Influence of microstructural and morphological properties of raw natural clays on the reactivity of clay brick wastes in a cementitious blend matrix

Schackow, Adilson; Correia, Sivaldo Leite; Effting, Carmeane

doi:10.1590/0366-69132020663782852

Cited by 10 publications

(5 citation statements)

References 28 publications

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“…The ICP results indicate that all clays were composed mainly of silica and aluminum oxide. The Chingola and Mporokoso white clays had molar ratios of SiO2/Al2O3 of 3.8 and 2.4, respectively, which were more than the kaolinite's predicted molar ratio of 2.00 [9]. Molar ratios that are larger than the theoretical value point to the existence of quartz and other silicates in the samples [10].…”

Section: Inductively Coupled Plasma (Icp)mentioning

confidence: 77%

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Modification and characterization of selected Zambian clays for potential use as photocatalysts

Mambwe,

Kalebaila,

Johnson

et al. 2023

Eur J Chem

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Natural materials such as clay are valued for their favorable physical and chemical characteristics on the surface. In this study, the selected Zambian clay materials are immobilized with TiO2 and manganese ions to determine their suitability for use as photocatalysts. SiO2 and Al2O3 oxide composition of Zambian clays was obtained in the range of 35.08-52.63/35.15-52.72 and 13.85-21.73/13.77-21.80, respectively, by inductively coupled plasma (ICP) and X-ray fluorescence (XRF); while Energy dispersive spectroscopy (EDS) of modified clays showed that they have 1.54% incorporation of Ti and 4.98% Mn for Chingola clay to act as UV-Vis absorbers. According to the powder X-ray diffraction analysis of raw clays, the primary phase of all samples is quartz and contains low concentrations of bentonite and kaolinite. The scanning electron microscope (SEM) showed fluffy morphology with agglomeration, while the particle sizes of the clay photocatalysts with the use of transmission electron microscopy (TEM) ranged between 3.0 and 4.8 nm. UV-vis spectroscopy of the samples showed bandgap energies ranging from 2.52-3.08 eV. The surface areas, pore volumes, and pore sizes of the investigated modified and unmodified clays determined by the Brunauer, Teller, Emmett/Barrett Joyner Halenda (BET/BJH) model ranged from 12.06-64.51 m2/g, 0.029-0.068 cm3/g, and 0.642-2.802 nm, respectively. To enhance the mixing of oil and clay, the adsorbents were grafted with silane and confirmed by Fourier transform infrared (FTIR) spectroscopy through CH peaks at ~1450 and ~2860 cm-1. The modified clay materials exhibited favorable properties for use as photocatalysts.

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Section: Inductively Coupled Plasma (Icp)mentioning

confidence: 77%

“…The amount of impurities (quartz, hematite, etc.) in the clay sample affects the particle morphology [9]. Table 4 presents the EDS data for unmodified and modified clays.…”

Section: Scanning Electron Microscopy/energy Dispersive Spectroscopy ...mentioning

confidence: 99%

Modification and characterization of selected Zambian clays for potential use as photocatalysts

Mambwe,

Kalebaila,

Johnson

et al. 2023

Eur J Chem

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“…This corresponded to a mass loss of 5.94%, 1.6% and 3.12% for A1, A2 and A3, respectively (TGA curves). At 550 • C, a small endothermic peak without an associated mass loss was observed in A2, possibly related to the allotropic transformation of quartz (α-quartz to β-quartz) [46,47]. In clay ceramic manufacturing, this inversion can lead to cracks if cooling occurs abruptly [30].…”

Section: Raw Materials Characterizationmentioning

confidence: 99%

Sustainable Mining: Reuse of Clay from Abandoned Areas in the South of Brazil for Ceramic Production Based on a Simplex Design

Saviatto,

Zaccaron,

Nandi

et al. 2023

Materials

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The environmental impact of clay mining can be minimized using extractive mineral circularity practices. Combining the available knowledge of the characteristics of different clays with statistical tools was a decisive step for the improved use of mining resources. Through blends, all the mined materials can be incorporated to produce quality ceramic products. This study identified two types of clay from abandoned mining areas in the southern state of Santa Catarina, Brazil. These raw materials were valued together with plastic clay, which is widely used in the region, to develop 10 different formulations using a mixture design method. The clays were characterized using average granulometric distribution, mineralogical composition, and chemical, thermal and plasticity analyses. The specimens were shaped by extrusion, dried in an oven, fired in a muffle furnace and characterized based on their shrinkage, water absorption and compressive strength values. Two clays with varying characteristics—one with low workability and the other with a high silica content—exhibited difficulties (generating defects) in the extrusion shaping process, which compromised the final quality of the ceramic paste. Results showed that incorporating up to 45% by mass of the low-workability clay resulted in an increase in water absorption. The more siliceous clay improved dimensional control; however, its use at high contents (~80%) decreased the mechanical resistance. Nevertheless, when used in controlled amounts, these clays can be beneficial to the production of blocks and bricks because they have the potential to improve some properties of the finished ceramic products.

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“…A utilização de RCV como adição mineral pozolânica já foi bastante estudada (GARCIA et al, 2014;MATIAS;FARIA;TORRES, 2014;IRKI et al, 2017;ZHAO et al, 2020;SCHACKOW;CORREIA;EFFTING, 2020). Atualmente esforços estão sendo realizados para ampliação do conhecimento acerca da potencialidade de uso, após ativação térmica, de argilas contendo baixos teores de caulinita como MCS.…”

Section: Referencial Teóricounclassified

Comparação da reatividade de resíduo de cerâmica vermelha cominuído e matéria-prima de olaria calcinada

Pereira,

Rêgo,

Hoppe Filho

2023

Ambient. constr.

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Resumo A potencialidade do uso de argila calcinada como material cimentício suplementar (MCS) decorre da disponibilidade global de matérias-primas argilosas. A calcinação desidroxila a caulinita e forma uma matriz amorfa reativa. O teor de caulinita nas matérias-primas é um pré-indicador da possível reatividade pós calcinação. Na indústria de cerâmica vermelha, a matéria-prima é composta predominantemente de argilominerais e quartzo. Os produtos sinterizados descartados nesse setor, denominados resíduo de cerâmica vermelha (RCV), apresentam, após cominuição, capacidade de reagir com cal a depender do teor de caulinita contido na matéria-prima e de suas características físico-químicas e mineralógicas. Neste trabalho foi realizada a comparação da reatividade de duas amostras de argilas calcinadas provenientes de matérias-primas de diferentes polos ceramistas, com distintos teores de caulinita, com os respectivos RCVs. Os ensaios dereatividade foram: Chapelle modificado, Frattini,teste R³ eíndice de desempenho (ID), com variação do tipo de cimento Portland. A reatividade foi dependente do teor de caulinita contido na matéria-prima e da área superficial específica BET do material calcinado cominuído. A análise dos resultados indicou pouca influência do tratamento térmico na reatividade dos materiais calcinados.

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Influence of microstructural and morphological properties of raw natural clays on the reactivity of clay brick wastes in a cementitious blend matrix

Cited by 10 publications

References 28 publications

Modification and characterization of selected Zambian clays for potential use as photocatalysts

Modification and characterization of selected Zambian clays for potential use as photocatalysts

Sustainable Mining: Reuse of Clay from Abandoned Areas in the South of Brazil for Ceramic Production Based on a Simplex Design

Comparação da reatividade de resíduo de cerâmica vermelha cominuído e matéria-prima de olaria calcinada

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