Influence of calcined coal-series kaolin fineness on properties of cement paste and mortar

Liu, Yuanyuan; Lei, Shaomin; Lin, Min; Xia, Zhangjie; Pei, Zhenyu; Li, Bo

doi:10.1016/j.conbuildmat.2018.03.117

Cited by 31 publications

(8 citation statements)

References 23 publications

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“…It can be construed that the transformations experienced by the samples during the grinding and calcination process significantly influence their pozzolanic and hydraulic properties, aspects that are adequately consolidated when compared with those established by Zhang and Ling [ 31 ], Zhou et al [ 32 ], Florez et al [ 33 ], Liu et al [ 34 ] and Jaskulski et al [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

Ignimbrites Related to Neogene Volcanism in the Southeast of the Iberian Peninsula: An Experimental Study to Establish Their Pozzolanic Character

et al. 2023

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The speed at which climate change is happening is leading to a demand for new pozzolanic materials that improve the quality of cements and, at the same time, limit the emission of greenhouse gases into the atmosphere. The main objective of this work is the detailed characterization of an ignimbrite sample (IGNS) to demonstrate its effectiveness as a natural pozzolan. To meet this objective, a series of tests were carried out. In the first stage, mineral and chemical analyses were performed, such as petrographic analysis by thin section (TSP), X-ray diffraction (XRD), oriented aggregate (OA), scanning electron microscopy (SEM) and X-ray fluorescence (XRF). In the second stage, the following technical tests were carried out: chemical quality analysis (QCA), pozzolanicity test (PT) and mechanical compressive strength (MS) at 7, 28 and 90 days, using mortar specimens with ignimbrite/cement formulation (IGNS/PC): 10, 25 and 40% to establish the pozzolanic nature of the ignimbrite. The results of the mineral and chemical analyses showed that the sample has a complex mineralogical constitution, consisting of biotite mica, potassium feldspar, plagioclase, smectite (montmorillonite), quartz, volcanic glass, iron, titanium and manganese oxides, chlorite and chlorapatite. On the other hand, the technological tests revealed the pozzolanic nature of the sample, as well as visible increases in the mechanical compressive strengths in the three proportions, the most effective being IGNS/PC:10% and IGNS/PC:25% at 7, 28 and 90 days of setting. The results obtained could be applied in the formulation of new pozzolanic cements with ignimbrite as a natural pozzolanic aggregate.

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Section: Resultsmentioning

confidence: 99%

Ignimbrites Related to Neogene Volcanism in the Southeast of the Iberian Peninsula: An Experimental Study to Establish Their Pozzolanic Character

et al. 2023

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“…This can be explained by the fact that the residual concentrations of OH − and Ca 2+ ions decrease with the cement hydration and pozzolanic reaction of the additions. This reflects the pozzolanic reactivity of the clays, which consume these ions as they are produced [37,38]. At 7 days, only clay A1 is below the solubility curve, showing that this sample had a high reactivity kinetics compared to the other clays.…”

Section: Frattini Testmentioning

confidence: 90%

Microstructural Analysis of the Reactivity Parameters of Calcined Clays

et al. 2022

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Four (04) different types of clays from Burkina Faso were studied for their potential applications in the production of calcined clays as substitution materials for Portland cement. The study aimed at analyzing the factors affecting their reactivity. The untreated clays were subjected to various tests to highlight the intrinsic properties that can influence their reactivity. After the treatment by calcination, the clays were subjected to various pozzolanicity tests and microstructural analysis in order to evaluate their influence on the microstructure of the cement paste. The results showed that the reactivity of calcined clays is strongly related to the intrinsic properties of the raw clays, such as the content and the structure of kaolinite: disordered kaolinite reacts better than ordered kaolinite. After the calcination, the reactivity depends on the amorphous phase (amorphous content) of the clays, which influences the strength activity index. This study established a correlation between different parameters to easily identify the main properties of calcined clays that can influence their pozzolanic reactivity. All the results showed that the kaolinite content is a determining factor in the reactivity of clays before calcination. However, the study showed that the amorphous content of kaolinite is the determining parameter of the reactivity of calcined clays, as calcination can lead to the recrystallization of kaolinite.

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“…La actividad puzolánica del CWP también se evaluó por la prueba de Frattini. La Figura 5 muestra la ubicación del CWP, que se localizó por encima de la isoterma de solubilidad, lo que indicó que el Ca 2+ y OHliberado en la hidratación del cemento Portland no se consumió efectivamente, como es lo normal en una reacción puzolanica (Liu et al, 2018), por lo que se evidenció que el CWP ensayado no tiene capacidad de generar reacciones puzolánica a ninguna de las 2 edades evaluadas (7 y 28 días).…”

Section: Método Químico (Frattini)unclassified

Propiedades Físico-Mecánicas De Concretos Autocompactantes Producidos Con Polvo De Residuo De Concreto

Pastrana-Ayala¹,

Silva-Urrego²,

Adrada-Molano³

et al. 2019

Inf.Tec

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La gran demanda de Cemento Portland Ordinario (CPO) debido al incremento de nuevas obras civiles y la generación de Residuos de Construcción y Demolición (RCD) causan un impacto ambiental negativo, por lo que una solución a esta problemática es el reciclaje de estos materiales para la producción de nuevos concretos. El reemplazo parcial de CPO por polvo de residuo de concreto (Concrete Waste Powder, CWP), proveniente del proceso de reciclaje de concreto, ha sido un enfoque sostenible. En esta investigación ser realizó la caracterización química y puzolánica del CWP mediante Fluorescencia de Rayos X (FRX), la prueba Frattini e índice de actividad de resistencia. Además, se evaluó la factibilidad de producir Concretos Autocompactantes (CAC) elaborados con CWP. El comportamiento de los CAC preparado con varias relaciones de reemplazo de CWP por CPO (en 0, 10, 20 y 30 %) proveniente de RCD, se evaluaron experimentalmente. Las propiedades de trabajabilidad se determinaron mediante las pruebas de flujo de asentamiento, embudo en V y caja en L. Las propiedades en estado endurecido de los CAC estudiadas incluyeron la resistencia a la compresión, la resistencia a la tracción indirecta, la resistencia a la flexión, la porosidad y la succión capilar. Los resultados experimentales de este trabajo mostraron que el CWP puede ser empleado con éxito como relleno en concretos autocompactantes, a pesar de disminuir la trabajabilidad y la resistencia mecánica. Palabras clave: concreto autocompactante; residuos de demolición y construcción; polvo de residuo de concreto; cemento Portland; trabajabilidad; propiedades mecánicas.

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Influence of calcined coal-series kaolin fineness on properties of cement paste and mortar

Cited by 31 publications

References 23 publications

Ignimbrites Related to Neogene Volcanism in the Southeast of the Iberian Peninsula: An Experimental Study to Establish Their Pozzolanic Character

Ignimbrites Related to Neogene Volcanism in the Southeast of the Iberian Peninsula: An Experimental Study to Establish Their Pozzolanic Character

Microstructural Analysis of the Reactivity Parameters of Calcined Clays

Propiedades Físico-Mecánicas De Concretos Autocompactantes Producidos Con Polvo De Residuo De Concreto

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