Rheological behavior of cement paste with nano-Fe₃O₄ under magnetic field: Magneto-rheological responses and conceptual calculations

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Jiao D., Lesage K., YARDIMCI M. Y., El Cheikh K., Shi C., De Schutter G.

CEMENT & CONCRETE COMPOSITES, cilt.120, 2021 (SCI-Expanded, Scopus)

• Yayın Türü: Makale / Tam Makale
• Cilt numarası: 120
• Basım Tarihi: 2021
• Doi Numarası: 10.1016/j.cemconcomp.2021.104035
• Dergi Adı: CEMENT & CONCRETE COMPOSITES
• Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, INSPEC, Metadex, Civil Engineering Abstracts
• Anahtar Kelimeler: Active rheology control (ARC), Active stiffening control (ASC), Structural build-up, Magnetic field, Nano-Fe3O4
• Dokuz Eylül Üniversitesi Adresli: Hayır

Özet

The magneto-rheological responses of cement paste with nano-Fe3O4 particles are experimentally investigated. The estimated magneto-dynamic force between two neighboring nanoparticles and equilibrium movement velocity of the nanoparticles in cement-based suspensions are calculated. Results show that the nanoparticles have a potential to move to form magnetic clusters when a magnetic field is applied, which creates a sort of agitation effect breaking down the early C-S-H links between cement particles, and thus the corresponding suspensions exhibit liquid-like behavior immediately after applying the magnetic field. The solid-like property of the studied suspensions becomes more dominant with magnetizing time due to the formation of magnetic clusters and the reconstruction of C-S-H bridges. The rheological properties of paste medium exert significant influences on the magneto-rheological responses of cement paste containing nano-Fe3O4 particles. It is revealed that the calculated magnetic yield parameter and nanoparticle movement velocity are useful relevant indicators to evaluate the magneto-rheological effect of cementitious paste.