Share This Article:

Mathematical Modelling in Placing of Fresh Concrete

Abstract Full-Text HTML Download Download as PDF (Size:789KB) PP. 195-202
DOI: 10.4236/eng.2011.33023    5,644 Downloads   10,885 Views   Citations
Author(s)    Leave a comment

ABSTRACT

The main problem in working with fresh concrete is the aggregate segregation during filling of formwork. The segregation is strongly related to W/C (Water/Cement) ratio. The fresh concrete is usually considered as a Non-Newtonian fluid since it is a mixture of aggregate, cement and water. The flow behavior of the fresh concrete to W/C ratio plays a crucial role in the quality of the high performance concretes by affecting the flow behavior of the fresh concrete. The aggregates in the fresh concrete usually cause segregation in the final product depending on the flow condition. In this study, the mechanism of segregation in such systems was theoretically investigated. The mould filling of fresh concrete was numerically investigated and aggregates were considered as Lagrangian particles and segregation was identified from trajectories of such particles. It was found that the aggregates were trapped at the dead zones leading to segregation in the system. The particle size and geometry of the mould was found to have significantly affect the segregation in the system.

Cite this paper

A. Bilgil, "Mathematical Modelling in Placing of Fresh Concrete," Engineering, Vol. 3 No. 3, 2011, pp. 195-202. doi: 10.4236/eng.2011.33023.

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1] M. Hoshino, “Relationships between Bleeding, Course Aggregate and Specimen Height Concrete,” ACI Materials Journal, Vol. 86 No. 2, 1989, pp. 228-234.
[2] K. H. Kayahat and Z. Guizani, “Use of Viscosity-Modi- fying Admixture to Enhance Stability of Fluid Concrete,” ACI Materials Journals, Vol. 94, No. 4, July 1997, pp. 332-340.
[3] T. Soshiroda, “Segregation Characteristics of Concrete Containing a High-Range Water-Reducing Admixture,” ACI Special Publication, Vol. 68, January 1981, pp. 121- 138.
[4] K. Bois, A. Benally and R. Zoughi, “Near-Field Microwave Scattering Analysis of Concrete Materials Using Open-Ended Waveguide at s- and x-Band,” SPIE Symposium on Nondestructive Evaluation Techniques for Aging Infrastructure Manufacturing, San Antonio, March 1998.
[5] A. M. Neville, “Properties of Concrete,” 4th Edition, John Wiley & Sons, Hoboken, 1996.
[6] F. C. Ferraris, “Measurement of Rheological Properties of High Performance Concrete: State of the Art Report,” Journal of Research of the National Institute of Standards and Technology, Vol. 104, No. 5, September-October 1999, pp. 461-478.
[7] N. Iwasaki., “Estimation of Workability-Why has the Sump Remained Being Used So Long?” Concrete Journal, Vol. 21, No. 10, 1983, pp. 4-12.
[8] G. H. Tattersall, “The Workability of Concrete,” A Viewpoint Publication, PCA, 1976.
[9] A. G. B. Ritchie, “The Triaxial Testing of Fresh Concrete,” Magazine of Concrete Research, Vol. 14, 1962, pp. 37-41
[10] L. J. Struble and X. J. Uang, “Handbook of Analytical Techniques in Concrete Science and Technology,” Noyes Publications Park Ridge, New Jersey, 2001, pp. 333-367
[11] F. de Larrard, F. C. Ferraris and T. Sedran, “Fresh Concrete: A Herschel-Bukley Material,” Material and Structures, Vol. 31, No. 7, 1998, pp. 494-498. doi:10.1007/BF02480474
[12] A. Bilgil, B. Oztürk and H. Bilgil, “A Numerical Approach to Determine Viscosity-Dependent Segregation in Fresh Concrete,” Applied Mathematics and Computation, Vol. 162, No. 1, 2005, pp. 225-241. doi:10.1016/j.amc.2003.12.086
[13] M. I. Safawi, I. Iwaki and T. Miura, “The Segregation Tendency in the Vibration of High Fluidity Concrete,” Cement and Concrete Research, Vol. 34, No. 2, February 2004, pp. 219-226. doi:10.1016/S0008-8846(03)00249-7
[14] I. Y. T. Ng, H. H. C. Wong and A. K. H. Kwan, “Passing Ability and Segregation Stability of Self-Consolidating Concrete with Different Aggregate Proportions,” Magazine of Concrete Research, Vol. 58, No. 7, 2006, pp. 447- 457. doi:10.1680/macr.2006.58.7.447
[15] Z. Li, “State of Workability Design Technology for Fresh Concrete in Japan,” Cement and Concrete Research, Vol. 37, No. 9, September 2007, pp. 1308-1320. doi:10.1016/j.cemconres.2007.05.001
[16] A. Leeman and F. Winnefeld, “The Effect of Viscosity Modifying Agents on Mortar and Concrete,” Cement and Concrete Composites, Vol. 29, No. 5, May 2007, pp. 341- 349. doi:10.1016/j.cemconcomp.2007.01.004
[17] D. P. Bentz, “Engineering Concrete Performance,” Concrete International, Vol. 29, No. 11, November 2007, pp. 33-37.
[18] N. Roussel, M. R. Geiker, F. Dufour, L. N. Thrane and P. Szabo, “Computational Modeling of Concrete ?ow: General Overview,” Cement and Concrete Research, Vol. 37, 2007, pp. 1298-1307. doi:10.1016/j.cemconres.2007.06.007
[19] B. Patzák and Z. Bittnar, “Modeling of Fresh Concrete ?ow,” Computers and Structures, Vol. 87, 2009, pp. 962-969. doi:10.1016/j.compstruc.2008.04.015
[20] S. Bethmont, L. D’Aloia Schwartzentruber, C. Stefani, J. L. Tailhan and P. Rossi, “Contribution of Granular Interactions to Self Compacting Concrete Stability: Development of a New Device,” Cement and Concrete Research, Vol. 39, No. 1, January 2009, pp. 30-35. doi:10.1016/j.cemconres.2008.10.007
[21] S. E. Chidiac and F. Mahmoodzadeh, “Plastic Viscosity of Fresh Concrete – A Critical Review of Predictions Methods,” Cement and Concrete Composites, Vol. 31, No. 8, September 2009, pp. 535-544. doi:10.1016/j.cemconcomp.2009.02.004
[22] F. C. Ferraris and F. de Larrard, “Testing and Modelling of Fresh Concrete Rheology,” NISTIR 6094, February 1998.
[23] F.C. Ferraris, F. de Larrard and N. Martys, “Fresh Concrete Rheology: Recent Developments,” Reprinted from Materials Science of Concrete VI, The American Ceramic Society, 735 Ceramic Place, Westerville, 2001, pp. 215-241.
[24] M. D. Mat, K. Alt?n???k, F. Karako? and Y. Kaplan, “Mathematical Modelling of Fractionation during the Mold Filling of Semi-Solid Metal Slurries,” Turkish Journal of Engineering and Environmental Sciences, 1999, pp. 281-288.
[25] N. A. Fueyo, I. Hamill and Q. Zhang, “The GENTRA User Guide,” CHAM Limited (UK) Technical Report, TR/211, 1992.
[26] R. Clift, J. R. Grace and M.E. Weber, “Bubbles, Drops and Particles,” Academic Press New York, 1978.
[27] H. Rosten and D.B. Spalding, “PHOENICS Beginner’s Guide and User’s Manual,” CHAM Limited (UK) Technical Report, TR/100, 1986.
[28] “An Introduction to CHAM, Its Software and Services,” 2011. Internet Available: http://www.cham.co.uk
[29] B. Van Leer, “Towards the Ultimate Conservative Difference Scheme, IV: A New Approach to Numerical Convection,” Journal of Computational Physics, Vol. 23, No. 3, March 1977, pp. 276-299. doi:10.1016/0021-9991(77)90095-X
[30] A. Bilgil and E. Ye?ilyurt, “Mathematical Modelling of Aggregate Segregation During Concrete flow,” 2nd International Symposium, European University of Lefke, 2002
[31] A. Bilgil and E. Ye?ilyurt, “Concrete Properties and Tests,” Erciyes University Press, Kayseri, 1999.
[32] J. Murata and H. Kikukawa, “Viscosity Equation for Fresh Concrete,” ACI Materials Journals, Vol. 89, No. 3, May 1992, pp. 230-237.

  
comments powered by Disqus

Copyright © 2020 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.