Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Preparation of mine backfilling from steel slag-based non-clinker combined with ultra-fine tailing
Highlights Ultra-fine tailing cementitious activity index increased from 0.49 to 0.71 by grinding. Mine backfilling requirements were met with a slurry concentration of 78%. The hydration products formed in the G3 sample greatly improved its strength. C − S − H and C−(A)S − H gel augmentation increased less harmful pores from 17.4 to 66.4%. Extended curing time (3 to 28 days) improved strength due to C − S − H and C−(A)S − H gels.
Abstract This study explores the influence of mechanical activation on the cementitious activity of ultra-fine tailing and the filling performance and hydration mechanisms of a clinker-free backfilling body. A binder with 50% granulated blast furnace slag, 35% steel slag and 15% desulfurisation gypsum, a binder to tailing ratio of 1:4, and a slurry concentration of 78% resulted in strength values of 6.69 MPa, 12.05 MPa, 16.36 MPa and 18.37 MPa after 3, 7, 28 and 180 days, respectively. Ettringite formed during metallurgical slag hydration and C-(A)S-H gels formed by superfine tailings under alkali activation resulted in the high compressive strength.
Preparation of mine backfilling from steel slag-based non-clinker combined with ultra-fine tailing
Highlights Ultra-fine tailing cementitious activity index increased from 0.49 to 0.71 by grinding. Mine backfilling requirements were met with a slurry concentration of 78%. The hydration products formed in the G3 sample greatly improved its strength. C − S − H and C−(A)S − H gel augmentation increased less harmful pores from 17.4 to 66.4%. Extended curing time (3 to 28 days) improved strength due to C − S − H and C−(A)S − H gels.
Abstract This study explores the influence of mechanical activation on the cementitious activity of ultra-fine tailing and the filling performance and hydration mechanisms of a clinker-free backfilling body. A binder with 50% granulated blast furnace slag, 35% steel slag and 15% desulfurisation gypsum, a binder to tailing ratio of 1:4, and a slurry concentration of 78% resulted in strength values of 6.69 MPa, 12.05 MPa, 16.36 MPa and 18.37 MPa after 3, 7, 28 and 180 days, respectively. Ettringite formed during metallurgical slag hydration and C-(A)S-H gels formed by superfine tailings under alkali activation resulted in the high compressive strength.
Preparation of mine backfilling from steel slag-based non-clinker combined with ultra-fine tailing
Zhang, Minggen (Autor:in) / Li, Keqing (Autor:in) / Ni, Wen (Autor:in) / Zhang, Siqi (Autor:in) / Liu, Zhengyu (Autor:in) / Wang, Kun (Autor:in) / Wei, Xinlei (Autor:in) / Yu, Yang (Autor:in)
25.12.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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