Abstract
This study presents a numerical simulation of the mini-slump flow test performed on the Haegerman table, according to EN 1015-3. The two-dimensional axisymmetrical Volume of fluid (VOF) model is used for the calculation. Various scenarios with the different model set up and boundary conditions were calculated to show how the results are affected. Simulations with different lifting velocities were carried out and compared to the case with instantaneous demolding, which is commonly used in numerical simulations. Also, the effect on results is shown between noslip and specific shear boundary conditions on the mold. The results of simulations indicate that mold lifting should be considered in numerical modeling even if calculation time is highly prolonged. Lifting velocities should not exceed the value of 0.2 m/s in order to maintain laminar flow and stablecalculation.
Highlights
Concrete is a mixture of cement, fine, coarse aggregate, admixtures, and water
The results suggest the mold lifting velocity has a significant influence on the final slump spread
The present work provides a general study of setting up a numerical model of slump flow test and shows how different boundary conditions could affect the results
Summary
Concrete is a mixture of cement, fine, coarse aggregate, admixtures, and water. After mixing initial components with water, a fluid suitable for filling formwork is created. The most commonly used is the cone slump testing for its feasibility and reproducibility on in-situ and ex-situ conditions. Most of the studies modeled the slump-test with instantaneous demolding [2,3,4]. Such a boundary condition (b.c.) is leading to a higher slump spread. This behavior is artificially correlated by changing constants of the material model. The setting up of a numerical model of the mini-cone slump test is shown. The effect of different boundary conditions on the final slump spread
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