EFFECTS OF EXTERNAL MAGNETIC FIELD ON STRUCTURAL EVOLUTION OF CEMENT PASTE WITH NANO-FE3O4

Author(s): Dengwu Jiao, Caijun Shi, Karel Lesage, Khadija El Cheikh and Geert De Schutter
Paper category: Proceedings
Book title: Proceedings of the 2nd International Conference on UHPC Materials and Structures (UHPC2018-China)
Editor(s): Caijun Shi and Baochun Chen
ISBN: 978-2-35158-219-0
e-ISBN: 978-2-35158-220-6
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 368-372
Total Pages: 5
Language : English

Abstract: Pumping and formwork casting are indispensable processes of modern engineering
applications of high performance concrete. However, there always exists a contradiction in
the requirements of structuration rate of fresh concrete during the pumping and casting
operations. For the same concrete mixture, actively controlling the rheology and stiffness of
fresh concrete by applying external magnetic fields would be a potential solution for the
contradicting requirements. In this paper, the structural evolution of cementitious paste
containing nano-Fe3O4 particles under various external magnetic fields are illustrated. Under
magnetic fields with high magnetic flux densities, the viscous-liquid behavior dominated the
elastic-solid behavior at the first few seconds, while the solid-like behavior became more
dominant with elapsed time. Higher magnetic field strengths resulted in higher percolation
time and lower phase angle at equilibrium state.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00