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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| Format: | Article |
| Language: | English |
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Elsevier
2024-12-01
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| Series: | Cement |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666549224000240 |
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| _version_ | 1850109498711080960 |
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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. |
| format | Article |
| id | doaj-art-232dd863ee2d4b4c9c2259a3b569b715 |
| institution | OA Journals |
| issn | 2666-5492 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Cement |
| 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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