Influência do procedimento de mistura em laboratório nas propriedades de argamassas

França, Marylinda Santos de; Cardoso, F. A.; Pileggi, Rafael Giuliano

doi:10.1590/s1678-86212013000200009

Cited by 7 publications

(7 citation statements)

References 6 publications

(5 reference statements)

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“…Correlating the results of the concrete slump test with addition of fresh residue obtained by Soares [36] and the yield stress of cement pastes obtained in present study, Table 10 and Figure 10 were established. It is important to mention here that the correlation is done using the results of slump tests obtained by Soares [36] for concrete in the fresh state while the present study shows values of yield stress of the cement phase of these concretes, ie, only water mixed with cement and OSR residue, using the same type of cement and w/c ratio for the two studies.…”

Section: Correlation Between Rheological Parameters Of the Cement Pasmentioning

confidence: 56%

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Contribution to the rheological study of cementitious pastes with addition of residues from the processing of ornamental rocks

Sato

Teixeira

2018

Rev. IBRACON Estrut. Mater.

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Brazil is one of the world's largest producers and exporters in the field of ornamental stones. On the other hand, the production and processing of ornamental stones result in a large volume of unused material in the form of sludge, usually discarded inappropriately in sedimentation ponds or landfills. Several researches have been carried out aiming the reuse of this material in cementitious matrixes. In the field of rheology, there are still incipient national studies that use the rheological parameters obtained experimentally to determine the behavior of cement matrix based on Portland cement. Thus, the objective of this work is to characterize rheologically the behavior of cementitious pastes with and without addition of ornamental rock processing residue (RBRO) in its natural condition. Cement pastes were prepared with three a/c ratios (0.45, 0.55, 0.65) and four residue addition contents (0%, 5%, 10%, 15%) and submitted to the flow test. In tests for characterization of the residue, the RBRO presented as a material of specific fineness and mass near the cement, having low reactive activity, indicating that the residue can be used as an inert mineral addition in the cementitious matrix. In the rheological characterization tests of the pulps studied, it was observed in the flow tests that the samples behaved as a non-Newtonian, pseudoplastic and thixotropic fluid.

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Section: Correlation Between Rheological Parameters Of the Cement Pasmentioning

confidence: 56%

“…According to some researchers, the mixing time is one of the factors that influence the paste homogenization. França et al [36,37] have shown in their research that samples with longer mixing times demonstrate more efficiency, producing more fluid and stable mortars.…”

Section: Determination Of the Mixing Procedures For The Production Of mentioning

confidence: 98%

Contribution to the rheological study of cementitious pastes with addition of residues from the processing of ornamental rocks

Sato

Teixeira

2018

Rev. IBRACON Estrut. Mater.

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“…Os teores de 40% e 60% apresentaram comportamento bem parecido, com grande parte da deformação plástica e atingindo em seguida o enrijecimento por deformação. A ocorrência do estágio II está relacionada ao comportamento de argamassas de fácil aplicação e espalhamento [15]. A curva do teor de 80% também apresentou dificuldade de escoamento, logo atingindo o enrijecimento por deformação, ou seja, pouca trabalhabilidade e enrijecimento brusco, sendo impossível a sua aplicação [16].…”

Section: Resultsunclassified

Efeito Da Adição De Resíduo De Granito Na Reologia Da Argamassa

Barroso¹,

Zanelato²,

Azevedo³

et al. 2019

ABM Proceedings

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Resumo A construção civil é um dos maiores consumidores de recursos naturais. Por isso, vem sendo estudado a adição de materiais alternativos para a produção de argamassas, como a incorporação de resíduo da produção de granito na substituição parcial ou total do agregado. Este trabalho tem como objetivo analisar a viabilização do granito em argamassa e realizar o ensaio de reologia a fim de analisar a viscosidade e o escoamento da argamassa. Para isso foi estabelecido à incorporação de granito em 0%, 20%, 40%, 60%, 80% e 100%. Assim, no estado fresco, foram realizados ensaios de índice de consistência, conforme NBR 13276/2005 e ensaio de análise reológica através do squeeze-flow, consoante NBR 15839/2010. O squeeze-flow é um método que avalia o comportamento da argamassa em relação à carga aplicada e a deformação ocasionada. Os resultados mostram que as argamassas com teores de 0% e 20% apresentaram dificuldade de escoamento, enquanto o teor de 80% foi necessário uma redução de carga para a deformação elástica. Já a amostra de 100% apresentou deformação por enrijecimento e os teores de 40% e 60% apresentaram maior deformação plástica e melhor desempenho, concluindo-se, então,a viabilizaçãoda utilização de granito em argamassas. Palavras-chave:Argamassa; Granito; Reologia

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“…Immediately after mixing, the mortars are subjected to a rotational shear cycle with the same rheometer setup used for mixing (impeller geometry and planetary configuration). the shear cycle, as well as, the hysteresis area (the difference between acceleration and deceleration curves) that regards the stability condition of the material, therefore, also indicating the mixing efficiency provided by the procedure applied [27].…”

Section: Rheological Evaluationmentioning

confidence: 99%

Influence of the addition sequence of PVA-fibers and water on mixing and rheological behavior of mortars

França

Cardoso

Pileggi

2016

Rev. IBRACON Estrut. Mater.

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The mixing process of fiber-containing cementitious suspensions is a crucial factor to obtaining a good dispersion of fibers and guarantee adequate mechanical performance of the hardened products. The addition of fibers into the suspension causes reduction of the fluidity of the system due to factors inherent to the fibers, the matrix and their interaction. During mixing, these interactions make dispersion and homogenization processes more difficult due to the formation of fibers - particles agglomerates. Conventional techniques to assess workability of mortars are inadequate to evaluate the rheological behavior of fiber-reinforced systems, in which parameters like viscosity and yield stress are not completely taken into account. Therefore, this work employs rotational rheometry to evaluate the influence of fiber and water addition sequences on mixing and rheological behavior of mortars containing Polyvinyl Alcohol (PVA) fibers. Constant test parameters were: mixing time of 317s; impeller velocity 126.5 rpm; water flow 128g/s. A constant mix design was used with a water content of 16%wt, and a 0.2%vol of fibers were added to the reference composition. Four mixing sequences were studied: S1 and S2 are based on the addition of fibers at different stages of the mixing process; while in S3 and S4 not only the fibers are added at different stages, but also the water addition is performed in two steps (25% first and 75% latter).Results showed that it is possible to optimize the mixing step of fiber-containing systems by changing the moment of fiber addition into the mixture. The introduction of fibers after mixing the dry mortar with water, when it already had achieved its fluidity point, demanded a lower mixing effort and produced a more flowable material.

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Influência do procedimento de mistura em laboratório nas propriedades de argamassas

Cited by 7 publications

References 6 publications

Contribution to the rheological study of cementitious pastes with addition of residues from the processing of ornamental rocks

Contribution to the rheological study of cementitious pastes with addition of residues from the processing of ornamental rocks

Efeito Da Adição De Resíduo De Granito Na Reologia Da Argamassa

Influence of the addition sequence of PVA-fibers and water on mixing and rheological behavior of mortars

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