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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The Effect of Ladle Furnace Slag (LFS) Content Replacement as a Supplementary Cementitious Material in Portland Cement-Based Systems
https://orcid.org/http://orcid.org/0000-0003-4064-2828
https://orcid.org/http://orcid.org/0000-0002-1417-1615
https://orcid.org/http://orcid.org/0000-0001-5737-7819
Portland cement (OPC) and steelmaking industries exhibit high production levels and are expected to continue in the near future. Their industrial processes are not considered environmentally friendly and are estimated to be responsible for 4–7% of worldwide CO2 emissions. To mitigate their negative externalities, they introduce several improvements in their processes. The steelmaking industry generates a large volume of solid waste, mainly slags. Electric arc furnace slag (EAFS) and ladle furnace slag (LFS) shows exciting properties to be used as construction material. Currently, only EAFS is valorized, mainly as a granular material for different pavement layers. Instead, LFS presents technological barriers (low cementing activity and expansive problems) that prevent them from being valorized and finally deposited in landfills. This work explores a safe/high-value application for LFS as a supplementary cementitious material (SCM). Pastes/mortars were produced to study the effect of varying the LFS-content replacement. Chemical/mineralogical characterization of raw/hydrated samples and fresh/hardened state properties were tested at different ages to study the physical-mechanical performance and microstructure evolution. Our results suggest that LFS has good potential as SCM, modifying the fresh/hardened performance depending on LFS content: by decreasing workability, accelerating the setting time, and lowering the strength. Also, it increases the potential volumetric instability issues. The compressive strength gap decreases with time, reaching over 30 MPa for 25/50 wt% replacements at 28–98 days. Finally, the microstructure evolution shows a shift in the typical OPC hydration reactions, producing higher AFm-AFt products due to the higher calcium-aluminates reactive phases in the slag.
The Effect of Ladle Furnace Slag (LFS) Content Replacement as a Supplementary Cementitious Material in Portland Cement-Based Systems
https://orcid.org/http://orcid.org/0000-0003-4064-2828
https://orcid.org/http://orcid.org/0000-0002-1417-1615
https://orcid.org/http://orcid.org/0000-0001-5737-7819
Portland cement (OPC) and steelmaking industries exhibit high production levels and are expected to continue in the near future. Their industrial processes are not considered environmentally friendly and are estimated to be responsible for 4–7% of worldwide CO2 emissions. To mitigate their negative externalities, they introduce several improvements in their processes. The steelmaking industry generates a large volume of solid waste, mainly slags. Electric arc furnace slag (EAFS) and ladle furnace slag (LFS) shows exciting properties to be used as construction material. Currently, only EAFS is valorized, mainly as a granular material for different pavement layers. Instead, LFS presents technological barriers (low cementing activity and expansive problems) that prevent them from being valorized and finally deposited in landfills. This work explores a safe/high-value application for LFS as a supplementary cementitious material (SCM). Pastes/mortars were produced to study the effect of varying the LFS-content replacement. Chemical/mineralogical characterization of raw/hydrated samples and fresh/hardened state properties were tested at different ages to study the physical-mechanical performance and microstructure evolution. Our results suggest that LFS has good potential as SCM, modifying the fresh/hardened performance depending on LFS content: by decreasing workability, accelerating the setting time, and lowering the strength. Also, it increases the potential volumetric instability issues. The compressive strength gap decreases with time, reaching over 30 MPa for 25/50 wt% replacements at 28–98 days. Finally, the microstructure evolution shows a shift in the typical OPC hydration reactions, producing higher AFm-AFt products due to the higher calcium-aluminates reactive phases in the slag.
The Effect of Ladle Furnace Slag (LFS) Content Replacement as a Supplementary Cementitious Material in Portland Cement-Based Systems
https://orcid.org/http://orcid.org/0000-0003-4064-2828
https://orcid.org/http://orcid.org/0000-0002-1417-1615
https://orcid.org/http://orcid.org/0000-0001-5737-7819
Portland cement (OPC) and steelmaking industries exhibit high production levels and are expected to continue in the near future. Their industrial processes are not considered environmentally friendly and are estimated to be responsible for 4–7% of worldwide CO2 emissions. To mitigate their negative externalities, they introduce several improvements in their processes. The steelmaking industry generates a large volume of solid waste, mainly slags. Electric arc furnace slag (EAFS) and ladle furnace slag (LFS) shows exciting properties to be used as construction material. Currently, only EAFS is valorized, mainly as a granular material for different pavement layers. Instead, LFS presents technological barriers (low cementing activity and expansive problems) that prevent them from being valorized and finally deposited in landfills. This work explores a safe/high-value application for LFS as a supplementary cementitious material (SCM). Pastes/mortars were produced to study the effect of varying the LFS-content replacement. Chemical/mineralogical characterization of raw/hydrated samples and fresh/hardened state properties were tested at different ages to study the physical-mechanical performance and microstructure evolution. Our results suggest that LFS has good potential as SCM, modifying the fresh/hardened performance depending on LFS content: by decreasing workability, accelerating the setting time, and lowering the strength. Also, it increases the potential volumetric instability issues. The compressive strength gap decreases with time, reaching over 30 MPa for 25/50 wt% replacements at 28–98 days. Finally, the microstructure evolution shows a shift in the typical OPC hydration reactions, producing higher AFm-AFt products due to the higher calcium-aluminates reactive phases in the slag.
The Effect of Ladle Furnace Slag (LFS) Content Replacement as a Supplementary Cementitious Material in Portland Cement-Based Systems
RILEM Bookseries
Jędrzejewska, Agnieszka (Herausgeber:in) / Kanavaris, Fragkoulis (Herausgeber:in) / Azenha, Miguel (Herausgeber:in) / Benboudjema, Farid (Herausgeber:in) / Schlicke, Dirk (Herausgeber:in) / Araos, Paulo (Autor:in) / Uribarri, Anna (Autor:in) / Barra, Marilda (Autor:in) / Aponte, Diego (Autor:in)
International RILEM Conference on Synergising expertise towards sustainability and robustness of CBMs and concrete structures ; 2023 ; Milos Island, Greece
09.06.2023
12 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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