Activation of the fly ash pozzolanic reaction by hydrothermal conditions

Goñi, S.; Guerrero, A.; Luxán, María Pilar de; Macı́as, A.

doi:10.1016/s0008-8846(03)00085-1

Cited by 67 publications

(40 citation statements)

References 7 publications

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“…Thus far, many types of zeolite such as phillipsite, analcime, zeolite P, gismondine, and gmelinite have been successfully synthesized using fly ashes [9][10][11]. Recent reports also indicated that hydrothermal process could significantly increase fly ash pozzolanic reaction [12,13]. The resulting compounds can be used for immobilizing toxic wastes, and also have the potential to be used as the precursors of new kind of low-energy cements called fly ash belite cements.…”

Section: Introductionmentioning

confidence: 99%

Extraction of metals from municipal solid waste incinerator fly ash by hydrothermal process

Zhang

Itoh

2006

Journal of Hazardous Materials

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This work examined the extraction properties of metallic elements from municipal incinerator fly ash under hydrothermal conditions. The ash was firstly pre-washed by distilled water, then subjected to hydrothermal treatments. The pre-washing process was effective for Na, K, Ca extraction with extraction percentages of 67%, 76% and 48%, respectively. The optimum contact time was 30 min for the pre-washing process. Five types of acids were tested for the extraction experiments and hydrochloric acid was found to be most effective for metal extraction from the ash. Compared to room condition, hydrothermal treatment accelerated the dissolution of the ash, thus promoted the reaction of acid with hazardous metals such as Cr, Cd, Pb, and furthermore, the consumption speed of acid was slowed down under hydrothermal condition. The acid simultaneously reacted with all the metal in the ash under hydrothermal condition but preferentially reacted with Ca at room condition. The optimum hydrothermal treatment temperature, time and liquid/solid ratio were 150• C, 5 h and 10:1 (ml:g), respectively.

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Section: Introductionmentioning

confidence: 99%

Extraction of metals from municipal solid waste incinerator fly ash by hydrothermal process

Zhang

Itoh

2006

Journal of Hazardous Materials

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“…The difference between the initial and the final conductivities is calculated as a measure of pozzolanicity. This is identified as a rapid method to evaluate the pozzolanic effect of rice husk ash [10,15,19]. Table 1 gives the properties of the different RHA samples.…”

Section: Pozzolanicitymentioning

confidence: 99%

Reactive pozzolanas from rice husk ash: An alternative to cement for rural housing

Nair

Jagadish

Fraaij

2006

Cement and Concrete Research

126

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This paper discusses the properties of rice husk ash samples produced from different types of field ovens to compare the performance of the ovens and to identify the most feasible method to produce a reactive pozzolana as an alternative to cement for building applications requiring lower strengths. Different types of ashes are produced and long-term strength of rice husk ash pozzolanas with lime or cement is investigated to suggest a sustainable affordable option in rural building applications, especially for rural housing in Kerala, a southern state of India.

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“…En particular, los cementos belíticos de cenizas volantes (CBCV), obtenidos a partir de cenizas volantes tipo F y C, están siendo fabricados y caracterizados en nuestro laboratorio siguiendo una ruta hidrotermal-calcinación (23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35). El proceso de fabricación incluye un pretratamiento hidrotermal, donde se obtienen los geles puzolá-nicos hidratados precursores del cemento.…”

Section: I In Nt Tr Ro Od Du Uc Ct Ti Io On Nunclassified

“…In particular, fly ash belite cements (FABC) made from class F and C coal fly ash are being synthesized by us via calcination after hydrothermal treatment (23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35). The manufacturing process includes pre-hydrothermal treatment to obtain hydrated pozzolanic cement precursors, which are subsequently dehydrated under controlled heating conditions.…”

Section: I In Nt Tr Ro Od Du Uc Ct Ti Io On Nmentioning

confidence: 99%

Actividad hidráulica de un cemento belítico obtenido a partir de cenizas volantes tipo C: influencia del aditivo y tipo de curado

Goñi¹,

Guerrero²

2006

Mater. construcc.

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RESUMENEn este trabajo se discute la influencia del tipo de curado y de un aditivo reductor de la demanda de agua en la actividad hidráulica de un cemento belítico de cenizas volantes de alto contenido en cal denominado (CBCV-2-A). Este cemento ha sido sintetizado por una ruta húme-da hidrotermal con posterior calcinación, empleando ceniza volante de alto contenido en cal (ASTM tipo C) como materia prima. La actividad hidráulica se ha estudiado en la pasta de cemento, durante un periodo de 180 días, por medio del contenido de agua combinada, determinada por análisis termogravimétrico, y el grado de hidratación por difracción de rayos X (DRX). La resistencia mecánica y la porosidad total y distribución de tamaño de poro se han estudiado en probetas equivalentes de mortero.Palabras clave: cemento belítico, cenizas volantes, ruta hidrotermal, actividad hidráulica, aditivo.

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Activation of the fly ash pozzolanic reaction by hydrothermal conditions

Cited by 67 publications

References 7 publications

Extraction of metals from municipal solid waste incinerator fly ash by hydrothermal process

Extraction of metals from municipal solid waste incinerator fly ash by hydrothermal process

Reactive pozzolanas from rice husk ash: An alternative to cement for rural housing

Actividad hidráulica de un cemento belítico obtenido a partir de cenizas volantes tipo C: influencia del aditivo y tipo de curado

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