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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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PURPOSES : In this paper, the flow of cement paste layers that were contoured at different times were simulated by computational fluid dynamics in 2D axisymmetric conditions to evaluate the effect of yield stress on the flow of cement paste layers. METHODS : In the 2D domain, the cylindrical-shaped bottom layer was placed on even ground and allowed to flow by gravitational force for only 25 s. The exact same shape of cement paste, the top layer, was placed on top of the bottom layer, and both layers were allowed to flow for an additional 25 s. The shape and pressure of both layers were evaluated. RESULTS : The relationship between the yield stress and diameter of the layer was clearly observed from the numerical simulation results. It was also observed that the interface between the top and bottom layers was affected by the yield stress and fluidity of materials. The total pressure underneath the bottom layer can be a good indicator of whether the material is still flowing or not. CONCLUSIONS:The Navier-Stokes equation with Bingham model is an excellent model to simulate the flow of contoured layers, which can be used to explain the flow of materials in various areas such as wet-on-wet pavement construction, structural member precasting, and 3D printing construction.
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참고문헌 (9)
참고문헌 신청
Coussot, P. / 1996 / Rheological Interpretation fo Deposits of Yield Stress Fluids / Jrnl. of Non- Newtonian Fluid Mech. 66:55~70
Mahmoodzadeh, F. / 2013 / Rheological Models for predicting palstic viscosity and yield stress of fresh concrete / Cement and Concrete Res. 49:1~9
Murata, J / 1984 / Flow and Deformation of Fresh concrete / Mater. Constr. 17:117~129
Petit, J. Y. / 2007 / Yield stress and viscosity equations for mortars and self-consolidating concrete / Cement and Concrete Res. 37:655~670
Roussel, N. / 2005 / Fifty-cent rheometer for Yield Stress Measurements: From Slump to Spreading Flow / Jrnl. of Rheology 49(3):705~718
Mahmoodzadeh, F. / 2013 / Rheological Models for predicting palstic viscosity and yield stress of fresh concrete / Cement and Concrete Res. 49:1~9
Murata, J / 1984 / Flow and Deformation of Fresh concrete / Mater. Constr. 17:117~129
Petit, J. Y. / 2007 / Yield stress and viscosity equations for mortars and self-consolidating concrete / Cement and Concrete Res. 37:655~670
Roussel, N. / 2005 / Fifty-cent rheometer for Yield Stress Measurements: From Slump to Spreading Flow / Jrnl. of Rheology 49(3):705~718
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