Thermal Treatment and Pozzolanic Activity of Calcined Clay and Shale

Irassar, Edgardo F.; Tironi, Alejandra; Bonavetti, Viviana L.; Trezza, Mónica Adriana; Castellano, Cristina C.; Rahhal, Viviana Fátima; Donza, Horacio A.; Scian, Alberto N.

doi:10.14359/51716717

Cited by 13 publications

(10 citation statements)

References 41 publications

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“…La primera procedente de Buenos Aires (I), la segunda de Neuquén (M), la tercera de Buenos Aires (CO) y la cuarta de Santa Cruz (CD). La arcilla I, constituida por un 47% de illita, se recolectó de las canteras activas de La Pampita en la región de Tandilia (-37°1'S, 60°16' O), cerca de Olavarría y Villa Cacique (Irassar et al, 2019). La explotación de la arcilla M, constituida por un 60% de montmorillonita, corresponde a la Formación Allen del grupo Malargüe (38ºS 68ºO) del Cretácico Superior (Lombardi et al, 2003).…”

Section: Arcillas Naturalesunclassified

“…Las cuatro arcillas fueron secadas en estufa de aire a 50ºC por 4h y se molieron hasta 100% pasante por tamiz ASTM #30 para su posterior uso. Humberto et al (2019) e Irassar et al (2019) estudiaron las temperaturas de calcinación que aseguran la deshidroxilación y formación de fase amorfa de cada mineral arcilloso, determinando que para illita es 950ºC (IC) y para montmorillonita y caolinita es 700ºC (MC, COC y CDC). Las arcillas que contienen montmorillonita y caolinita, fueron calcinadas a las temperaturas seleccionadas durante 30 min en mufla (Indef Modelo 272) a una velocidad de calentamiento de 13ºC/min y luego enfriadas en la mufla hasta 200ºC.…”

Section: Arcillas Naturalesunclassified

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Uso de arcillas argentinas naturales y calcinadas para la remoción de Cd(II) de soluciones acuosas

Portela,

Tironi,

Wagner

2023

RMLP

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Las arcillas se han utilizado ampliamente para remediación de aguas residuales contaminadas con metales pesados. El objetivo del presente trabajo es evaluar los cambios en la adsorción de Cd(II), cuando se utilizan arcillas naturales y calcinadas. Se seleccionaron cuatro muestras de arcillas procedentes de diferentes regiones de Argentina con mediano contenido de mineral arcilloso: illita (I), montmorillonita (M), caolinita con estructura ordenada (CO) y caolinita con estructura desordenada (CD). Se caracterizaron con Difracción de Rayos X, por Espectroscopia Infrarroja con Transformada de Fourier y superficie específica BET. Se llevaron adelante estudios de adsorción de Cd(II) con las mismas en su forma natural y calcinada, variando la concentración inicial del ión metálico. Se encontró que la arcilla natural con mediano contenido de montmorillonita y la arcilla calcinada con mediano contenido de illita (IC) presentaron los mayores porcentajes de adsorción (M 95%, IC 76%). Se concluye que el tratamiento térmico permite potenciar el uso de una arcilla (I) de la región de influencia de la Universidad Nacional del Centro de la Provincia de Buenos Aires (UNCPBA).

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Section: Arcillas Naturalesunclassified

Uso de arcillas argentinas naturales y calcinadas para la remoción de Cd(II) de soluciones acuosas

Portela,

Tironi,

Wagner

2023

RMLP

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“…The weak band at 3570 cm -1 present in halloysite may arise from H-bonding between surface OH-groups and interlayer water [92]. For illitic shale [97], the FTIR spectrum (Figure 8) shows the OH-stretching band at 3624 cm -1 accompanied by a strong absorption at 3423 cm -1 that is allocated to OH stretching vibrations of water molecules not released upon heating of the KBr pellet [94]. The Si-O stretching band is present at 1027 cm -1 , and a doublet in the 825-750 cm -1 range is assigned to the vibration of Si-O-Al moieties [98].…”

Section: Raw Clay Examplesmentioning

confidence: 99%

Paper of RILEM TC 282-CCL: mineralogical characterization methods for clay resources intended for use as supplementary cementitious material

Snellings

Reyes²,

Hanein

et al. 2022

Mater Struct

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To respond to the rapid introduction and development of calcined clays as supplementary cementitious material (SCM), the toolbox of characterization methods for cementitious materials requires extension to raw clay characterization. Borrowing concepts and methods developed in the field of clay mineralogy, this paper outlines the merits and limits of widely accessible characterization techniques for raw clays intended for use as SCM, when calcined. The paper focuses mainly on the identification and quantification of the raw clay mineral components, as these characteristics have important implications for further material processing and performance. General notes are provided on clay sampling and pre-treatment as well as bulk chemical analysis. The main techniques considered are X-ray diffraction, thermal analysis and infrared spectroscopy. Their application on raw clays is introduced, highlighting clay-specific aspects of sample preparation, data acquisition, and processing. Guidelines and interpretation tables are provided to aid in the analysis of the acquired data, while limitations and potential interferences are identified. Options for remote prospection by infrared spectroscopy are included as well. To illustrate the type of information to be gained and the complementarity of the techniques, two representative raw clays are fully characterised. This paper aims to highlight that mineralogical characterization is a feasible and often necessary step in the study and assessment of raw clays that can deliver a wealth of informative data if carried out appropriately.

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“…No segregation or bleeding was observed for the blended cements. In general, the use of pozzolans reduces the early strength of the matrix caused by the dilution effect (Bouchikhi et al 2019;Irassar et al 2019;Safhi et al 2020).…”

Section: Compressive Strength Developmentmentioning

confidence: 99%

“…analyses are valuable techniques used to determine the thermal transformation of minerals: dehydration, dehydroxylation, decarbonation, oxidation, decomposition, and phase transition or melting depending on their composition. However, this type of analysis cannot detect the structural change that occurs without mass loss, for example chlorite or illite collapse, which are studied by XRD and FT-IR analyses(Irassar et al 2019). The TGA-DSC analysis results are shown in Fig.1and Fig.2.…”

mentioning

confidence: 99%

Fluvial Sediments as SCMs: Characterization, Pozzolanic Performance, and Optimization of Equivalent Binder

Bouchikhi

Safhi

Rivard

et al. 2022

J. Mater. Civ. Eng.

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This paper presents an assessment of recycling thermally treated fluvial sediments as a supplementary cementitious material (SCM). Different calcination temperature was conducted ranging between 450 and 950 °C, and for each, a detailed characterization was carried out. Subsequently, different blended cements containing 25% calcined sediments (CS) were prepared and tested, including portlandite consumption, hydration kinetics, and compressive strength development (41 and 52 MPa at 7 and 90 days, respectively). The results show that blended cement based on CS at 750 °C provided the most favorable hydration kinetics, highest compressive strength among the other mixtures due to the highest portlandite consumption by pozzolanic reaction. An optimization design was tested to maximize the substitution rate of CS. The multivariable function results suggest a replacement rate up to 20% to produce a blended cement equivalent to that of CEM II 52.5 N, and up to 30% to produce a CEM II 42.5 N. The reported techno-environmental findings corroborate the use of CS as SCM and motivate future research on their effect on concrete properties.

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Thermal Treatment and Pozzolanic Activity of Calcined Clay and Shale

Cited by 13 publications

References 41 publications

Uso de arcillas argentinas naturales y calcinadas para la remoción de Cd(II) de soluciones acuosas

Uso de arcillas argentinas naturales y calcinadas para la remoción de Cd(II) de soluciones acuosas

Paper of RILEM TC 282-CCL: mineralogical characterization methods for clay resources intended for use as supplementary cementitious material

Fluvial Sediments as SCMs: Characterization, Pozzolanic Performance, and Optimization of Equivalent Binder

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