Numerical modeling—A new tool for understanding shotcrete

Abstract

The analytical flow simulation of flesh concrete is a recent challenge to researchers. Due to its heterogeneity, the concrete mix shows neither a perfectly viscous nor perfectly particulate behavior. However, the particulate behavior of fresh concrete flow like arching and blocking in pipes and in complex boundary conditions, is very common. This is further magnified due to high pressure in the case ofshotcreting. For the first time in shotcrete research, authors propose the application of the Distinct Element Method [1] (DEM) to predict particle behavior and amount of rebound loss, and to assess the quality of the shotcrete analytically, Also, the effect of an accelerating agent, the way its effect is modeled, effects of gradual change in shooting pressure, the resulting rebound is shown. The void of the attached concrete is also compared with that of normal cast concrete in an analytical way. RI~SU MI ~

Discrete element modelling of the fresh state behavior of pervious concrete

“…presents the comparison between the experimental results by Shyshko et al[17] and the results obtained numerically with the proposed constitutive law. Despite the significant change in the velocity of the displacement applied in the test and the consequent modification in the load-strain curve, a good fit is obtained between the model and the experiments without the need of any additional calibration of parameters.…”

“…Studies from other authors [16][17][18][19][20] showed that the motion of the fresh pervious concrete in the normal direction has elastic and viscous components working simultaneously. The Kelvin-Voigt rheological model is generally used to represent this condition.…”

“…The authors considered a homogenous material approach in which all particles share the same properties. Afterwards, other studies [16][17] introduced a heterogeneous approach, using some particles to simulate the aggregates and others to simulate the cement paste or mortar. Nevertheless, with the advances in processing capabilities of modern computers, it becomes possible to use models with elevated complexity.…”

Numerical Study on Concrete Pumping Behavior via Local Flow Simulation with Discrete Element Method

“…Theoretical derivation also leads to formulas describing the inter-particle interactions due to van der Waals forces or liquid bridging [44,60,61]. The Bingham function is still used frequently while describing the contact behavior [62,63].…”

Modeling of Shotcrete Application for Use in a Real‐Time Training Simulator

“…Particles vary in size, from nanometers to coarse aggregates of more than 1 cm. Puri and Uomoto () used the discrete element method (DEM) (Cundall and Strack, ) to model fresh concrete as a two‐phase granular material, composed of gravel and mortar particles. They studied the effect of gradual changes in shooting pressure, the effect of an accelerating agent, and the resulting rebound.…”