Cementitious Pastes
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. Evaluation of Portland pozzolan blended cements containing diatomaceous earth
Abstract Clinker replacement by supplementary cementitious materials (SCMs) is one strategy to reduce CO2 emissions of cement industry. Diatomaceous earth, a natural pozzolan, has been used as SCM. So, this study aimed to evaluate two Portland pozzolan blended cements with distinct content of diatomaceous earth (16DE and 49DE) and compare then with a high cl
Cerâmica. Publicado em: 2019-01
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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. Influência de resíduos de corte de rochas e de blocos cerâmicos moídos na hidratação e no empacotamento de pastas cimentícias
O presente trabalho teve por objetivo estudar a substituição do cimento Portland (CP) por resíduos de corte de rochas (RCR) e de blocos cerâmicos moídos (RBC) em pastas binárias e ternárias. Ensaios de termogravimetria e de análise térmica diferencial foram realizados em várias idades com a finalidade de investigar a evolução das reações de hid
Rev. IBRACON Estrut. Mater.. Publicado em: 2013-08
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7. 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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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. Análise da viabilidade do uso de cinzas agroindustriais em matrizes cimentícias: estudo de caso da cinza da casca da castanha de caju / Feasibility analysis of using agroindustrial ashes in cementitious materials: case study of ash of the rind of the cashew nut
Nowadays, the use of wastes on civil building has been stimulated for it to be one of most consumers of raw materials in their processes and products. The agroindustrial ashes have a prominent place among the wastes with possibilities of application in cementitious materials, because some ashes, such rice husk ash, have pozzolanic activity, and they contribu
Publicado em: 2008