Commenced in January 2007
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Internal Structure Formation in High Strength Fiber Concrete during Casting
Abstract:Post cracking behavior and load –bearing capacity of the steel fiber reinforced high-strength concrete (SFRHSC) are dependent on the number of fibers are crossing the weakest crack (bridged the crack) and their orientation to the crack surface. Filling the mould by SFRHSC, fibers are moving and rotating with the concrete matrix flow till the motion stops in each internal point of the concrete body. Filling the same mould from the different ends SFRHSC samples with the different internal structures (and different strength) can be obtained. Numerical flow simulations (using Newton and Bingham flow models) were realized, as well as single fiber planar motion and rotation numerical and experimental investigation (in viscous flow) was performed. X-ray pictures for prismatic samples were obtained and internal fiber positions and orientations were analyzed. Similarly fiber positions and orientations in cracked cross-section were recognized and were compared with numerically simulated. Structural SFRHSC fracture model was created based on single fiber pull-out laws, which were determined experimentally. Model predictions were validated by 15x15x60cm prisms 4 point bending tests.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1070605Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1115
 F. Laranjeira, S. Grunewald, J. Walraven, C. Blom, C. Molins and A. Aguado Characterization of the orientation profile of steel fibers reinforced concrete, Materials and Structures, Online 6 November 2010, pp.1-19.
 L.Ferrara, N.Tregger and S.P.Shah Flow-induced fibers orientation in SCSFRC: Monitoring and Prediction, In: Design, Production and Placement of Self-Consolidating Concrete, Proceedings of SCC2010, Montreal, September 26-29, 2010, pp.417-428.
 R. A. Krasnikovs& O. Kononova, Strength Prediction for Concrete Reinforced by Different Length and Shape Short Steel Fibers, Sc. Proceedings of RigaTechnicalUniversity. Transport and Engineering, 6, vol.31, 2009, pp.89-93.
 A.Krasnikovs, O.Kononova&A.Pupurs, Steel Fiber Reinforced Concrete Strength,Sc. Proceedings of RigaTechnicalUniversity. Transport and Engineering, 6, vol.28, Riga, 2008, pp. 142-150.
 P. Laure, L. Silva, T. Coupez and F. Toussaint, Numerical modeling of concrete flow with rigid fibers, In Cueto, E and Chinesta, F, editor, 10th ESAFORM Conference on Material Forming, Pts A and B, volume 907 of AIP CONFERENCE PROCEEDINGS, pp. 1390-1395, 2007. 10th ESAFORM Conference on Material Forming, Zaragoza, April 18-20, 2007.
 Advani, S. G. and C. L. Tucker III, The Use of Tensors to Describe and Predict Fiber Orientation in Short Fiber Composites, Journal of Rheology, 31:8, 751-784,
 Q.Zhang, J. Lin Orientation distribution and rheological properties of fiber suspensions flowing through curved expansion and rotating ducts, Journal of Hydrodynamics22(5), 2010, pp. 920-925.
 V.Lapsa and A.Krasnikovs Fiber reinforced concrete construction element production technology. Latvian patent LV12807 B, 2000, September 20.
 V.Lapsa, A.Krasnikovs, M.Eiduks, A.Pupurs Method for production the oriented fiberconcrete structures. Latvian patent LV 13929 B. 20.07.2010.
 M. Eiduks, A. Krasnikovs, E. Dunskis, O. Kononova. Investigation of Fiber Orientation in Viscous Fluid. Scientific Journal of RigaTechnicalUniversity. "Transport and engineering", 6, vol. 33, Riga 2010; pp. 98 - 102.
 K. Yasuda, T. Kyuto and N. Mori An experimental study of flowinduced fiber orientation and concentration distributions in a concentrated suspension flow through a slit channel containing a cylinder, Rheol Acta (2004) 43: pp.137-145.