Abstract
In this paper, the microscopic approach was proposed to clarify the rheological behaviors of fresh concrete, which treats fresh concrete as a granular fluid with viscousness and inter-particle friction, and gets the shear deformation of fresh concrete by accumulating the particle motions in the shear direction. After investigating the probability of occurrence of moving particles, average particle contact angle, and average particle movement distance under shear stress, constitutive equations of fresh concrete before and after yielding were derived, and dynamic yield stress model, viscoelastic deformation model and viscoplastic flow model were obtained, respectively. The numerical calculations confirmed that these models can describe the complex rheological behaviors of fresh concrete presenting in the rheological experiments, including viscoelastic deformation before yielding, non-linearity of viscoplastic flow, shear thinning, and the dependence on normal stress and shear history.
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