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A platform for research: civil engineering, architecture and urbanism
High-strength KOBM steel slag binder activated by carbonation
Highlights Carbonation-activated steel slag can create a 2h strength of 80MPa and 28-day strength of 109MPa. The early strength is attributed to the carbonation of γ-C2S. The late strength is due to the hydration of β-C2S. Carbon-activated steel slag can be used as a green cementing binder to replace OPC.
Abstract The feasibility of developing a high strength KOBM (Klockner Oxygen Blown Maxhutte) steel slag binder activated by carbonation as an alternative cementing material was investigated. After two-hour carbonation reaction, steel slag compacts displayed a 2h compressive strength of 80MPa with a CO2 uptake of 13%. Early strength gain was attributed to the carbonation of the slag’s γ-C2S component. Subsequent hydration enhanced the ultimate strength to 109MPa, owing to the latent hydraulic reactivity of the β-C2S component. The carbon-activated slag presented a more sustainable alternative to Portland cement as a primary binder for building products. In addition to conserving the natural resources and recycling the wastes, a potential carbon sink for the steel industry can be realized through its use.
High-strength KOBM steel slag binder activated by carbonation
Highlights Carbonation-activated steel slag can create a 2h strength of 80MPa and 28-day strength of 109MPa. The early strength is attributed to the carbonation of γ-C2S. The late strength is due to the hydration of β-C2S. Carbon-activated steel slag can be used as a green cementing binder to replace OPC.
Abstract The feasibility of developing a high strength KOBM (Klockner Oxygen Blown Maxhutte) steel slag binder activated by carbonation as an alternative cementing material was investigated. After two-hour carbonation reaction, steel slag compacts displayed a 2h compressive strength of 80MPa with a CO2 uptake of 13%. Early strength gain was attributed to the carbonation of the slag’s γ-C2S component. Subsequent hydration enhanced the ultimate strength to 109MPa, owing to the latent hydraulic reactivity of the β-C2S component. The carbon-activated slag presented a more sustainable alternative to Portland cement as a primary binder for building products. In addition to conserving the natural resources and recycling the wastes, a potential carbon sink for the steel industry can be realized through its use.
High-strength KOBM steel slag binder activated by carbonation
Ghouleh, Zaid (author) / Guthrie, Rodrick I.L. (author) / Shao, Yixin (author)
Construction and Building Materials ; 99 ; 175-183
2015-09-19
9 pages
Article (Journal)
Electronic Resource
English
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