Numerical simulation of fresh concrete using discrete element method (DEM)
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Date
2019-06
Authors
Muhammad Syazwan Bin Talib
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Abstract
Fresh concrete is described as an assembly of composite particles made of
spherical hard grains representing coarse aggregates surrounded by concentric spherical
layers representing mortar. Concrete are most often modelled as so-called Bingham
materials. Hence, a rheological behaviour of fresh concrete can be described reasonably
well by Bingham Model. The shearing behaviour of a Bingham material can be
represented by a dashpot, a spring, and a slip function. In this study, Discrete Element
Method is used to simulate the behaviour of fresh concrete. Discrete Element Method
(DEM) enables the modelling of the movement (translation and rotation) of particles,
including their interactions between the particle itself and the interaction of particle and
wall. The parameters can be used directly in numerical simulations by means of the
Discrete Element Method (DEM). For the sake of validation, the analytical and numerical
predictions of the final shape of the concrete in the slump-flow test are compared. The
simulation is performed with four cases with different value of soft-shells yield stress
𝜏𝑜,𝑚 and soft-shells viscosity 𝜇𝑚. Results of numerical flow simulations for ASTM
Abrams cone slump are presented. These results are compared to experimental results in
in order to verify and validate the proposed numerical method and the chosen boundary
conditions.