Desenvolvimento de método para medida de permeabilidade superficial de revestimentos de argamassa.

Sentone, Daniel Tourinho

doi:10.11606/d.3.2011.tde-11082011-123629

Cited by 5 publications

(9 citation statements)

References 16 publications

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“…Whereas for Sentone (11), water transport can occur by three phenomena: diffusion, capillarity and permeability. These phenomena, according to the author are determined by the porous structure of the materials and their driving forces.…”

Section: External Forces and Water Transport Mechanismsmentioning

confidence: 99%

“…Setting the definition, the author infers that there is a natural tendency for molecules to migrate from regions of higher concentration to smaller ones in order for equilibrium to occur. And it remembers that for the destination to succeed successfully it must be empty and in the migrating atoms there must be enough energy to break the bonds with the neighbors and generate the dragging movement (11).…”

Section: Diffusionmentioning

confidence: 99%

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Influence of Granulometry of the Small Aggregate on the Permeability of Wall Cement Coating

Mesquita¹,

Liotto²,

Amorim³

et al. 2019

IJAERS

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The performance of the vertical sealing elements is determined by the level of protection to which they are subjected. Construction processes are changing and cementitious coatings are increasingly taking place among current construction options. On the other hand, the weather has its increasingly aggressive and more evident incidence. The performance standard sets the guidelines for seal manufacturers to meet expected quality standards. Given the above comes the importance of evaluating the best particle size composition to obtain the ideal mortar manufacture. Water transport mechanisms are the actors in this permeability process with the effective participation of diffusion and capillarity. The present study proposes observations about the water absorption of cementitious coatings manufactured with three sand granulometry (fine aggregate). The mixture containing the fine sand obtained the lowest absorption while the mixture with the highest grain size presented the highest absorption and the highest flow rates.

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Section: External Forces and Water Transport Mechanismsmentioning

confidence: 99%

Section: Diffusionmentioning

confidence: 99%

Influence of Granulometry of the Small Aggregate on the Permeability of Wall Cement Coating

Mesquita¹,

Liotto²,

Amorim³

et al. 2019

IJAERS

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“…A partir da aplicação deste método não destrutivo, se obtém dados do coeficiente de permeabilidade (kT), da espessura da camada onde se tem a leitura (L), da pressão (Pi) e do tempo de leitura em segundos [14]. …”

Section: Introductionunclassified

“…Sentone [14] citou em seu trabalho que existem diversos métodos para se avaliar a permeabilidade ao ar em materiais porosos, assim como equipamentos e técnicas diferenciados, podendo ser medida em laboratório ou, mesmo, in situ.…”

Section: Introductionunclassified

Avaliação de testemunhos de concreto compactado com rolo, com indícios de ataque por sulfato de origem interna, pelo ensaio de permeabilidade ao ar - método Torrent

Medeiros

Slominsky

Ribeiro

et al. 2017

Simpósio Paranaense De Patologia Das Construções

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Resumo: Agentes agressivos são conduzidos ao interior do concreto pelo fenômeno de transporte de fluidos, através da porosidade sob condições de pressão entre o material e o meio externo. Reações com as substâncias químicas provenientes do meio externo ou como subprodutos de reações dos componentes do concreto, tais como o ataque de sulfato de origem interna, acontecem na presença de água contida nos poros. A absorção pelo concreto depende da porosidade devido à interconexão dos poros capilares, principalmente do tamanho dos poros. A permeabilidade do concreto é considerada como um parâmetro de referência para as análises de durabilidade de estruturas de concreto. Um método não destrutivo válido para a avaliação da permeabilidade de concretos é o proposto por Torrent, visando avaliar e classificar a qualidade do concreto. No presente trabalho, o objetivo foi avaliar a permeabilidade, pelo método de Torrent, de testemunhos de concreto compactado com rolo (CCR) com indícios de ataque por sulfato interno, extraídos de uma barragem de usina hidrelétrica. Os resultados obtidos com este método de ensaio permitiram avaliar a qualidade do CCR como normal e ruim, com valores de kT entre 1,04E-15 e 3,29E-17m 2 . Este trabalho foi desenvolvido no âmbito do Programa de P&D ANEEL, projeto 6491-0301/2013. Palavras-chave:Concreto compactado com rolo, ataque por sulfato de origem interna, permeabilidade ao ar.Abstract: Aggressive agents are conducted to the interior of the concrete by fluid transport phenomena, through porosity under pressure conditions between the material and the external environment. Reactions with the chemicals products from the external environment or as byproducts of the reactions between concrete components, such as the attack of sulfate of internal origin, occur in the presence of pores water. The absorption by the concrete, depending on the porosity due to the interconnection of the capillary pores, mainly by the size of the pores. The permeability of the concrete is considered as a reference parameter for the analysis of the durability of concrete structures. A valid non-destructive method to evaluate the permeability of concrete is proposed by Torrent, to evaluate and classify the quality of the concrete. The objective of the present work was to evaluate the permeability, by Torrent method, of compacted roll (RCC) concrete samples with evidence of internal sulfate attack. The results obtained with this test method allowed to evaluate the CCR quality as normal and poor, with values of kT between 1.04E-15 and 3.29E-17 m 2 .

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“…vazios, denominada porosidade efetiva é um parâmetro fundamental para a permeabilidade dos materiais(SENTONE, 2011). Ainda têm influência, o tamanho dos poros e sua tortuosidade, ou seja, o tamanho médio efetivo do caminho de um fluido para atravessar um meio poroso(SCHEIDEGGER, 1974).…”

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Desenvolvimento de técnicas para caracterização de concreto seco utilizado na fabricação de peças de concreto para pavimentação intertravada.

Marchioni¹

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The dry concrete, also known as earth moist concrete or no-slump concrete, is most used to manufacture precast concrete products, as paving blocks, masonry blocks and concrete tubes, and also in rolled compacted concrete pavement. Its most important property is the low water content, and it requires mechanical equipment for its compactation. Paving blocks are normally manufactured using vibrocompression equipment, which at the same time applies both compaction and vibration resulting in paving blocks with high durability and mechanical resistance. Even though this technique is highly used it still lacks studies on some important steps of the manufacturing process. The mix design techniques are mostly empirical and don't deeply consider the aggregate characteristics, that are connected with its compacity and, by that, the characteristics of the paving block. Also, there are only a few studies of the rheology characteristics of dry concrete, which relates with de manufacturing process and the easiness that the mix is compacted. So, the object of this study is to develop a dry concrete characterization methodology that allows the systematic development of mix designs that are easily compacted and also improves the performance of the paving blocks.

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Desenvolvimento de método para medida de permeabilidade superficial de revestimentos de argamassa.

Abstract: Este exemplar foi revisado e alterado em relação a versão original, sob responsabilidade única do autor e com a anuência de seu orientador.

Cited by 5 publications

References 16 publications

Influence of Granulometry of the Small Aggregate on the Permeability of Wall Cement Coating

Influence of Granulometry of the Small Aggregate on the Permeability of Wall Cement Coating

Avaliação de testemunhos de concreto compactado com rolo, com indícios de ataque por sulfato de origem interna, pelo ensaio de permeabilidade ao ar - método Torrent

Desenvolvimento de técnicas para caracterização de concreto seco utilizado na fabricação de peças de concreto para pavimentação intertravada.

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