Magnetorheological properties of calcium aluminate cements
Materials and Structures/Materiaux et Constructions, cilt.59, sa.8, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 59 Sayı: 8
- Basım Tarihi: 2026
- Doi Numarası: 10.1617/s11527-026-03286-z
- Dergi Adı: Materials and Structures/Materiaux et Constructions
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, ICONDA Bibliographic, INSPEC, DIALNET, The International Construction Database (ICONDA), Materials Science & Engineering Collection (ProQuest), Technology Collection (ProQuest)
- Anahtar Kelimeler: Calcium aluminate cement, Magnetic field, Magneto-rheology, Rheology control, Storage modulus
- Dokuz Eylül Üniversitesi Adresli: Evet
Özet
The rheological properties of materials exhibiting magnetorheological (MR) behavior can be controlled on-demand through the application of a magnetic field during flow. Conventional Portland cement (PC) systems require the addition of extra magnetic particles to exhibit MR properties. In contrast, high-iron calcium aluminate cement (HI-CAC) is a binder that naturally exhibits MR properties. This study is the first to investigate the origin of the intrinsic MR properties of HI-CAC by analyzing the mineralogical and microstructural characteristics of its magnetic phases. The MR behavior of HI-CAC pastes with two different water-to-cement (w/c) ratios was assessed using oscillatory and rotational rheometry with a specialized MR device. To characterize its magnetic phases, a sequential magnetic separation was performed, and the bulk-HI-CAC and its separated fractions were analyzed by a vibrating-sample magnetometer (VSM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). Magnetic separation experiments showed that approximately 70% of the bulk HI-CAC responds even at 0.05 T, increasing to around 90% at 0.4 T. XRD and SEM–EDS analyses confirmed that magnetic properties originate from iron-bearing phases within the polymineralic structure of HI-CAC. Rheological tests demonstrated rapid manipulation of the viscoelastic and flow behaviors of HI-CAC pastes by an external magnetic field, indicating clear MR properties. The MR response depends strongly on the applied magnetic field strength and the w/c ratio. Comparisons with published data for PC-based MR mixtures at the same field strengths showed that the MR capacity of HI-CAC was substantially better than that of fly ash and fayalite slag incorporated PCs and comparable to nano-magnetite incorporated PC systems.