TY - JOUR
T1 - Physicochemical characterization of unconventional fly ashes
AU - Wang, Ying
AU - Acarturk, B. Cansu
AU - Burris, Lisa
AU - Hooton, R. Douglas
AU - Shearer, Christopher R.
AU - Suraneni, Prannoy
N1 - Funding Information:
The authors gratefully acknowledge funding from the Transportation Research Board’s National Cooperative Highway Research Program (NCHRP) for the Project NCHRP 10-104: Recommendations for Revision of AASHTO M 295 Standard Specification to Include Marginal and Unconventional Source Coal Fly Ashes. Support from the Knight Foundation Endowment in the College of Engineering (University of Miami) is gratefully acknowledged. The first author acknowledges financial support from the American Coal Ash Association Educational Foundation ( ACAAEF ) John Faber Scholarship, the ASTM International Katharine and Bryant Mather Scholarship, and the Environmental Research and Education Foundation (EREF) Scholarship. Boral Resources and SEFA Group are thanked for supplying some studied fly ashes. Ivan Diaz (Boral Resources) is thanked for his insightful comments which have helped shape some of the authors thoughts on this topic. Andrea Tito, Jasmine Kaur, and Cynthia Jimenez (Titan America) are thanked for their assistance with x-ray fluorescence and laser diffraction testing. James Coakley (University of Miami) is thanked for access to the SEM. The views expressed in this article are those of the authors who are conducting this investigation and do not necessarily reflect those of the Transportation Research Board, the National Academies of Sciences, Engineering, and Medicine, or the American Association of State Highway and Transportation Officials, the sponsors of the NCHRP.
Funding Information:
The authors gratefully acknowledge funding from the Transportation Research Board's National Cooperative Highway Research Program (NCHRP) for the Project NCHRP 10-104: Recommendations for Revision of AASHTO M 295 Standard Specification to Include Marginal and Unconventional Source Coal Fly Ashes. Support from the Knight Foundation Endowment in the College of Engineering (University of Miami) is gratefully acknowledged. The first author acknowledges financial support from the American Coal Ash Association Educational Foundation (ACAAEF) John Faber Scholarship, the ASTM International Katharine and Bryant Mather Scholarship, and the Environmental Research and Education Foundation (EREF) Scholarship. Boral Resources and SEFA Group are thanked for supplying some studied fly ashes. Ivan Diaz (Boral Resources) is thanked for his insightful comments which have helped shape some of the authors thoughts on this topic. Andrea Tito, Jasmine Kaur, and Cynthia Jimenez (Titan America) are thanked for their assistance with x-ray fluorescence and laser diffraction testing. James Coakley (University of Miami) is thanked for access to the SEM. The views expressed in this article are those of the authors who are conducting this investigation and do not necessarily reflect those of the Transportation Research Board, the National Academies of Sciences, Engineering, and Medicine, or the American Association of State Highway and Transportation Officials, the sponsors of the NCHRP.
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/5/15
Y1 - 2022/5/15
N2 - As the supply-demand disparity of virgin fly ash increases, there is an urgent need for utilization of unconventional fly ashes. This paper characterizes a set of 19 different fly ashes, including marginal, off-spec, landfilled, or beneficiated materials using extensive physicochemical powder characterization. The chemical composition, mineralogical composition, moisture content, loss on ignition, fineness, morphology, and specific gravity of the fly ashes were determined. Some fly ashes displayed unusual properties; however, many unconventional source fly ashes did not show properties substantially different from conventional fly ashes. Several interesting correlations in the measured properties were found for the fly ashes. The three measures of fineness or particle size correlated with each other. Loss on ignition values measured using a furnace and thermogravimetric analysis correlated but both temperature and atmosphere affected the measured values and the correlation. Electron microscopy provides important information regarding particle sizes, shapes, and potential contaminants for the unconventional fly ashes.
AB - As the supply-demand disparity of virgin fly ash increases, there is an urgent need for utilization of unconventional fly ashes. This paper characterizes a set of 19 different fly ashes, including marginal, off-spec, landfilled, or beneficiated materials using extensive physicochemical powder characterization. The chemical composition, mineralogical composition, moisture content, loss on ignition, fineness, morphology, and specific gravity of the fly ashes were determined. Some fly ashes displayed unusual properties; however, many unconventional source fly ashes did not show properties substantially different from conventional fly ashes. Several interesting correlations in the measured properties were found for the fly ashes. The three measures of fineness or particle size correlated with each other. Loss on ignition values measured using a furnace and thermogravimetric analysis correlated but both temperature and atmosphere affected the measured values and the correlation. Electron microscopy provides important information regarding particle sizes, shapes, and potential contaminants for the unconventional fly ashes.
KW - Chemical composition
KW - Electron microscopy
KW - Fineness
KW - Fly ash
KW - Off-spec
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U2 - 10.1016/j.fuel.2022.123318
DO - 10.1016/j.fuel.2022.123318
M3 - Article
AN - SCOPUS:85124391846
VL - 316
JO - Fuel
JF - Fuel
SN - 0016-2361
M1 - 123318
ER -