Ferro-vanadium Slag in Improving Inner Chloride Solidification Rate of Cement Materials

We investigated the effects of ferro-vanadium slag (FVS) as a supplemental cementing material which can dissolve a large amount of active aluminum phases without excessive pretreatment or excitation to enhance the inner chloride solidified rate (CSR) of cement-based materials. Cement-FVS pastes with...

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Bibliographic Details
Published in:Journal of Wuhan University of Technology. Materials science edition 2023-10, Vol.38 (5), p.1065-1076
Main Authors: Chen, Pian, Ma, Baoguo, Tan, Hongbo, Liu, Xiaohai
Format: Article
Language:English
Subjects:
Cement
Cementing
Cementitious Materials
Chemistry and Materials Science
Chloride
Chloride resistance
Compressive strength
Dosage
Hydrates
Hydration
Materials Science
Mechanical properties
NMR
Nuclear magnetic resonance
Pastes
Slag
Solidification
Thermogravimetric analysis
Vanadium
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Summary:We investigated the effects of ferro-vanadium slag (FVS) as a supplemental cementing material which can dissolve a large amount of active aluminum phases without excessive pretreatment or excitation to enhance the inner chloride solidified rate (CSR) of cement-based materials. Cement-FVS pastes with 0–30% content of FVS was designed, and the CSR was examined. Hydrates at different curing ages were studied by X-ray diffraction (XRD) and thermo-gravimetric analysis (TGA); hydration heat and 29 Si nuclear magnetic resonance ( 29 Si-NMR) were tested to analyze the hydration degree of the system; mechanical properties in cement-FVS system were evaluated by compressive strength test, pore structure and the fractal regression. Results revealed that the incorporation of FVS could greatly promote the CSR of cement-FVS system. Compared with the control groups, 30% dosage of FVS could increase the CSR by 69% at 3 d, 47% at 7 d, 36% at 28 d and 34% at 60 d. It was demonstrated that the incorporation of FVS could enhance the chemical solidifying ability of chloride, and the main reason was the promoted generation of Kuzel’s salt and the Friedel’s salt in hydrate products, and the enhanced chloride migration resistance capacity by increasing the volume of gel pores in the cement-FVS system. Considering the influence of FVS on strength performance, this paper suggested that the suitable dosage of FVS as a supplemental cementing material was around 10%. The study in this paper might provide one efficient path to promote the chloride solidifying capacity of cement-based material and meanwhile the comprehensive utilization of FVS.
ISSN:1000-2413
1993-0437
DOI:10.1007/s11595-023-2795-0