4.7 Article

Hydration and rheology of activated ultra-fine ground granulated blast furnace slag with carbide slag and anhydrous phosphogypsum

Journal

CEMENT & CONCRETE COMPOSITES
Volume 133, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2022.104727

Keywords

Blast furnace slag; Anhydrous phosphogypsum; Rheology; Hydration

Funding

  1. National Key Research and Development Program of China [2019YFC1907100]
  2. Natural Science Foundation of China [52008158]
  3. Major Technical Innovation Project in Hubei Province of China [2021BGD014, 2021BCA153]
  4. Depart-ment of Transport of Hubei Province, China [2020-186-1-10]

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This study systematically investigated the hydration and rheological behavior of ultra-fine ground granulated blast furnace slag (activated-BFS) with carbide slag and anhydrous phosphogypsum (AG) as combined activators. The results showed that the type of BFS played a limiting role in setting time, and their rheological behavior fitted with H-B model.
In this study, two different ultra-fine ground granulated blast furnace slag referred to as GS (i.e., by dry -winnowing method) and WS (i.e., by wet-grinding method) were obtained, and the hydration and rheology of activated ultra-fine ground granulated blast furnace slag (activated-BFS) with carbide slag and anhydrous phosphogypsum (AG) as combined activator were systematically investigated by means of setting time, work-ability, rheological behavior, compressive strength, autogenous shrinkage, electrical resistivity, SEM, XRD and TG-DTG. The results showed that the limiting factor is the BFS type, and not the AG dosage in terms of setting time, and their rheological behavior fitted with H-B model. WS and increase in AG dosage significantly reduced the plastic viscosity, shear stress and yield stress of activated-BFS pastes. The WS presented higher initial reaction activity that generated more hydrates in the early age, restricting the further hydration of BFS particles especially when AG dosage exceeded 10%, thus leading to the different compressive strength development trends between mixtures containing WS (WS/A) and GS (GS/A). The compressive strength of GS/A mixtures increased with increasing AG dosage and reached 39.9 MPa at 3 days, while WS/A first increased and then decreased. The activated-BFS with carbide slag and AG is technically feasible to be employed as cementitious materials in the production of concrete.

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