Plastic behaviour of different ceramic pastes processed by extrusion

Ribeiro, M.J.; Ferreira, J.M.F.; Labrincha, J.A.

doi:10.1016/j.ceramint.2004.06.016

Cited by 48 publications

(43 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The shape of the curves as well as the range of measured values is comparable to those obtained by Baran et al 8 and Ribeiro et al 5 , although no fitting model was applied in those cases.…”

Section: Compression Tests Resultssupporting

confidence: 74%

“…However, the plasticity determination is not always an easy task since it cannot be immediately applied and interpreted. In fact, there are several methods for measurement and characterization of the plasticity of a clay body, although its experimental determination, in some cases, is operator-dependent, causing difficulties in interpreting the results 5 . Among the methods, the Atterberg's plasticity index, the Pfefferkorn's plasticity index, stress/strain curves, indentation and rheological measurements are the most applied.…”

Section: Introductionmentioning

confidence: 99%

“…Baran et al 8 formulated their workability concept for clays using compression tests in cylindrical samples, allowing to determine the optimum amount of moisture for each clay studied. Ribeiro et al 5 evaluated the plasticity of extrudable clays by compression tests and found that the measured samples were ruptured at 50-55% deformation. In a typical test curve, a great deal of information is obtained: modulus of elasticity, yield strength, maximum deformation and rupture strength.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Measuring and Modeling the Plasticity of Clays

2010

View full text Add to dashboard Cite

The measurement of plasticity in clay bodies is crucial in order to get products free of defects and with less processing time. However, tests which simulate the behavior of the clay during processing and the mathematical modeling of some of its characteristics, particularly the plasticity, become difficult because many variables are involved and there is no consensus on the choice of method to be used. This study aimed to develop a mathematical model based on compression test to evaluate the plasticity of clays. Three types of clays were studied with different levels of moisture and their indices of plasticity were also characterized by the Atterberg's and Pfefferkorn's methods. The experimental data were well fitted by the theoretical curves for a wide range of clay plasticity. Moreover, it was possible to observe a correlation between effective stress of compression and paste moisture within each group of clay.

show abstract

Section: Compression Tests Resultssupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Measuring and Modeling the Plasticity of Clays

2010

View full text Add to dashboard Cite

show abstract

“…3), probably owing to the low clay fraction content. The presence of clay minerals, in fact, makes possible for particles to slide over each other due to the water retained in the interstitial spaces, thus favouring the extrusion [24]. Alkali-silica reactivity was investigated in compliance with accelerated test proposed by [14].…”

Section: Physical Requirementsmentioning

confidence: 99%

Technical and environmental characterisation of recycled aggregate for reuse in bricks

et al. 2017

View full text Add to dashboard Cite

Abstract. Waste mud coming from an aggregate washing plant was formerly used as filling material for a pond, aimed at the recovery of an abandoned quarry. Once completed the filling capacity of the pond, the need for identifying a possible reuse of mud produced by the plant arose in order to avoid landfill disposal. Therefore, mud has been geometrically, physically and chemically characterised for its recovery as construction material. A variety of tests was carried out on mud samples as required by EN technical specifications and by Italian environmental standards, focusing particularly on leaching behaviour. The tested material showed satisfactory physical and chemical properties and a release of pollutants below the limits set by the Italian code. Many mix-designs for the production of unfired bricks made of waste mud, sand and straw, stabilised and non-stabilised with lime, gypsum or cement, were developed. The bricks were tested in order to evaluate mechanical properties and leaching behaviour. Mud bricks provided remarkable compressive strength, even if not suitable for structural elements. The use as interior design to minimise humidity changes and to facilitate a thermal insulation is fostered, thus strengthening the so-called green building economy.

show abstract

“…Nesta etapa ocorre a eliminação parcial da água de extrusão, que geralmente é superior a 20% em massa, resultando em significativas retrações e gerando tensões que podem ocasionar defeitos [3,4]. Por este motivo, normalmente a secagem é uma das etapas mais lentas do processo.…”

Section: Introductionunclassified

Efeito de Aditivo Defloculante no Processamento de Massa para a Obtenção de Blocos Cerâmicos Estruturais

Fabris¹,

Silva²,

Rodrigues³

et al. 2017

Cerind

View full text Add to dashboard Cite

ResumoOs processos de fabricação de cerâmica vermelha são baseados principalmente na extrusão de uma massa plástica, normalmente composta por argilas e materiais não plásticos para melhorar o processamento. A utilização de aditivos é uma alternativa para facilitar o fluxo da massa durante o processo de extrusão, proporcionando a melhoria das propriedades mecânicas e/ou a redução do ciclo de secagem. Neste trabalho estudou-se o efeito de um aditivo para a secagem disponível comercialmente, composto de silicato de sódio e TPF, que são defloculantes, e carbonato de cálcio. O material foi caracterizado por fluorescência de raios X e difração de raios X. Foi empregada a dosagem de 3% de aditivo, conforme recomendação do fabricante, em massa utilizada para a fabricação de tijolos, sendo analisada a influência deste sobre a plasticidade da massa pelo método de Casagrande e sua influência sobre a secagem através da curva de secagem e curva de Bigot. Os corpos-deprova foram caracterizados antes da queima por meio da determinação da densidade aparente e da resistência à flexão, e após a queima por meio da determinação da densidade aparente, da resistência à flexão e da absorção de água. O estudo da plasticidade da massa pelo método de Casagrande mostrou alterações no limite líquido das amostras, havendo uma redução deste de 37,3 para 33,6%, enquanto a umidade de extrusão foi reduzida de 26,2 para 22,8%. Houve ainda um aumento na resistência mecânica a seco de 6,6 para 10,1 MPa. Os corpos de prova da massa com aditivo sinterizados a 890 °C apresentaram valores de resistência à flexão semelhantes aos valores dos corpos de prova da massa padrão sinterizados a 920 ºC, respectivamente 12,7 e 12,3 MPa.Palavras-chave: cerâmica estrutural, secagem, aditivos.

show abstract

Plastic behaviour of different ceramic pastes processed by extrusion

Cited by 48 publications

References 5 publications

Measuring and Modeling the Plasticity of Clays

Measuring and Modeling the Plasticity of Clays

Technical and environmental characterisation of recycled aggregate for reuse in bricks

Efeito de Aditivo Defloculante no Processamento de Massa para a Obtenção de Blocos Cerâmicos Estruturais

Contact Info

Product

Resources

About