Use of gypsum and CKD to enhance early age strength of High Volume Fly Ash (HVFA) pastes

Dali Bondar; Eoin Coakley

doi:10.1016/j.conbuildmat.2014.08.015

Use of gypsum and CKD to enhance early age strength of High Volume Fly Ash (HVFA) pastes

Dali Bondar, Eoin Coakley

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

200 Downloads (Pure)

Abstract

Use of higher proportions of fly ash as a cement replacement in concrete has obvious environmental and performance benefits but high volumes of fly ash are not commonly used due to perceived lower early age strengths. In this investigation, addition of cement kiln dust (CKD) and gypsum to activate the fly ash was studied and the proportions used in the paste mixes were designed to optimize the mixture ingredients to achieve the highest early age compressive strength. Change of mineral phase composition and micro structure of the composites was analyzed. It was found that CKD was much more effective in activating the fly ash than gypsum. Appreciable early age compressive strengths were achieved for fly ash contents up to 60% of the binder and these observations were supported by analysis of the mineral phases.

Original language	English
Pages (from-to)	93-108
Journal	Construction and Building Materials
Volume	71
Early online date	15 Sept 2014
DOIs	https://doi.org/10.1016/j.conbuildmat.2014.08.015
Publication status	Published - 30 Nov 2014

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Construction and Building Materials. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Construction and Building Materials [Vol 71 (2014)] DOI: 10.1016/j.conbuildmat.2014.08.015.

Funder

Engineering and Physical Sciences Research Council (EPSRC) under Grant [EP/J016055/1].

Keywords

high volume fly ash (HVFA) concrete
early age strength (EAS)
cement kiln dust (CKD)
gypsum
mineral phases

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10.1016/j.conbuildmat.2014.08.015

Use of gypsum

Eoin Coakley
- School of Energy, Construction and Environment - Curriculum Lead Associate Professor - Academic
Person: Teaching and Research

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title = "Use of gypsum and CKD to enhance early age strength of High Volume Fly Ash (HVFA) pastes",

abstract = "Use of higher proportions of fly ash as a cement replacement in concrete has obvious environmental and performance benefits but high volumes of fly ash are not commonly used due to perceived lower early age strengths. In this investigation, addition of cement kiln dust (CKD) and gypsum to activate the fly ash was studied and the proportions used in the paste mixes were designed to optimize the mixture ingredients to achieve the highest early age compressive strength. Change of mineral phase composition and micro structure of the composites was analyzed. It was found that CKD was much more effective in activating the fly ash than gypsum. Appreciable early age compressive strengths were achieved for fly ash contents up to 60% of the binder and these observations were supported by analysis of the mineral phases. ",

keywords = "high volume fly ash (HVFA) concrete, early age strength (EAS), cement kiln dust (CKD), gypsum, mineral phases",

author = "Dali Bondar and Eoin Coakley",

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AU - Bondar, Dali

AU - Coakley, Eoin

N1 - NOTICE: this is the author’s version of a work that was accepted for publication in Construction and Building Materials. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Construction and Building Materials [Vol 71 (2014)] DOI: 10.1016/j.conbuildmat.2014.08.015.

PY - 2014/11/30

Y1 - 2014/11/30

N2 - Use of higher proportions of fly ash as a cement replacement in concrete has obvious environmental and performance benefits but high volumes of fly ash are not commonly used due to perceived lower early age strengths. In this investigation, addition of cement kiln dust (CKD) and gypsum to activate the fly ash was studied and the proportions used in the paste mixes were designed to optimize the mixture ingredients to achieve the highest early age compressive strength. Change of mineral phase composition and micro structure of the composites was analyzed. It was found that CKD was much more effective in activating the fly ash than gypsum. Appreciable early age compressive strengths were achieved for fly ash contents up to 60% of the binder and these observations were supported by analysis of the mineral phases.

AB - Use of higher proportions of fly ash as a cement replacement in concrete has obvious environmental and performance benefits but high volumes of fly ash are not commonly used due to perceived lower early age strengths. In this investigation, addition of cement kiln dust (CKD) and gypsum to activate the fly ash was studied and the proportions used in the paste mixes were designed to optimize the mixture ingredients to achieve the highest early age compressive strength. Change of mineral phase composition and micro structure of the composites was analyzed. It was found that CKD was much more effective in activating the fly ash than gypsum. Appreciable early age compressive strengths were achieved for fly ash contents up to 60% of the binder and these observations were supported by analysis of the mineral phases.

KW - high volume fly ash (HVFA) concrete

KW - early age strength (EAS)

KW - cement kiln dust (CKD)

KW - gypsum

KW - mineral phases

U2 - 10.1016/j.conbuildmat.2014.08.015

DO - 10.1016/j.conbuildmat.2014.08.015

M3 - Article

SN - 0950-0618

VL - 71

SP - 93

EP - 108

JO - Construction and Building Materials

JF - Construction and Building Materials

ER -

Use of gypsum and CKD to enhance early age strength of High Volume Fly Ash (HVFA) pastes

Abstract

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Eoin Coakley

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