Phase evolution and performance of sodium sulfate-activated slag cement pastes
This study evaluates the reaction kinetics, phase assemblage, and microstructure evolution of Na2SO4-activated slag cements produced with three commercial slags. The main reaction products identified are ettringite and calcium aluminosilicate hydrates, alongside a poorly crystalline SO42- intercalat...
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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/S2666549224000264 |
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| author | Zengliang Yue Yuvaraj Dhandapani Samuel Adu-Amankwah Susan A. Bernal |
| author_facet | Zengliang Yue Yuvaraj Dhandapani Samuel Adu-Amankwah Susan A. Bernal |
| author_sort | Zengliang Yue |
| collection | DOAJ |
| description | This study evaluates the reaction kinetics, phase assemblage, and microstructure evolution of Na2SO4-activated slag cements produced with three commercial slags. The main reaction products identified are ettringite and calcium aluminosilicate hydrates, alongside a poorly crystalline SO42- intercalated Mg-Al-layered double hydroxide (LDH) phase. Results revealed that the Al2O3 slag content alone does not correlate with the cement performance. While pastes made with a higher Al2O3 content slag exhibit faster reaction kinetics, those made with a slag with a higher Mg/Al ratio developed superior compressive strength and reduced porosity over extended curing periods. Thermodynamic modelling simulations indicate that sulfate consumption occurs via ettringite and LDH phase formation, influencing the slag reaction degree, pH value, and porosity reduction in these cements. This research highlights the critical role of slag composition in controlling microstructure and, consequently, performance of sodium sulfate activated slag cement pastes. |
| format | Article |
| id | doaj-art-41f81e25112a4b9f8b784b83713dc84d |
| institution | OA Journals |
| issn | 2666-5492 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Cement |
| spelling | doaj-art-41f81e25112a4b9f8b784b83713dc84d2025-08-20T02:38:03ZengElsevierCement2666-54922024-12-011810011710.1016/j.cement.2024.100117Phase evolution and performance of sodium sulfate-activated slag cement pastesZengliang Yue0Yuvaraj Dhandapani1Samuel Adu-Amankwah2Susan A. Bernal3School of Civil Engineering, University of Leeds, Leeds LS2 9JT, United KingdomSchool of Civil Engineering, University of Leeds, Leeds LS2 9JT, United KingdomSchool of Civil Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom; Department of Civil Engineering, Aston University Birmingham, Aston St, B4 7ET, United KingdomSchool of Civil Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom; Corresponding author.This study evaluates the reaction kinetics, phase assemblage, and microstructure evolution of Na2SO4-activated slag cements produced with three commercial slags. The main reaction products identified are ettringite and calcium aluminosilicate hydrates, alongside a poorly crystalline SO42- intercalated Mg-Al-layered double hydroxide (LDH) phase. Results revealed that the Al2O3 slag content alone does not correlate with the cement performance. While pastes made with a higher Al2O3 content slag exhibit faster reaction kinetics, those made with a slag with a higher Mg/Al ratio developed superior compressive strength and reduced porosity over extended curing periods. Thermodynamic modelling simulations indicate that sulfate consumption occurs via ettringite and LDH phase formation, influencing the slag reaction degree, pH value, and porosity reduction in these cements. This research highlights the critical role of slag composition in controlling microstructure and, consequently, performance of sodium sulfate activated slag cement pastes.http://www.sciencedirect.com/science/article/pii/S2666549224000264Blast furnace slagAlkali-activated cementsSodium sulfateMicrostructureThermodynamic modellingCompressive strength |
| spellingShingle | Zengliang Yue Yuvaraj Dhandapani Samuel Adu-Amankwah Susan A. Bernal Phase evolution and performance of sodium sulfate-activated slag cement pastes Cement Blast furnace slag Alkali-activated cements Sodium sulfate Microstructure Thermodynamic modelling Compressive strength |
| title | Phase evolution and performance of sodium sulfate-activated slag cement pastes |
| title_full | Phase evolution and performance of sodium sulfate-activated slag cement pastes |
| title_fullStr | Phase evolution and performance of sodium sulfate-activated slag cement pastes |
| title_full_unstemmed | Phase evolution and performance of sodium sulfate-activated slag cement pastes |
| title_short | Phase evolution and performance of sodium sulfate-activated slag cement pastes |
| title_sort | phase evolution and performance of sodium sulfate activated slag cement pastes |
| topic | Blast furnace slag Alkali-activated cements Sodium sulfate Microstructure Thermodynamic modelling Compressive strength |
| url | http://www.sciencedirect.com/science/article/pii/S2666549224000264 |
| work_keys_str_mv | AT zengliangyue phaseevolutionandperformanceofsodiumsulfateactivatedslagcementpastes AT yuvarajdhandapani phaseevolutionandperformanceofsodiumsulfateactivatedslagcementpastes AT samueladuamankwah phaseevolutionandperformanceofsodiumsulfateactivatedslagcementpastes AT susanabernal phaseevolutionandperformanceofsodiumsulfateactivatedslagcementpastes |