Análise hierárquica para escolha entre agregado natural e areia de britagem de rocha para confecção de argamassas de revestimento

Mattana, Alécio Júnior; Medeiros, Marcelo Henrique Farias de; Silva, Narciso Gonçalves da; Costa, Marienne do Rocio de Mello Maron da

doi:10.1590/s1678-86212012000400006

Cited by 18 publications

(14 citation statements)

References 11 publications

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“…Mortars with treated fibers exhibit a gradual decrease in the air incorporated concentration as the fiber incorporation increases, and all of them have lower concentrations than the reference ratio. This fact corroborates the study conducted by Mattana et al (2012), in which the authors concluded that there is an almost linear tendency between workability and incorporated air concentration, where mortars with lower concentrations also have lower levels of workability. The results obtained for treated fibers are consistent with the theory obtained in the study of these authors.…”

Section: Resultssupporting

confidence: 91%

“…These authors highlighted the importance of NaOH treatments in pineapple fibers, which after treatment began to show higher adhesions with the matrix, which caused a reduction in the incorporated air concentrations for mortars with fibers treated in NaOH solution. On the reference values, Mattana et al (2012) highlighted that mortars should have the incorporated air concentration limited to 20%, while Gomes & Neves (2002) suggest that the incorporated air concentration should be within the range between 8 and 17%. Taking these values as reference, all mortars under study have good behavior with respect to the properties of air incorporated.…”

Section: Resultsmentioning

confidence: 99%

“…Both tests are extremely important in the study of mortars, because while the former determines the water retention capacity of the material, so that there is enough water for the cement hydration reactions, the latter can be considered as an indirect measure of mortar workability, because mortars with higher levels of incorporated air are more plastic. However, special care should be taken for mortars with high levels of incorporated air, as they may exhibit excessive porosities and future pathological problems (Mattana et al, 2012).…”

Section: Methodsmentioning

confidence: 99%

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Development of mortar for laying and coating with pineapple fibers

Azevedo

Marvila

Zanelato

et al. 2020

Rev. bras. eng. agríc. ambient.

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Brazil is one of the largest producers of pineapple in the world, which, in addition to bringing substantial benefits, contributes to increasing waste generation in the stages of processing, aiming at its consumption. The Brazilian environmental legislation has been increasingly more restrictive with respect to the disposal of solid waste, whether domestic, industrial or agro-industrial, which has stimulated studies related to the use of these materials in several matrices. This study aimed to evaluate the potentiality of using the natural fiber of pineapple (Ananas comosus), extracted from its leaves, as reinforcing material in cementitious composites. For this purpose, natural fiber extracted from the pineapple crown was incorporated in different percentages in relation to the cement mass: 0, 2.5, 5, 7.5 and 10%, and the fibers obtained were submerged in aqueous NaOH solution with 5% concentration in volume, for 1 h at room temperature. The following variables were evaluated: consistency, water retention, incorporated air, mass density in hardened state, mechanical strength, water absorption by immersion and capillarity, besides verifying the influence of the mode of fiber incorporation. It was observed that the treatment with NaOH solution and the percentage of natural pineapple fiber incorporated in up to 5% in relation to the cement mass form mortars with technological feasibility.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Development of mortar for laying and coating with pineapple fibers

Azevedo

Marvila

Zanelato

et al. 2020

Rev. bras. eng. agríc. ambient.

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“…The Analytical Hierarchic Process, AHP, is one of the multi-criteria analysis methodologies that assists the decision making in several fields of human knowledge. In civil engineering, the potential of AHP has been little explored, however it is possible to mention examples of studies that have used this tool as a decision making tool, such as: Marchezetti et al (2011), in the treatment of household waste; Lai et al (2008), in public works projects; Costa and Correa (2010), in post-occupation evaluation of buildings; Pereira, Medeiros and Levy (2012) and Mattana et al (2012) in studies on recycling of construction waste for the manufacture of concrete and mortar. According to Costa (2002) the method proposed by Saaty in the early 70s (Saaty, 1978), can be classified as one of the most known and used methods of multi-criteria analysis, aiming at the selection/choice of alternatives in a process that considers different evaluation criteria.…”

Section: Theory Of Hierarchical Analysismentioning

confidence: 99%

Análisis de la dispersión de soluciones conteniendo nanotubos de carbono para su uso en concretos de Cemento Portland

Marcondes

Medeiros

2016

Revista de la Asociación Latinoamericana de Control de Calidad,

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Análisis de la dispersión de soluciones conteniendo nanotubos de carbono para su uso en concretos de Cemento PortlandRESUMENLos nanotubos de carbono (NTC) son estructuras nanométricas de carbono en formas cilíndricas. Para su uso en hormigón, una de las dificultades es su dispersión, enfoque de este trabajo. Se utilizó una herramienta conocida como análisis jerárquico para investigar la eficiencia de dispersión de los NTC en el agua de la mezcla de hormigón. Fueron estudiados 12 maneras de dispersiones en medio acuoso que contiene diferentes productos químicos. Se usaron los nanotubos de carbono de pared múltiple en forma de polvo y los ya procesados, dispersos en agua. El estudio mostró que la herramienta de análisis jerárquico podría constituir una alternativa eficaz para la elección de una mejor dispersión, teniendo en cuenta los factores que influyen en forma sistémica.Palabras clave: Proceso de análisis jerárquico; hormigón; nanotubos de carbón. Analyzing the dispersion of carbon nanotubes solution for use in Portland cement concreteABSTRACTCarbon nanotubes (CNTs) are nanometric carbon structures with cylindrical formats. For use in concretes, one of the difficulties is in its dispersion, focus this work. It used a tool known as hierarchical analysis to investigate the efficiency of the dispersion of carbon nanotubes in concrete kneading water. Were studied 12 forms of dispersions in aqueous medium containing hum Miscellaneous Chemicals. Carbon nanotubes multi-walled in powder form and Processed already dispersed in water were used. The study showed that the hierarchical analysis tool might constitute an alternative to the election of the best choice among the available options, considering the factors of influence in a systemic way.Keywords: Analytical hierarchy process; concrete; carbon nanotubes. Análise da dispersão de soluções contendo nanotubos de carbono para uso em concretos de Cimento PortlandRESUMOOs nanotubos de carbono (NTC) são estruturas nanometricas de carbono com formatos cilindricos. Para uso em concretos, uma das dificuldades está na sua dispersão, foco deste trabalho. Foi usada uma ferramenta conhecida como análise hierárquica. Para investigar a eficiência da dispersão dos nanotubos de carbono na água de amassamento do concreto, foram estudados 12 formas de dispersões em um meio aquoso contendo diversos produtos químicos. Foram utilizados os nanotubos de carbono de paredes múltiplas em forma de pó e os industrializados, já dispersos em água. O trabalho demonstrou que a ferramenta de análise hierárquica poderia se constituir em uma alternativa eficiente para a eleição da melhor dispersão, considerando os fatores de influência de forma sistêmica.Palavras-chave: Análise Hierárquica; concreto; nanotubos de carbono.

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“…Argamassas são materiais de construção confeccionados a partir da mistura de aglomerantes (usualmente cimento Portland e cal hidratada), agregado miúdo e água, podendo ou não conter aditivos e adições químicas e minerais (CARASEK, 2017;MATTANA et al, 2012;NBR 13281, ABNT, 2005). A argamassa utilizada no presente estudo é classificada como argamassa de múltiplo uso.Essas argamassas podem desempenhar duas funções, assentamento de blocos ou revestimento de paredes e tetos.…”

Section: Introductionunclassified

Estudo Da Durabilidade De Argamassas De Argila

Marvila¹,

Goulart²,

Alexandre³

et al. 2019

ABM Proceedings

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Resumo As argamassas são materiais de construção confeccionados a partir da mistura de cimento, cal hidratada, areia e água. Entretanto, a cal hidratada é produzida através de um processo altamente poluidor, por isso, para o presente trabalho foi proposta a substituição desse aglomerante pela argila, material já empregado no setor da construção civil. Apesar de seu uso ser difundido em obras, poucos estudos são desenvolvidos a respeito de tal utilização. Logo, a pesquisa em questão busca resultados a cerca da produção de argamassas com substituição da cal hidratada pela argila em teores de 50 e 100%. Para tanto, o traço utilizado foi 1:1:6 e foram confeccionados corpos de prova para 3 traços, o de referência,o de substituição de 50% e de 100%. Os ensaios realizados para análise da durabilidade dos traços foram de absorção de água por imersão e fervura e por capilaridade. Os resultados obtidos comprovam que a substituição de 100% não atingiu os parâmetros necessários, enquanto a de 50% mostrou-se totalmente possível de ser empregada. Palavras-chave:Argamassas;Durabilidade;Argila. DURABILITY STUDY OF CLAY MORTARS. Abstract Mortars are building materials made from the blend of cement, hydrated lime, sand and water. However, hydrated lime is produced through a highly polluting process, so for the present work it was proposed to replace this binder with clay, a material already used in the civil construction sector. Although its use is widespread in works, few studies are developed regarding such use. Therefore, the research in question seeks results on the production of mortars with replacement of lime hydrated by clay in contents of 50 and 100%. For this, the trace used was 1: 1: 6 and test specimens were made for 3 traces, the reference, 50% and 100% replacement. The tests performed to analyze the durability of the traces were water absorption by immersion and boiling and by capillarity. The results obtained show that the substitution of 100% did not reach the necessary parameters, while that of 50% was totally possible to be used.

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Análise hierárquica para escolha entre agregado natural e areia de britagem de rocha para confecção de argamassas de revestimento

Cited by 18 publications

References 11 publications

Development of mortar for laying and coating with pineapple fibers

Development of mortar for laying and coating with pineapple fibers

Análisis de la dispersión de soluciones conteniendo nanotubos de carbono para su uso en concretos de Cemento Portland

Estudo Da Durabilidade De Argamassas De Argila

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