Activation temperature-mediated mineralogical transformations in slate quarry sludge: Pozzolanic properties

Bosque, I.F. Sáez del; Frías, Moisés; Rojas, M.I. Sánchez de; Medina, César

doi:10.1016/j.conbuildmat.2018.07.238

Cited by 16 publications

(5 citation statements)

References 58 publications

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“…The energy consumption (E) and energy performance (E fc ) versus replacement ratio graphs in Figure 9 show that including granite sludge induced a decline in energy consumption proportional to the percentage of GS. Hamidi et al [35] observed the same pattern for andesite additioned to cement at rates of 10 % to 40 % and Saéz del Bosque et al [61] in cements containing 10 % or 20 % slate sludge.…”

Section: Energy Performancementioning

confidence: 70%

Energy performance and calorimetric behaviour of cements bearing granite sludge

et al. 2019

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Blending supplementary cementitious materials with portland cement is one of the current strategies for producing more eco-efficient binders by lowering the energy consumption and CO 2 emissions intrinsic to OPC manufacture. The effect of such additions on heat of hydration and energy performance is a subject of particular interest, for higher heat may reduce the service life of a concrete structure, whilst energy consumption per tonne of binder or megapascal may prove not to be energy-efficient. This paper explores the energy performance of granite sludge (GS) as an active addition to clinker and the effect of this by-product on heat of hydration and eco-efficiency. The findings show that maximum heating and total heat released are lower in the additioned than in the conventional material, with the difference widening at higher replacement ratios. Optimal energy performance is observed at ratios of 15 % to 30 % (both inclusive), with the experimental materials requiring less energy than ordinary cement per megapascal (MPa) of strength. Cements with 15 % to 30 % granite sludge are consequently eco-efficient. With 15 % GS they can be classified as ordinary, with 20 % to 30 % as low heat cements and with 35% as very low heat cements.

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Section: Energy Performancementioning

confidence: 70%

Energy performance and calorimetric behaviour of cements bearing granite sludge

et al. 2019

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“…Los residuos calcinados fueron identificados de la manera siguiente: residuo de pizarra amarilla calcinado (RPAC) y residuo de pizarra parda calcinado (RPPC). La temperatura de calcinación fue seleccionada de acuerdo a las valoraciones reportadas en la literatura [33,36,37].…”

Section: Preparación De Las Muestrasunclassified

Evaluación de la reactividad puzolánica de residuos de pizarras del depósito Tchihingue en Angola: Influencia de la composición mineralógica

Mata

Reyes²,

Noguel³

2021

Matéria (Rio J.)

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RESUMEN En el presente trabajo se evaluaron residuos de rocas pizarras del depósito Tchihingue en Angola como posible fuente de materiales cementicios suplementarios, enfocado en la reactividad puzolánica y la composición mineralógica de los residuos de pizarra amarilla y pizarra parda. La caracterización química y mineralógica de residuos de pizarras sin calcinar y calcinados, se realizó por Espectrometría de Absorción Atómica (EAA) y difracción de rayos X (DRX), respectivamente. Ambos residuos de pizarras están compuestas por cuarzo y moscovita, y en la pizarra amarilla se identifica caolinita y en la pizarra parda hematita como fases secundarias. La reactividad puzolánica mediante solubilidad de sílice y alúmina en álcali y el índice de actividad de resistencia con cemento Portland, mostró que la pizarra amarilla calcinada presenta la mayor reactividad, lo cual está relacionado con la presencia de caolinita en la muestra, por ser la fase más activa entre los minerales arcillosos. Los residuos de pizarras evaluados cumplen con los requerimientos químicos y físicos-mecánicos, de acuerdo con la norma ASTM C 618, por lo que se considera que ambos residuos calcinados presentan perspectivas para ser empleados como materiales cementicios suplementarios.

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“…The values attributable to cement manufacture are known [43,70,71]. No references are available for BBA, however, for which consumption was estimated from the energy required to grind other materials.…”

Section: Eco-efficient Materialsmentioning

confidence: 99%