Measuring concrete air-entraining admixture adsorption on coal ash using three-phase equilibrium and fluorescence-based methods

This manuscript presents two novel methods of evaluating the adsorption of air-entraining admixtures (AEAs) by coal ashes used in cementitious mixtures. A developed three-phase equilibrium (TPE) method measures fly ash adsorption capacity accounting for carbon adsorption, Ca2+ interactions with AEA,...

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Main Authors: Yujia Min, Erin Stewartson, Prannoy Suraneni, Christopher R. Shearer, R. Doug Hooton, Lisa E. Burris
Format: Article
Language:English
Published: Elsevier 2024-12-01
Series:Cement
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S2666549224000240
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author Yujia Min
Erin Stewartson
Prannoy Suraneni
Christopher R. Shearer
R. Doug Hooton
Lisa E. Burris
author_facet Yujia Min
Erin Stewartson
Prannoy Suraneni
Christopher R. Shearer
R. Doug Hooton
Lisa E. Burris
author_sort Yujia Min
collection DOAJ
description This manuscript presents two novel methods of evaluating the adsorption of air-entraining admixtures (AEAs) by coal ashes used in cementitious mixtures. A developed three-phase equilibrium (TPE) method measures fly ash adsorption capacity accounting for carbon adsorption, Ca2+ interactions with AEA, and the equilibrium between the two. A fluorescence-based method (FBM) was also developed, utilizing a non-ionic NP-10 surfactant as a representative for AEA. This study verifies the applicability and accuracy of the TPE and FBM methods using seven class C and F coal ashes with a wide range of loss on ignition values, varying from 0.2 to 15.6 %, and three commercial AEAs. Verified with foam index test results, the TPE method was applicable to all tested AEAs and coal ashes. The results were consistent between the FBM and TPE methods when comparing rosin- and fatty acid-based AEAs, but less consistent when using a sulfonate-based AEA. These findings help us understand the applicability and limitations of the TPE and FBM methods and provide two methods for quantifying adsorption in fly ash samples.
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spelling doaj-art-232dd863ee2d4b4c9c2259a3b569b7152025-08-20T02:38:03ZengElsevierCement2666-54922024-12-011810011510.1016/j.cement.2024.100115Measuring concrete air-entraining admixture adsorption on coal ash using three-phase equilibrium and fluorescence-based methodsYujia Min0Erin Stewartson1Prannoy Suraneni2Christopher R. Shearer3R. Doug Hooton4Lisa E. Burris5Department of Civil, Environmental and Geodetic Engineering, Ohio State University, Columbus, OH 43210, USADepartment of Civil, Environmental and Geodetic Engineering, Ohio State University, Columbus, OH 43210, USADepartment of Civil and Architectural Engineering, University of Miami, Coral Gables, FL 33146, USADepartment of Civil and Environmental Engineering, South Dakota School of Mines & Technology, Rapid City, SD 57701, USADepartment of Civil and Mineral Engineering, University of Toronto, 35 St. George St., Toronto, ON M5S 1A4, CanadaDepartment of Civil, Environmental and Geodetic Engineering, Ohio State University, Columbus, OH 43210, USA; Corresponding author at: 211A Bolz Hall, 2070 Neil Ave, Columbus, OH 43210, USAThis manuscript presents two novel methods of evaluating the adsorption of air-entraining admixtures (AEAs) by coal ashes used in cementitious mixtures. A developed three-phase equilibrium (TPE) method measures fly ash adsorption capacity accounting for carbon adsorption, Ca2+ interactions with AEA, and the equilibrium between the two. A fluorescence-based method (FBM) was also developed, utilizing a non-ionic NP-10 surfactant as a representative for AEA. This study verifies the applicability and accuracy of the TPE and FBM methods using seven class C and F coal ashes with a wide range of loss on ignition values, varying from 0.2 to 15.6 %, and three commercial AEAs. Verified with foam index test results, the TPE method was applicable to all tested AEAs and coal ashes. The results were consistent between the FBM and TPE methods when comparing rosin- and fatty acid-based AEAs, but less consistent when using a sulfonate-based AEA. These findings help us understand the applicability and limitations of the TPE and FBM methods and provide two methods for quantifying adsorption in fly ash samples.http://www.sciencedirect.com/science/article/pii/S2666549224000240Fly ashAdsorptionAir entraining agentFluorescencePortland cement
spellingShingle Yujia Min
Erin Stewartson
Prannoy Suraneni
Christopher R. Shearer
R. Doug Hooton
Lisa E. Burris
Measuring concrete air-entraining admixture adsorption on coal ash using three-phase equilibrium and fluorescence-based methods
Cement
Fly ash
Adsorption
Air entraining agent
Fluorescence
Portland cement
title Measuring concrete air-entraining admixture adsorption on coal ash using three-phase equilibrium and fluorescence-based methods
title_full Measuring concrete air-entraining admixture adsorption on coal ash using three-phase equilibrium and fluorescence-based methods
title_fullStr Measuring concrete air-entraining admixture adsorption on coal ash using three-phase equilibrium and fluorescence-based methods
title_full_unstemmed Measuring concrete air-entraining admixture adsorption on coal ash using three-phase equilibrium and fluorescence-based methods
title_short Measuring concrete air-entraining admixture adsorption on coal ash using three-phase equilibrium and fluorescence-based methods
title_sort measuring concrete air entraining admixture adsorption on coal ash using three phase equilibrium and fluorescence based methods
topic Fly ash
Adsorption
Air entraining agent
Fluorescence
Portland cement
url http://www.sciencedirect.com/science/article/pii/S2666549224000240
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