Characterizing Rheology of Fresh Short Fiber Reinforced Cementitious Composite through Capillary Extrusion
Publication: Journal of Materials in Civil Engineering
Volume 17, Issue 1
Abstract
The rheology behavior of fresh short fiber reinforced cementitious composite (SFRCC) for extrusion purpose was investigated through capillary extrusion. It was found that the classical capillary theory for single-phase fluid was not appropriate to interpret the flow behavior of fresh SFRCC due to the large pressure loss occurring at the capillary entrance and the significant slip effect happening in the capillaries. By using a set of capillaries with the same diameter but different lengths, the true shear stress was derived on the basis of Bagley’s end correction while the slip effect was calibrated through a series of capillary extrusion tests with different capillary diameters. It was found that the slip velocity could be determined by the Jastrzebski model. Further studies showed that the intrinsic rheology behavior of fresh SFRCC could be modeled by the Herschel–Bulkley equation and the associated parameters could be determined through the experimental and the data interpretation method described in this paper. The fresh SFRCC flow in capillary extrusion was dominated by slip, and the velocity profile could be determined through a superposition of an internal shear flow with a plug flow. The slip layer thickness developed in the capillaries was also estimated based on the calibrated theory and experimental data.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgment
The financial support from Hong Kong Research Grant Council under Grant No. HKUST 6091/00E is gratefully acknowledged.
References
Adams, M. J., Briscoe, B. J., and Sinha, S. K. (1995). “Interfacial and bulk rheological characterizations of paste materials in extrusion flow.” Proc., Diversity into the Next Century, 27th International SAMPE Technical Conf., R. J. Martinez, ed., Regency, Albuquerque, N.M. 877–891.
Aldea, C., Marikunte, S., and Shah, S. P. (1998). “Extruded fiber reinforced cement pressure pipes.” Adv. Cem. Based Mater., 8(2), 47–55.
Bagley, E. B. (1957). “End correction in the capillary flow of polyethylene.” J. Appl. Phys., 28(5), 624–627.
Enzendorfer, C., Harris, R. A., Economides, M. J., Fokker, P. A., and Davies, D. D. (1995). “Pipe viscometry of foams.” J. Rheol., 39(2), 345–358.
Graczyk, J., Gonzalez-Alvarez, A., Arellano, M., and Buggisch, H. (2002). “Characterization of wall slip in extrusion of ceramic pastes.” Key Eng. Mater., 206–213, 321–324.
Hatzikiriakos, S. G., and Dealy, J. M. (1992). “Wall slip of molten high density polyethylenes. II. Capillary rheometer studies.” J. Rheol., 36(4), 703–741.
Jastrzebski, Z. D. (1967). “Entrance effects and wall effects in an extrusion rheometer during the flow of concentrated suspensions.” Ind. Eng. Chem. Fundam., 6, 445–453.
Khan, A. U., Briscoe, B. J., and Luckham, P. F. (2001). “Evaluation of slip on capillary extrusion of ceramic pastes.” J. Eur. Ceram. Soc., 21(4), 483–491.
Li, Z. J., Mu, B., and Chui, S. N. C. (1999). “Systematic study of properties of extrudates with incorporated metakaolin or silica fume.” ACI Mater. J., 96(5), 574–579.
Li, Z. J., Mu, B., and Chui, S. N. C. (2001). “Static and dynamic behavior of extruded sheets with short fibers.” J. Mater. Civ. Eng., 13(4), 248–254.
Macosko, C. W. (1994). Rheology: Principle, measurements, and applications, VCH, New York.
Mooney, M. (1931). “Explicit formulas for slip and fluidity.” J. Rheol., 2, 210–222.
Ozkan, N., Oysu, C., Briscoe, B. J., and Aydin, I. (1999). “Rheological analysis of ceramic pastes.” J. Eur. Ceram. Soc., 19(16), 2883–2891.
Peled, A., and Shah, S. P. (2003). “Processing effects in cementitious composites: Extrusion and casting.” J. Mater. Civ. Eng., 15(2), 192–199.
Shao, Y., Marikunte, S., and Shah, S. P. (1995). “Extruded fiber-reinforced composites.” Concr. Int., 17(4), 48–52.
Shao, Y., and Shah, S. P. (1996). “High performance fiber-cement composites by extrusion processing.” Materials for the New Millennium, Proc., 4th Materials Engineering Conf., K. P. Chong ed., Vol. 1, ASCE, Reston, Va., 251–260.
Shao, Y., and Shah, S. P. (1997). “Mechanical properties of PVA fiber reinforced cement composites fabricated by extrusion processing.” ACI Mater. J., 94(6), 555–564.
Shen, B. (2003). “Experimental approaches for determination rheological properties of cement-based extrudates.” Ms Philosophy thesis, the Hong Kong Univ. of Science and Technology, Hong Kong.
Stang, H., and Pederson, C. (1996). “HPFRCC-extruded pipes.” Materials for the New Millennium, Proc., 4th Materials Engineering Conf., K. P. Chong, ed., Vol. 1, ASCE, Reston, Va., 261–270.
Yilmazer, U., and Kalyon, D. M. (1989). “Slip effect in capillary and parallel disk torsional flows of highly filled suspensions.” J. Rheol., 33(8), 1197–1212.
Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 17 • Issue 1 • February 2005
Pages: 28 - 35
Copyright
© 2005 ASCE.
History
Received: May 13, 2003
Accepted: Mar 18, 2004
Published online: Feb 1, 2005
Published in print: Feb 2005
Notes
Note. Associate Editor: Kimberly E. Kurtis
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.