Abstract
Abstract In the numerical simulation of the macroscopic flow of the concrete, it can optimize the performance indicators of the screw conveyor and improve the uniformity of the material to be discharged in the batch production. The discrete element method is effective. The accuracy of physical parameters of this method is a key issue for the reliability of the simulation results of concrete. In this study, we measured the parameters describing the interaction between gravel, mortar, as well as between these two materials and the wall (steel). The experimentally determined parameters include the particle density, size, shape, coefficient of restitution, coefficients of static, and rolling friction. The cohesion coefficient of mortar particles for batch time was obtained by comparing the spread diameter and flow time in V-funnel experiments and simulation. After these calibration steps, the DEM parameters were validated by comparison of the mass flow rate and driving power by the batch production of screw conveying in simulations and experiments. The calculated results are proved to be close to the experimental data, which demonstrates that the measured DEM parameters are of sufficient accuracy to be used in the simulation of concrete flow performance (mass flow rate, energy consumption) in the screw conveyors.
Highlights
In the numerical simulation of the macroscopic flow of the concrete, it can optimize the performance indicators of the screw conveyor and improve the uniformity of the material to be discharged in the batch production
The “measured” discrete element method (DEM) parameters are validated by comparison of the mass flow rate of concrete by the batch production of screw conveying in simulations and experiments
The results showed that the physical parameters of mortar and gravel can accurately describe the flow performance of concrete in batch production
Summary
Abstract: In the numerical simulation of the macroscopic flow of the concrete, it can optimize the performance indicators of the screw conveyor and improve the uniformity of the material to be discharged in the batch production. The physical parameter measurement in a shorter time scale is difficult to reflect the effect of the batch production mode on the parameters of the concrete DEM model. Given the measurement of the physical parameters of the DEM model for concrete affected by time-dependence, it makes a systematic study for the measurement methods and results of gravel and mortar physical parameters. We first report the measurement methods and the results of determining the main physical parameters, such as particle shape, size, density, coefficient of restitution, and coefficient of static and rolling friction of gravel and mortar. The coefficient of rolling friction of gravel and the coefficient of cohesion of the mortar was calibrated by comparison of the macro parameters such as the angle of repose, flow time, and spread radius of the particles built-in experiments and in simulation. The “measured” DEM parameters are validated by comparison of the mass flow rate of concrete by the batch production of screw conveying in simulations and experiments
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