Modelling Fresh Concrete Flow through Reinforcing Bars with Computational Homogenization

2015 ◽  
Author(s):  
F. Kolarík ◽  
B. Patzák ◽  
J. Zeman
Keyword(s):  
Fresh Concrete ◽  
Computational Homogenization ◽  
Reinforcing Bars ◽  
Flow Through ◽  
Concrete Flow

scholarly journals Computational homogenization of fresh concrete flow around reinforcing bars

2018 ◽  
Vol 207 ◽  
pp. 37-49 ◽  
Author(s):  
F. Kolařík ◽  
B. Patzák ◽  
J. Zeman
Keyword(s):  
Fresh Concrete ◽  
Computational Homogenization ◽  
Reinforcing Bars ◽  
Concrete Flow

Numerical Modelling of Multiphase Flow With Application to Industrial Processes

2021 ◽  
Author(s):  
◽  
Ashutosh Bhokare
Keyword(s):  
Numerical Modelling ◽  
Multiphase Flow ◽  
Multiphase Flows ◽  
Oil And Gas ◽  
Fresh Concrete ◽  
Industrial Applications ◽  
Fluidised Bed ◽  
Bingham Model ◽  
Drag Models ◽  
Concrete Flow

Multiphase flows are witnessed often in nature and the industry. Simulating the behaviour of multiphase flows is of importance to scientists and engineers for better prediction of phenomena and design of products. This thesis aims to develop a multiphase flow framework which can be applied to industrial applications such as placement of concrete in construction and proppant transport in oil and gas. Techniques available in literature to model multiphase flows are systematically introduced and each of their merits and demerits are analysed. Their suitability for different applications and scenarios are established. The challenges surrounding the placement of fresh concrete in formwork is investigated. Construction defects, the physics behind these defects and existing tests used to monitor fresh concrete quality are evaluated. Methods used to simulate fresh concrete flow as an alternative to experiments are critically analysed. The potential benefits of using numerical modelling and the shortcoming of the existing approaches are established. It is found that the homogeneous Bingham model is currently the most widely used technique to model fresh concrete flow. Determining the Bingham parameters for a given concrete mix remains a challenge and a novel method to obtain values for them is demonstrated in this work. The Bingham model is also applied to a full-scale tremie concrete placement procedure in a pile. Knowledge on the flow pattern followed by concrete being placed using a tremie is extracted. This is used to answer questions which the industry currently demands. The need for a more sophisticated model is emphasised in order to obtain an even greater understanding of fresh concrete flow behaviour. A CFD-DEM framework in which the multiphase nature of concrete is captured is developed. To validate this framework a new benchmark test is proposed in conjunction with the fluidised bed experiment. A comparative study of the drag models used in CFD-DEM approaches is performed to systematically assess each of their performances. CFD-DEM modelling is then applied to model fresh concrete flow and its potential to model defect causing phenomena is demonstrated. A model to capture more complex behaviours of concrete such as thixotropy is introduced and demonstrated.

Simulation of fresh concrete flow using Discrete Element Method (DEM): theory and applications

2013 ◽  
Vol 47 (4) ◽  
pp. 615-630 ◽  
Author(s):  
Viktor Mechtcherine ◽  
Annika Gram ◽  
Knut Krenzer ◽  
Jörg-Henry Schwabe ◽  
Sergiy Shyshko ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Fresh Concrete ◽  
Discrete Element ◽  
Concrete Flow ◽  
Element Method

Study of fresh concrete flow curves

1980 ◽  
Vol 10 (2) ◽  
pp. 203-212 ◽  
Author(s):  
Velimir Ukrainčik
Keyword(s):  
Fresh Concrete ◽  
Flow Curves ◽  
Concrete Flow

scholarly journals Mechanical Properties of Fibre Reinforced Self Compacting Concrete using Rice Husk Ash

2019 ◽  
Vol 8 (3) ◽  
pp. 6412-6415 ◽  
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Rice Husk ◽  
Mechanical Characteristics ◽  
Rice Husk Ash ◽  
Fresh Concrete ◽  
Steel Fibers ◽  
Self Compacting Concrete ◽  
Flow Through ◽  
Water Curing

Self-compacting concrete (SCC) is relatively a recent development in the construction world. SCC can flow through dense reinforcement under its own weight without any segregation, bleeding, and vibration. The use of steel fibers is being encouraged to increase mechanical characteristics of SSC. However, adding fibers to fresh concrete results in loss of workability. Steel fibers operate as crack arrestors in concrete and extend the span of structures. In the present study, the mechanical properties of SCC with cement is partially replaced by rice husk ash (RHA) & P500 (ultra-fine fly ash). A total of 5 mixes with 0.3 W/C ratio were cast for 7, 28 and 56 days water curing. The replacement of fibres is considered as 0%, 0.5%, 1%, 1.5%, and 2% by weight of cement. Workability, Compressive, Split Tensile and Flexural strength is studied in this investigation. Superior strength was observed at optimum dosage of steel fibers at 1.5% by weight of cement

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