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MgO-induced phase variation in alkali-activated binders synthesized under hydrothermal conditions
https://orcid.org/0000-0003-0746-3940
Abstract The effects of magnesium content in the precursors on the phase formation and microstructural variation of alkali-activated binders under hydrothermal conditions are investigated. One-step hydrothermal treatment method was applied on all samples synthesized from industrial by-products (e.g., fly ash and slag), MgO powders, and alkali activator, and they were characterized by compressive strength tests, XRD, SEM, $ N_{2} $ sorption, and FTIR analyses. The samples containing zeolite Na-P1 and hydrotalcite crystals were obtained until the Mg/(Al + Si) molar ratio was higher than 0.58 with a 20 wt.% slag content in the precursor, however, the samples with 40 wt.% slag content possessed both of these phases even at lower Mg/(Al + Si) molar ratio of 0.39. Specifically, increasing the Mg/(Al + Si) ratio significantly reduced the formation of zeolite Na-P1, while promoted the formation of hydrotalcite. Furthermore, the extended hydrothermal treatment promoted the formation of zeolite Na-P1, but simultaneously reduced the formation of hydrotalcite. All samples exhibited mesoporous characteristics having major sorption behaviors of multilayer physisorption and capillary condensation.
MgO-induced phase variation in alkali-activated binders synthesized under hydrothermal conditions
https://orcid.org/0000-0003-0746-3940
Abstract The effects of magnesium content in the precursors on the phase formation and microstructural variation of alkali-activated binders under hydrothermal conditions are investigated. One-step hydrothermal treatment method was applied on all samples synthesized from industrial by-products (e.g., fly ash and slag), MgO powders, and alkali activator, and they were characterized by compressive strength tests, XRD, SEM, $ N_{2} $ sorption, and FTIR analyses. The samples containing zeolite Na-P1 and hydrotalcite crystals were obtained until the Mg/(Al + Si) molar ratio was higher than 0.58 with a 20 wt.% slag content in the precursor, however, the samples with 40 wt.% slag content possessed both of these phases even at lower Mg/(Al + Si) molar ratio of 0.39. Specifically, increasing the Mg/(Al + Si) ratio significantly reduced the formation of zeolite Na-P1, while promoted the formation of hydrotalcite. Furthermore, the extended hydrothermal treatment promoted the formation of zeolite Na-P1, but simultaneously reduced the formation of hydrotalcite. All samples exhibited mesoporous characteristics having major sorption behaviors of multilayer physisorption and capillary condensation.
MgO-induced phase variation in alkali-activated binders synthesized under hydrothermal conditions
https://orcid.org/0000-0003-0746-3940
Abstract The effects of magnesium content in the precursors on the phase formation and microstructural variation of alkali-activated binders under hydrothermal conditions are investigated. One-step hydrothermal treatment method was applied on all samples synthesized from industrial by-products (e.g., fly ash and slag), MgO powders, and alkali activator, and they were characterized by compressive strength tests, XRD, SEM, $ N_{2} $ sorption, and FTIR analyses. The samples containing zeolite Na-P1 and hydrotalcite crystals were obtained until the Mg/(Al + Si) molar ratio was higher than 0.58 with a 20 wt.% slag content in the precursor, however, the samples with 40 wt.% slag content possessed both of these phases even at lower Mg/(Al + Si) molar ratio of 0.39. Specifically, increasing the Mg/(Al + Si) ratio significantly reduced the formation of zeolite Na-P1, while promoted the formation of hydrotalcite. Furthermore, the extended hydrothermal treatment promoted the formation of zeolite Na-P1, but simultaneously reduced the formation of hydrotalcite. All samples exhibited mesoporous characteristics having major sorption behaviors of multilayer physisorption and capillary condensation.
MgO-induced phase variation in alkali-activated binders synthesized under hydrothermal conditions
Wang, Z. (author) / Khalid, Hammad R. (author) / Park, S. M. (author) / Bae, S. J. (author) / Lee, H. K. (author)
2021
Article (Journal)
Electronic Resource
English
MgO-induced phase variation in alkali-activated binders synthesized under hydrothermal conditions
| Springer Verlag | 2021
Phase diagrams for alkali-activated slag binders
| Online Contents | 2017
Phase diagrams for alkali-activated slag binders
| British Library Online Contents | 2017
Phase diagrams for alkali-activated slag binders
| British Library Online Contents | 2017
Phase diagrams for alkali-activated slag binders
| Elsevier | 2017