Pozzolanic improvements to fly ash when removing unburned carbon

Abstract: Through a very simple washing process with water, the unburned carbon is separated and removed from the fly ash. In this work, mixtures of mortar with 30% Portland cement replacement are made by different additions: integral fly ash (obtained from thermoelectric), washed fly ash (removing...

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Autores principales:	Roldán Latorre,Walter, Garcés Arroyo,Jorge
Lenguaje:	English
Publicado:	Escuela de Construcción Civil, Pontificia Universidad Católica de Chile 2018
Materias:	Pozzolanic enhancements unburned carbon removed fly ash washing pozzolanic portland cement concrete and mortar
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-915X2018000200296
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spelling	oai:scielo:S0718-915X20180002002962018-11-15Pozzolanic improvements to fly ash when removing unburned carbonRoldán Latorre,WalterGarcés Arroyo,Jorge Pozzolanic enhancements unburned carbon removed fly ash washing pozzolanic portland cement concrete and mortar Abstract: Through a very simple washing process with water, the unburned carbon is separated and removed from the fly ash. In this work, mixtures of mortar with 30% Portland cement replacement are made by different additions: integral fly ash (obtained from thermoelectric), washed fly ash (removing unburned carbon by washing), unburned carbon and limestone filler (limestone rock dust). To determine better the pozzolanic contribution of the additions, 5% gypsum (with respect to the weight of the binder) is added to the mixtures not hardened. With these mixtures, specimens are made for tests to rupture at 7, 28 and 90 days of age, kept submerged in water and also special specimens kept in similar condition measuring length variations. It is detected that the substitution of portland cement by unburned carbon, significantly reduces the mechanical resistance at any age and does not contribute to protection against sulphate attacks. It is concluded that the unburned carbon does not possess pozzolanic properties and its withdrawal generates benefits to the fly ash in the search to improve the pozzolanic performance in concrete mixtures.info:eu-repo/semantics/openAccessEscuela de Construcción Civil, Pontificia Universidad Católica de ChileRevista de la construcción v.17 n.2 20182018-08-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-915X2018000200296en10.7764/rdlc.17.2.296
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Pozzolanic enhancements unburned carbon removed fly ash washing pozzolanic portland cement concrete and mortar
spellingShingle	Pozzolanic enhancements unburned carbon removed fly ash washing pozzolanic portland cement concrete and mortar Roldán Latorre,Walter Garcés Arroyo,Jorge Pozzolanic improvements to fly ash when removing unburned carbon
description	Abstract: Through a very simple washing process with water, the unburned carbon is separated and removed from the fly ash. In this work, mixtures of mortar with 30% Portland cement replacement are made by different additions: integral fly ash (obtained from thermoelectric), washed fly ash (removing unburned carbon by washing), unburned carbon and limestone filler (limestone rock dust). To determine better the pozzolanic contribution of the additions, 5% gypsum (with respect to the weight of the binder) is added to the mixtures not hardened. With these mixtures, specimens are made for tests to rupture at 7, 28 and 90 days of age, kept submerged in water and also special specimens kept in similar condition measuring length variations. It is detected that the substitution of portland cement by unburned carbon, significantly reduces the mechanical resistance at any age and does not contribute to protection against sulphate attacks. It is concluded that the unburned carbon does not possess pozzolanic properties and its withdrawal generates benefits to the fly ash in the search to improve the pozzolanic performance in concrete mixtures.
author	Roldán Latorre,Walter Garcés Arroyo,Jorge
author_facet	Roldán Latorre,Walter Garcés Arroyo,Jorge
author_sort	Roldán Latorre,Walter
title	Pozzolanic improvements to fly ash when removing unburned carbon
title_short	Pozzolanic improvements to fly ash when removing unburned carbon
title_full	Pozzolanic improvements to fly ash when removing unburned carbon
title_fullStr	Pozzolanic improvements to fly ash when removing unburned carbon
title_full_unstemmed	Pozzolanic improvements to fly ash when removing unburned carbon
title_sort	pozzolanic improvements to fly ash when removing unburned carbon
publisher	Escuela de Construcción Civil, Pontificia Universidad Católica de Chile
publishDate	2018
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-915X2018000200296
work_keys_str_mv	AT roldanlatorrewalter pozzolanicimprovementstoflyashwhenremovingunburnedcarbon AT garcesarroyojorge pozzolanicimprovementstoflyashwhenremovingunburnedcarbon
_version_	1714206292180992000

Pozzolanic improvements to fly ash when removing unburned carbon

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