EFFECTS OF EXTERNAL MAGNETIC FIELD ON STRUCTURAL EVOLUTION OF CEMENT PASTE WITH NANO-FE3O4
Pumping and formwork casting are indispensable processes of modem 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.
Cement paste Magnetic field Structural evolution Viscoelastic behavior
Dengwu Jiao Caijun Shi Karel Lesage Khadija El Cheikh Geert De Schutter
Key Laboratory for Green and Advanced Civil Engineering Materials and Application Technology of Huna Key Laboratory for Green and Advanced Civil Engineering Materials and Application Technology of Huna Magnel Laboratory for Concrete Research, Department of Structural Engineering, Ghent University, 905
国际会议
福州
英文
344-348
2018-11-07（万方平台首次上网日期，不代表论文的发表时间）