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Rheological properties of cement paste with nano-Fe3O4 under magnetic field : flow curve and nanoparticle agglomeration

Dengwu Jiao (UGent) , Karel Lesage (UGent) , Mert Yücel Yardimci (UGent) , Khadija El Cheikh (UGent) , Caijun Shi and Geert De Schutter (UGent)
(2020) MATERIALS. 13(22).
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Abstract
Understanding the influence of magnetic fields on the rheological behavior of flowing cement paste is of great importance to achieve active rheology control during concrete pumping. In this study, the rheological properties of cementitious paste with water-to-cement (w/c) ratio of 0.4 and nano-Fe3O4 content of 3% are first measured under magnetic field. Experimental results show that the shear stress of the cementitious paste under an external magnetic field of 0.5 T is lower than that obtained without magnetic field. After the rheological test, obvious nanoparticle agglomeration and bleeding are observed on the interface between the cementitious paste and the upper rotating plate, and results indicate that this behavior is induced by the high magnetic field strength and high-rate shearing. Subsequently, the hypothesis about the underlying mechanisms of nanoparticles migration in cementitious paste is illustrated. The distribution of the nanoparticles in the cementitious paste between parallel plates is examined by the magnetic properties of the powder as determined by a vibrating sample magnetometer. It is revealed that the magnetization of cementitious powders at different sections and layers provides a solid verification of the hypothesis.
Keywords
CONCRETE, PERFORMANCE, MIGRATION, MODEL, cement paste, rheology, nano-Fe3O4, magnetic field, parallel plate

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MLA
Jiao, Dengwu, et al. “Rheological Properties of Cement Paste with Nano-Fe3O4 under Magnetic Field : Flow Curve and Nanoparticle Agglomeration.” MATERIALS, vol. 13, no. 22, 2020, doi:10.3390/ma13225164.
APA
Jiao, D., Lesage, K., Yardimci, M. Y., El Cheikh, K., Shi, C., & De Schutter, G. (2020). Rheological properties of cement paste with nano-Fe3O4 under magnetic field : flow curve and nanoparticle agglomeration. MATERIALS, 13(22). https://doi.org/10.3390/ma13225164
Chicago author-date
Jiao, Dengwu, Karel Lesage, Mert Yücel Yardimci, Khadija El Cheikh, Caijun Shi, and Geert De Schutter. 2020. “Rheological Properties of Cement Paste with Nano-Fe3O4 under Magnetic Field : Flow Curve and Nanoparticle Agglomeration.” MATERIALS 13 (22). https://doi.org/10.3390/ma13225164.
Chicago author-date (all authors)
Jiao, Dengwu, Karel Lesage, Mert Yücel Yardimci, Khadija El Cheikh, Caijun Shi, and Geert De Schutter. 2020. “Rheological Properties of Cement Paste with Nano-Fe3O4 under Magnetic Field : Flow Curve and Nanoparticle Agglomeration.” MATERIALS 13 (22). doi:10.3390/ma13225164.
Vancouver
1.
Jiao D, Lesage K, Yardimci MY, El Cheikh K, Shi C, De Schutter G. Rheological properties of cement paste with nano-Fe3O4 under magnetic field : flow curve and nanoparticle agglomeration. MATERIALS. 2020;13(22).
IEEE
[1]
D. Jiao, K. Lesage, M. Y. Yardimci, K. El Cheikh, C. Shi, and G. De Schutter, “Rheological properties of cement paste with nano-Fe3O4 under magnetic field : flow curve and nanoparticle agglomeration,” MATERIALS, vol. 13, no. 22, 2020.
@article{8688217,
  abstract     = {{Understanding the influence of magnetic fields on the rheological behavior of flowing cement paste is of great importance to achieve active rheology control during concrete pumping. In this study, the rheological properties of cementitious paste with water-to-cement (w/c) ratio of 0.4 and nano-Fe3O4 content of 3% are first measured under magnetic field. Experimental results show that the shear stress of the cementitious paste under an external magnetic field of 0.5 T is lower than that obtained without magnetic field. After the rheological test, obvious nanoparticle agglomeration and bleeding are observed on the interface between the cementitious paste and the upper rotating plate, and results indicate that this behavior is induced by the high magnetic field strength and high-rate shearing. Subsequently, the hypothesis about the underlying mechanisms of nanoparticles migration in cementitious paste is illustrated. The distribution of the nanoparticles in the cementitious paste between parallel plates is examined by the magnetic properties of the powder as determined by a vibrating sample magnetometer. It is revealed that the magnetization of cementitious powders at different sections and layers provides a solid verification of the hypothesis.}},
  articleno    = {{5164}},
  author       = {{Jiao, Dengwu and Lesage, Karel and Yardimci, Mert Yücel and El Cheikh, Khadija and Shi, Caijun and De Schutter, Geert}},
  issn         = {{1996-1944}},
  journal      = {{MATERIALS}},
  keywords     = {{CONCRETE,PERFORMANCE,MIGRATION,MODEL,cement paste,rheology,nano-Fe3O4,magnetic field,parallel plate}},
  language     = {{eng}},
  number       = {{22}},
  pages        = {{15}},
  title        = {{Rheological properties of cement paste with nano-Fe3O4 under magnetic field : flow curve and nanoparticle agglomeration}},
  url          = {{http://dx.doi.org/10.3390/ma13225164}},
  volume       = {{13}},
  year         = {{2020}},
}

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