A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Carbonation of Concrete Slurry Waste and Its Use as Supplementary Cementitious Material
https://orcid.org/http://orcid.org/0000-0002-6864-6196
https://orcid.org/http://orcid.org/0000-0003-4245-5903
Concrete slurry waste is generated at concrete plants and generally re-used in new batches of concretes. Due to the presence of hydrated cement paste it has the potential to be carbonated prior to re-use in order not only to store CO2, but also to enhance its reactivity. In this study, a concrete waste slurry obtained at a ready-mix concrete plant was investigated. For accelerated carbonation, a wet process in laboratory scale was used. The carbonated product was dried afterwards, characterized and used as supplementary cementitious material. When carbonated, the hydrate phases of the concrete waste slurry decomposed to calcite, gypsum and a silica-alumina gel. When blended with Portland cement (30% replacement by mass) early hydration kinetics was accelerated by the carbonated concrete slurry waste. The pozzolanic reaction of the silica-alumina gel consumed a significant part of the portlandite and showed a positive contribution to compressive strength compared to inert quartz powder and to the uncarbonated concrete slurry.
Carbonation of Concrete Slurry Waste and Its Use as Supplementary Cementitious Material
https://orcid.org/http://orcid.org/0000-0002-6864-6196
https://orcid.org/http://orcid.org/0000-0003-4245-5903
Concrete slurry waste is generated at concrete plants and generally re-used in new batches of concretes. Due to the presence of hydrated cement paste it has the potential to be carbonated prior to re-use in order not only to store CO2, but also to enhance its reactivity. In this study, a concrete waste slurry obtained at a ready-mix concrete plant was investigated. For accelerated carbonation, a wet process in laboratory scale was used. The carbonated product was dried afterwards, characterized and used as supplementary cementitious material. When carbonated, the hydrate phases of the concrete waste slurry decomposed to calcite, gypsum and a silica-alumina gel. When blended with Portland cement (30% replacement by mass) early hydration kinetics was accelerated by the carbonated concrete slurry waste. The pozzolanic reaction of the silica-alumina gel consumed a significant part of the portlandite and showed a positive contribution to compressive strength compared to inert quartz powder and to the uncarbonated concrete slurry.
Carbonation of Concrete Slurry Waste and Its Use as Supplementary Cementitious Material
https://orcid.org/http://orcid.org/0000-0002-6864-6196
https://orcid.org/http://orcid.org/0000-0003-4245-5903
Concrete slurry waste is generated at concrete plants and generally re-used in new batches of concretes. Due to the presence of hydrated cement paste it has the potential to be carbonated prior to re-use in order not only to store CO2, but also to enhance its reactivity. In this study, a concrete waste slurry obtained at a ready-mix concrete plant was investigated. For accelerated carbonation, a wet process in laboratory scale was used. The carbonated product was dried afterwards, characterized and used as supplementary cementitious material. When carbonated, the hydrate phases of the concrete waste slurry decomposed to calcite, gypsum and a silica-alumina gel. When blended with Portland cement (30% replacement by mass) early hydration kinetics was accelerated by the carbonated concrete slurry waste. The pozzolanic reaction of the silica-alumina gel consumed a significant part of the portlandite and showed a positive contribution to compressive strength compared to inert quartz powder and to the uncarbonated concrete slurry.
Carbonation of Concrete Slurry Waste and Its Use as Supplementary Cementitious Material
RILEM Bookseries
Jędrzejewska, Agnieszka (editor) / Kanavaris, Fragkoulis (editor) / Azenha, Miguel (editor) / Benboudjema, Farid (editor) / Schlicke, Dirk (editor) / Winnefeld, Frank (author) / Tiefenthaler, Johannes (author) / Leemann, Andreas (author)
International RILEM Conference on Synergising expertise towards sustainability and robustness of CBMs and concrete structures ; 2023 ; Milos Island, Greece
2023-06-09
10 pages
Article/Chapter (Book)
Electronic Resource
English