Measuring and Modeling the Plasticity of Clays

Andrade, Fernando Augusto; Al-Qureshi, H. A.; Hotza, Dachamir

doi:10.1590/s1516-14392010000300019

Cited by 26 publications

(20 citation statements)

References 7 publications

(8 reference statements)

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“…The dried unfired sludge was blended in different proportions (up to 35% by weight) with the basic mixture powder in a laboratory horizontal tumbler for two hours. The plasticity of the different blends was determined using the Pfefferkorn method [12].…”

Section: Samples Preparationmentioning

confidence: 99%

The use of sewage sludge in the production of ceramic floor tiles

et al. 2018

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Scientists proved that municipal sewage sludge contains many dangerous pathogens, toxic heavy metals, endocrine disruptors, drains, storm water runoff, hospitals, and industrial plants. Sewage sludge represents an extremely high ecological hazard to the environment. Due to the increasing amount of sludge generated from the wastewater treatments plants a strong demand for environmentally and effective safe reuse has arisen. One potential use of that waste is its incorporation in the production of ceramic tiles. The main aim of present work was to study the possibility of usage of this hazardous waste in floor ceramic tiles industry. A dried sludge waste was added in percentages from 5% up to 35% to a standard floor tile mix, molded, pressed uniaxially at 30 MPa and then fired at temperatures reaching 1150°C for 15 min soaking time. The properties of both green and fired tiles were investigated as function of percent waste added. The vitrification parameters, which are linear firing shrinkage, water absorption, apparent porosity, and mechanical property, were determined and compared with ISO standards. Fired samples of the proposed mixtures were investigated by scanning electron microscope (SEM). It was possible to obtain tiles that abided by ISO standards for maximum addition of 7% sludge fired at 1150°C (for water absorption < 10%), and 10% sludge or 5% sludge for tiles fired at 1150°C and 1100°C, respectively (for water absorption > 10%), which are recommended for both their economic and environmental benefits.

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Section: Samples Preparationmentioning

confidence: 99%

The use of sewage sludge in the production of ceramic floor tiles

et al. 2018

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“…Os valores de índice de plasticidade aumentam juntamente com o aumento do teor de argila (ф < 2 μm), produzindo alta plasticidade para as amostras de depósito "A". Assim, a fração do tamanho das partículas (ф < 2 μm) pode afetar os limites de Atterberg ( [5,18,19]). Os valores típicos do índice de plasticidade de Atterberg para argila caulinítica variam de 5% a 22%, para argila ilita de 39% a 51%, e para argilas montmorilonita, até 600% [20].…”

Section: Resultsunclassified

Avaliação da potencialidade de argilas da formação geológica Calumbi e Riachuelo em Sergipe para aplicação em revestimento cerâmico

et al. 2014

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INTRODUÇÃOAs argilas são os materiais mais importantes do ponto de vista tecnológico para fabricação de materiais cerâmicos [1]. O comportamento das argilas utilizadas na fabricação de materiais cerâmicos é fortemente dependente da sua composição química e mineralógica que influenciam suas propriedades físicas e químicas, cujas propriedades são essenciais aos produtos acabados de cerâmica [1,2].As formulações típicas de placas cerâmicas para revestimento consistem principalmente de componentes como caulim ou caulinita, feldspatos e quartzo que, em proporções adequadas, contribuem individualmente no processo tecnológico e desempenho dos produtos finais. A presença da argila confere a plasticidade, os feldspatos atuam como agente fundente e o quartzo como material de enchimento [3,4]. Frações granulométricas (geralmente < 2 mm) ajudam a formação de plasticidade, que é um parâmetro necessário para a boa propriedade de moldagem de produção da cerâmica [5,6]. No processo de fabricação de placas cerâmicas, as matérias-primas são produzidas através de tecnologia de pó, seguidos normalmente por prensagem e queima [7,8]. Durante a etapa de queima, em temperaturas elevadas, uma série de transformações ocorre por interações entre os três componentes básicos (argila / feldspato / quartzo). As novas fases formadas são decisivas para as propriedades finais dos produtos cerâmicos [7,9]. Segundo a Associação Nacional ResumoAs argilas são os materiais mais importantes do ponto de vista tecnológico para fabricação de materiais cerâmicos. A sua composição química e mineralógica influencia fortemente as propriedades físicas e químicas que se deseja obter no produto acabado de cerâmica. O objetivo desse trabalho foi avaliar a potencialidade de argilas da formação geológica Calumbi e Riachuelo do estado de Sergipe para aplicação em revestimento cerâmico. Foram coletadas amostras de 3 depósitos argilosos (A, B e C) e caracterizadas por ensaios de granulometria, plasticidade, difração de raios X, análises termogravimétrica e diferencial, infravermelho e fluorescência de raios X. As principais fases identificadas foram quartzo, caulinita, ilita, calcita e feldspatos, sendo que os depósitos B e C apresentaram elevados teores de calcita. Constatou-se que para as condições do processamento cerâmico adotadas as argilas dos depósitos A e B devidamente misturadas são adequadas para serem utilizadas na indústria de processamento de pisos cerâmicos, em especial para a obtenção da classificação do grupo cerâmico BIII. Palavras-chave: argilas, caracterização, revestimento cerâmico, grupo de absorção. ("A", "B" and "C") and characterized by granulometryassays, plasticity, X-ray diffraction, and differential thermogravimetric analysis, infrared and X-ray fluorescence. The main identified phases were: quartz, kaolinite, illite, calcite and feldspar, and deposits "B" and "C" showed high levels of calcite. It was found that for ceramic processing conditions adopted in this paper, the properly mixed clay deposits of "A" and "B" are suitable for use ...

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“…The coefficient of friction is assumed to be constant because of the difficulty in its determination and it poses no significant threat in the analysis. 2 The pictorial setup and deformation step is shown in Figure 1. Standard test methods D 4318 27 were used to determine the Atterberg limits.…”

Section: Experimental Methodsmentioning

confidence: 99%

Plasticity characterization of certain Nigeria clay minerals for their application in ceramic water filters

et al. 2021

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Plasticity is an essential property of clay that determines its suitability for water filtration. There are no published works on the plastic behavior of clays from the study locations. The plastic behavior of seven Nigerian clays was examined using plasticity indices and compressive stress parameters in relation to chemical compositions and moisture content. The objective is to determine plastic behavior of some Nigerian clays and their suitability in production of Expanded Clay Aggregates (ECA) for water filters. Compressive stresses and deformation parameters were determined experimentally and compared theoretically. Atterberg limits (D 4318) were used to determine the plasticity indices. Chemical compositions of the samples were examined with XRF and correlated with plasticity and mineral contents of the clays. The clays are aluminosilicates with SiO2/Al2O3 ratio of 1.61 to 3.03 and plastic indices of 8 to 49. Low plastic indices (8–11) and low compressive stresses parameters were observed for kaolinite clays (0.002 MPa) due to their low affinity for water while zeolite rich clays showed high plastic indices (46 and 49) for Obowo and Minna and sharp difference in their compressive stresses parameters (0.15 and 0.03 MPa) at optimum moisture contents of 57% and 53%, respectively. Despite varying moisture content, chemical and mineral compositions, all curves showed similar trends apart from kaolinites at 40% moisture content. Relationships exist among microstructural properties, chemical composition, moisture content, compressive strength, and plasticity indices of the clays. The plastic behaviors show they are suitable for development of ECA for water filters.

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Measuring and Modeling the Plasticity of Clays

Cited by 26 publications

References 7 publications

The use of sewage sludge in the production of ceramic floor tiles

The use of sewage sludge in the production of ceramic floor tiles

Avaliação da potencialidade de argilas da formação geológica Calumbi e Riachuelo em Sergipe para aplicação em revestimento cerâmico

Plasticity characterization of certain Nigeria clay minerals for their application in ceramic water filters

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