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Civil-Comp Proceedings
ISSN 1759-3433 CCP: 77
PROCEEDINGS OF THE NINTH INTERNATIONAL CONFERENCE ON CIVIL AND STRUCTURAL ENGINEERING COMPUTING Edited by: B.H.V. Topping
Paper 61
Flowable Concrete: Three-Dimensional Quantitative Simulation and Applications M.A. Noor+ and T. Uomoto*
+Department of Civil Engineering, Bangladesh University of Engineering and Technology, Bangladesh
Full Bibliographic Reference for this paper
M.A. Noor, T. Uomoto, "Flowable Concrete: Three-Dimensional Quantitative Simulation and Applications", in B.H.V. Topping, (Editor), "Proceedings of the Ninth International Conference on Civil and Structural Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 61, 2003. doi:10.4203/ccp.77.61
Keywords: flowable concrete, Bingham model, rheology, simulation, distinct element model, three-dimension.
Summary
Flowable concrete, requiring no consolidation work in site,
developed to improve the reliability of concrete and concrete structures. A
large amount of experimental effort can be avoided if a numerical approach
can predict the behavior of flowable concrete with reasonable preciseness. To
perform the simulation of this type of concrete some method should be there
to relate simulation parameter with the concrete parameters, such as Bingham
parameters. Three-dimensional distinct element model (henceforth
DEM) [1] was used, as a new tool here, to simulate behaviors
of this type of concrete under various states. In this paper, first effort
has been made to correlate and verify the Distinct Element Model parameters
of the mortar and concrete simulation to the Bingham coefficients of high
flow mortar and concrete. Here, Bingham coefficients mean yield value
(
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DEM parameters for mortar and concrete mean viscosity (
Then, some applications based on the developed model have been simulated to show that the model can be applied in all practical cases. These applications have been chosen carefully -- so that it can cover a broad range of problems. Several applications could be performed but, if the critical applications can be simulated using the proposed model, any application can be simulated. It is beyond the scope of the current research, to cover all possible applications currently available. Two classes applications were selected. One has relation to the flow of concrete and another has relation to the blocking and segregation of concrete. Both of these are important in practical problems. Other types of application were selected to show the scalability and applicability of the model. To demonstrate the flow related problem, slump flow test has been selected. To demonstrate, that concrete can fill all places of a complicated formwork, a T-Beam has been selected. A frame packed with reinforcement was selected, to show both flow and blocking related problem. L-box was selected to show the blocking and aggregate segregation related problem. Some general test methods were selected to demonstrate the diversification in the application simulation. These are -- a coaxial cylinder rheometer test, mainly to show the velocity profile distribution inside the concrete during rotation. It is found that, the DEM model proposed in this research can be used for simulation of flowable concrete. References
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