicação; e interação entre substrato e argamassa. Os ensaios utilizados para caracterização reoló
Publicado em: 2010
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8. Influencia de la temperatura de curado: hidratación y resistencia de pastas de cemento con escoria
Nowadays it is well known that using blast furnace slag as partial replacements for Portland cement adds technological, economic and environmental benefits. Those are some of the reasons why cements containing several additions (blast furnace slag, fly ash, calcareous material, etc) are commonly used. In recent years, blended cements started to increase amou
Matéria (Rio de Janeiro). Publicado em: 2010
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9. Chaotropic substances and their effects on the mechanical strength of Portland cement-based materials
Portland cement-based materials are present in our everyday life. Over the last two decades, important developments have been made to improve their mechanical strength, mainly through microstructural design. In addition, another promising parameter still remains in the early stages of understanding: that of adhesion. Recently, interdisciplinary researchers h
Materials Research. Publicado em: 2008-06