Numerical prediction of steel fiber orientation and distribution

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Monica Mosley
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1 Numerical prediction of steel fiber orientation and distribution Author: Oldřich Švec Supervisors: Henrik Stang John Forbes Olesen Lars Nyholm Thrane Three point bending test Source: internet 2 DTU Civil Engineering, Technical University of Denmark 1

and wider usage of SFRC-SCC 3 DTU Civil Engineering, Technical University of Denmark How do we do it?

2 What do we do? Part of a larger project Innovation consortium "Sustainable Concrete Structures using Steel Fiber Reinforced Concrete" (fund: Danish Strategic Research Council) Main task: to provide tools for better and wider usage of SFRC-SCC 3 DTU Civil Engineering, Technical University of Denmark How do we do it? We developed model capable of: Code, code, code, code Fluid Dynamics solver Non-Newtonian, Free Surface Boundary Conditions (walls, inlets, re-bars ) Solid particle model Fibers, Aggregates (spheres, ellipsoids ) Collisions and other interactions Parallelized (running on 25 cores and more) Further information in our journal paper: Free surface flow of a suspension of rigid particles in a non-newtonian fluid: A lattice Boltzmann approach Number of Files Lines Characters Eq. Pages DTU Civil Engineering, Technical University of Denmark 2

slump spread: 600 650 mm yield stress: 45 Pa, plastic viscosity: 75 Pa s SLAB CASTING (DTI, DENMARK) 5 DTU Civil

3 slump spread: mm yield stress: 45 Pa, plastic viscosity: 75 Pa s SLAB CASTING (DTI, DENMARK) 5 DTU Civil Engineering, Technical University of Denmark Computed Tomography 6 DTU Civil Engineering, Technical University of Denmark 3

4 Computed tomography results Bottom Third Top Third 7 DTU Civil Engineering, Technical University of Denmark Fiber orientation vs. fracture response Top Third 8 DTU Civil Engineering, Technical University of Denmark 4

5 Numerical Simulation 9 DTU Civil Engineering, Technical University of Denmark CT vs. Simulation Upper third of the slab 10 DTU Civil Engineering, Technical University of Denmark 5

6 Problem Simulation Lower third of the slab CT VS 11 DTU Civil Engineering, Technical University of Denmark Additional SLAB CASTING Collaboration between the SFRC-Consortium and the COIN project in Norway 12 DTU Civil Engineering, Technical University of Denmark 6

7 Mould surfaces 2 Slabs 2 Slabs Oiled laminated plywood Glued sand surface 13 DTU Civil Engineering, Technical University of Denmark Experiment vs. simulation 14 DTU Civil Engineering, Technical University of Denmark 7

F, kn F, kn Four point bending tests slippery surface Simulation 80 70 60 50 40 30 20 10 0 0,00

Denmark Four point bending tests rough surface Simulation 80 70 60 50 40 30 20 10 0 0,00 1,00

8 F, kn F, kn Four point bending tests slippery surface Simulation ,00 1,00 2,00 3,00 4,00 5,00 6,00 7,00 CMOD, mm 15 DTU Civil Engineering, Technical University of Denmark Four point bending tests rough surface Simulation ,00 1,00 2,00 3,00 4,00 5,00 6,00 7,00 8,00 CMOD, mm 16 DTU Civil Engineering, Technical University of Denmark 8

9 Conclusions Fibers orient due to the flow of the SCC Dependent on formwork type Knowledge of the casting process is required (rheology, type of filling, surface of the formwork ) We are able to predict the final orientation and distribution of fibers Future work: Relation between Fiber orientation (i.e. fiber counts at the fracture plane ) Final mechanical properties of the elements 17 DTU Civil Engineering, Technical University of Denmark Thank you for your attention Journal papers Journal of Non-Newtonian Fluid Mechanics: Free surface flow of a suspension of rigid particles in a non-newtonian fluid: A lattice Boltzmann approach, 2012 Conference papers CMM 2011: Fully coupled Lattice Boltzmann simulation of fiber reinforced self compacting concrete flow ICCC 2011: Flow simulation of fiber reinforced self compacting concrete using Lattice Boltzmann method ICCC 2011: Modeling of flow of flow of particles in non-newtonian fluid using lattice Boltzmann method BEFIB 2012: Fibre reinforced self-compacting concrete flow simulations in comparison with L- Box experiments using Carbopol SSCS 2012: Application of the fluid dynamics model to the field of fibre reinforced selfcompacting concrete Other Nordic symposium 2011: Prediction of flow induced inhomogeneities in self compacting concrete 18 DTU Civil Engineering, Technical University of Denmark 9

After reading this lesson you will be able to: 12.3 IMPORTANCE OF ROOF 12.4 TYPES OF ROOF IN A HOUSE

After reading this lesson you will be able to: 12.3 IMPORTANCE OF ROOF 12.4 TYPES OF ROOF IN A HOUSE 86 :: Certificate in Construction Supervision (CIVIL) 12 ROOF 12.1 INTRODUCTION The structure provided to cover the house surface (floor) is known as roof. For different situation and requirement, it is