Efecto de empaquetamiento de las partículas en la durabilidad de los hormigones de alto desempeño

Castro, A. L. de; Ferreira, Fernanda Giannotti da Silva

doi:10.4067/s0718-50732016000200003

Cited by 8 publications

(7 citation statements)

References 13 publications

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“…Therefore, the water/cement ratio increased, and so did the absorption coefficients. This had already been observed by Zhang and Zong (2014), Castro and Ferreira (2016), Gans (2017) and Pinto et al (2018), and it is mainly due to the porosity in the concrete microstructure and its permeability, given that both are parameters significantly influenced by the water/cement ratio. In addition, according with the Comité Euro-International du Béton (CEB 192, 1989), the concrete may be qualitatively classified as good, average or poor, according to its absorption by immersion level.…”

Section: Water Absorption By Immersionmentioning

confidence: 53%

Correlations between water absorption, electrical resistivity and compressive strength of concrete with different contents of pozzolan

Medeiros-Junior

Munhoz

Medeiros

2019

Revista de la Asociación Latinoamericana de Control de Calidad,

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This research confronts the following concrete properties: water absorptions (by immersion and capillarity), electrical resistivity and compressive strength. Concrete mixtures with two types of cement were tested. Results showed that concretes with higher content of pozzolan had higher resistivity and greater absorption by capillarity, for water/cement ratios lower than 0,60. This behavior is attributed to reduced pore diameters and microstructure densification. However, for water/cement ratio of 0,60, concrete with lower content of pozzolan presented higher absorption by capillarity. It was observed that the compressive strength and the electrical resistivity behaved inversely proportional to the water/cement ratio, and the absorption by immersion and capillarity are directly proportional to the water/cement ratio. Correlations with high determination coefficients were found between tests.

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Section: Water Absorption By Immersionmentioning

confidence: 53%

Correlations between water absorption, electrical resistivity and compressive strength of concrete with different contents of pozzolan

Medeiros-Junior

Munhoz

Medeiros

2019

Revista de la Asociación Latinoamericana de Control de Calidad,

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“…Enquanto a areia tem sua composição dentro da zona ótima inferior e zona utilizável inferior, a composição granulométrica do agregado reciclado de placas cerâmicas foi feita por peneiramento, para ficar na zona ótima, a fim de se obter o melhor empacotamento das partículas, propiciando uma boa resistência mecânica e trabalhabilidade, reduzindo os espaços vazios entre os grãos [34]. O agregado reciclado e o agregado natural possuem diferença de aproximadamente 19 e 36% na quantidade de massa retida acumulada nas peneiras com aberturas de 2,4 e 4,8 mm, respectivamente.…”

Section: Figura 3 Composição Granulométrica Dos Agregadosunclassified

Análise da influência da incorporação parcial de resíduos de placas cerâmicas com aditivo cristalizante em argamassas

Silveira,

Gurkewicz,

Piva

et al. 2023

Cerâm. ind.

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A região sul catarinense é reconhecida mundialmente como polo cerâmico, e como toda indústria, é grande geradora de resíduos. A construção civil também afeta o meio ambiente, em função da atividade de mineração e o enorme consumo de recursos naturais. Para diminuir o impacto ambiental, uma alternativa é inserir os resíduos de placas cerâmicas (RPC) na construção civil. No entanto o RPC possui uma alta absorção de água, prejudicando o desempenho das argamassas. Mas é possível amenizar a absorção de água com o uso de aditivos cristalizantes. Desse modo, o presente artigo tem objetivo de analisar as propriedades físico-mecânicas das argamassas, com substituição parcial da areia por RPC tratado com aditivo cristalizante. Para isso, foi elaborado um traço de referência e quatro traços com tratamentos distintos. O tratamento consiste na pré-molhagem do RPC em soluções com porcentagens diferentes de aditivo + água, deixando-os em tratamento durante 6 e 24 h. É possível verificar que a porosidade do RPC influenciou nos resultados obtidos. O traço com maior tempo de tratamento e com aditivo em sua composição mostrou melhores resultados em comparação aos demais traços, confirmando o tratamento com aditivo cristalizante. As propriedades mecânicas da argamassa tiveram resultados adequados.

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“…Na slici 1 prikazan je kronološki razvoj različitih metoda optimizacije pakiranja čestica [6,12,13,14].…”

Section: Metode Optimizacije Pakiranja čEsticaunclassified

The influence of particle packing density optimization on the reduction of the amount of Portland cement in concrete

Štefanec¹,

Gabrijel²

2022

Proceedings of 8th Symposium on Doctoral Studies in Civil Engineering

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In order to reduce the emission of CO2 and the harmful impact on the environment during the production of concrete, it is important to think about the design of concrete mixes. In practice, the amount of cement is reduced by using cement with mineral additives (fillers) or, more rarely, by replacing part of the cement with mineral additives during the preparation of concrete. This does not go into the detailed characterization of the additives, nor the analysis of possible physical and chemical interactions between the particles, which is why the real potential of replacing part of the cement is often not realized. A fundamental approach to the mentioned problem can be realized through the theory of particle packing. In this paper, the existing methods of optimizing particle packing are presented, an insight is given into the most important parameters that define particle packing, and finally, a review of the literature shows how the amount of Portland cement in concrete mixes is reduced in recent times by optimizing the density of particle packing.

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Efecto de empaquetamiento de las partículas en la durabilidad de los hormigones de alto desempeño

Cited by 8 publications

References 13 publications

Correlations between water absorption, electrical resistivity and compressive strength of concrete with different contents of pozzolan

Correlations between water absorption, electrical resistivity and compressive strength of concrete with different contents of pozzolan

Análise da influência da incorporação parcial de resíduos de placas cerâmicas com aditivo cristalizante em argamassas

The influence of particle packing density optimization on the reduction of the amount of Portland cement in concrete

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