Fluidized Bed Combustion (FBC) fly ash and its performance in concrete

Mona Zahedi; Farshad Rajabipour

doi:10.14359/51716720

Fluidized Bed Combustion (FBC) fly ash and its performance in concrete

Mona Zahedi, Farshad Rajabipour

Civil and Environmental Engineering

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

31 Scopus citations

Abstract

Concerns over the availability and quality of conventional fly ash for use in concrete has become widespread in recent years. Fluidized bed combustion (FBC) ash, with its annual U.S. production exceeding 14 million tons, could serve as a reasonable alternative. In this study, two compositionally different fly ashes from circulating FBC (CFBC) power plants were evaluated for their compliance with the ASTM C618 standard and their impact on the fresh and hardened properties of concrete. The pozzolanic reactivity of the fly ashes was also quantified based on the emerging RILEM test method. These fly ashes met the chemical and physical requirements of ASTM, except for elevated LOI (in both fly ashes) and elevated SO3 (in one fly ash). Despite this, concrete with proper slump, air content, and strength development could be produced by proper dosing of chemical admixtures. The elevated SO3 was found not to produce deleterious expansions.

Original language	English (US)
Pages (from-to)	163-172
Number of pages	10
Journal	ACI Materials Journal
Volume	116
Issue number	4
DOIs	https://doi.org/10.14359/51716720
State	Published - Jul 2019

All Science Journal Classification (ASJC) codes

Civil and Structural Engineering
Building and Construction
General Materials Science

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10.14359/51716720

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title = "Fluidized Bed Combustion (FBC) fly ash and its performance in concrete",

abstract = "Concerns over the availability and quality of conventional fly ash for use in concrete has become widespread in recent years. Fluidized bed combustion (FBC) ash, with its annual U.S. production exceeding 14 million tons, could serve as a reasonable alternative. In this study, two compositionally different fly ashes from circulating FBC (CFBC) power plants were evaluated for their compliance with the ASTM C618 standard and their impact on the fresh and hardened properties of concrete. The pozzolanic reactivity of the fly ashes was also quantified based on the emerging RILEM test method. These fly ashes met the chemical and physical requirements of ASTM, except for elevated LOI (in both fly ashes) and elevated SO3 (in one fly ash). Despite this, concrete with proper slump, air content, and strength development could be produced by proper dosing of chemical admixtures. The elevated SO3 was found not to produce deleterious expansions.",

author = "Mona Zahedi and Farshad Rajabipour",

note = "Funding Information: The authors wish to express their gratitude to the ACI Foundation and Pennsylvania Coal Ash Research Group (PCARG) for the financial support of this research. Any opinions, findings, conclusions, or recommendations expressed in this manuscript are those of the authors solely and do not necessarily reflect the views of the funding organizations. The authors are also extremely thankful to S. Feldman at the National Institute of Standards and Technology, N. Wonderling at Penn State{\textquoteright}s Materials Characterization Laboratory, and D. Fura at Penn State{\textquoteright}s Civil Infrastructure Testing and Evaluation Laboratory for their invaluable insights and technical support. Publisher Copyright: {\textcopyright} 2019, American Concrete Institute.",

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N1 - Funding Information: The authors wish to express their gratitude to the ACI Foundation and Pennsylvania Coal Ash Research Group (PCARG) for the financial support of this research. Any opinions, findings, conclusions, or recommendations expressed in this manuscript are those of the authors solely and do not necessarily reflect the views of the funding organizations. The authors are also extremely thankful to S. Feldman at the National Institute of Standards and Technology, N. Wonderling at Penn State’s Materials Characterization Laboratory, and D. Fura at Penn State’s Civil Infrastructure Testing and Evaluation Laboratory for their invaluable insights and technical support. Publisher Copyright: © 2019, American Concrete Institute.

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N2 - Concerns over the availability and quality of conventional fly ash for use in concrete has become widespread in recent years. Fluidized bed combustion (FBC) ash, with its annual U.S. production exceeding 14 million tons, could serve as a reasonable alternative. In this study, two compositionally different fly ashes from circulating FBC (CFBC) power plants were evaluated for their compliance with the ASTM C618 standard and their impact on the fresh and hardened properties of concrete. The pozzolanic reactivity of the fly ashes was also quantified based on the emerging RILEM test method. These fly ashes met the chemical and physical requirements of ASTM, except for elevated LOI (in both fly ashes) and elevated SO3 (in one fly ash). Despite this, concrete with proper slump, air content, and strength development could be produced by proper dosing of chemical admixtures. The elevated SO3 was found not to produce deleterious expansions.

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Fluidized Bed Combustion (FBC) fly ash and its performance in concrete

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