Flexural Strength of Fiber Cementitious Composites
Publication: Journal of Materials in Civil Engineering
Volume 6, Issue 3
Abstract
An analytical model has been developed for the flexural strength of fiber‐reinforced cement‐based materials. The proposed model adopts the fictitious crack concept to relate the flexural strength of these fiber composites to their tension‐softening properties and to specimen geometry. For the case of a cementitious matrix reinforced with discontinuous randomly distributed fibers, the flexural strength can be related to the micromechanical parameters and specimen geometry. A reasonable agreement has been observed between the model prediction and experimental data reported in literature, supporting the validity of the proposed model. This model led to conclude that the flexural strength of fiber cementitious composites is dependent on specimen geometry and is also strongly influenced by the stress acting across the process zone. In addition, the flexural strength is always higher than the tensile strength and it is reached when the fracture process zone is only partially developed. The model can be used to design fiber cementitious composites for optimum flexural strength.
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References
1.
Bažant, Z. (1992). “Should design codes consider fracture mechanics size effect?” Concrete Design Based on Fracture Mechanics, ACI SP‐134, American Concrete Institute, Detroit, Mich., 1–24.
2.
Gustafsson, P. J. (1985). “Fracture mechanics studies of nonyielding materials like concrete.” Rep. TVBM‐1007, Division of Building Materials, University of Lund, Sweden.
3.
Hillerborg, A. (1986). “Determination and significance of the fracture toughness of steel fiber concrete.” Steel fiber concrete (U.S.‐Sweden joint seminar, 1985), S. P. Shah and A. Skarendahl, eds., Stockholm/Elsevier Applied Science Publishers, England, London, 257–271.
4.
Hillerborg, A., Modéer, M., and Petersson, P. E. (1976). “Analysis of crack formation and crack growth in concrete by means of fracture mechanics and finite elements.” Cement and Concrete Res., 6(6), 773–782.
5.
Johnston, D. (1982). “Steel fiber reinforced and plain concrete: Factors influencing flexural strength measurement.” ACI J., Proc., 79(2), 131–138.
6.
Li, V. C. (1992). “Postcrack scaling relations for fiber reinforced cementitious composites.” J. Materials in Civ. Engrg., 4(1), 41–57.
7.
Li, V. C., Wang, Y., and Backer, S. (1990). “Effect of inclining angle, bundling and surface treatment on synthetic fibre pull‐out from a cement matrix.” J. Composites, 21(2), 132–140.
8.
Li, V. C., Wang, Y., and Backer, S. (1991). “A micromechanical model of tension softening and bridging toughening of short random fiber reinforced brittle matrix composites.” J. Mech. Physical Solids, 39(5), 607–625.
9.
Tada, H., Paris, P. C., and Irwin, G. R. (1985). Stress analysis of cracks handbook. Del Research Corp., Hellertown, Pa.
10.
Torrent, R. J., and Brooks, J. J. (1985). “Application of the highly stressed volume approach to correlated results from different tensile tests of concrete.” Mag. of Concrete Res., London, England, 37(132), 175–184.
11.
Wang, Y. (1989). “Mechanics of fiber cementitious composites,” PhD thesis, Massachusetts Institute of Technology, Cambridge, Mass.
12.
Wang, Y., Li, V. C., and Backer, S. (1991). “Tensile failure mechanisms in synthetic fiber‐reinforced mortar.” J. Mat. Sci., 26(24), 6565–6575.
13.
Ward, R., and Li, V. C. (1990). “Dependence of flexural behavior of fiber reinforced mortar on material fracture resistance and beam size.” J. Mat., 87(6), 627–637.
14.
Zhu, Y. (1990). “The flexural strength function for concrete beams without initial cracks.” Proc., 8th European Congress of Fracture: Fracture Behavior and Design of Mat. and Struct.; Vol. II, D. Firrao, ed., Chameleon Press Ltd., London, England, 599–604.
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Information
Published In
Journal of Materials in Civil Engineering
Volume 6 • Issue 3 • August 1994
Pages: 390 - 406
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: May 17, 1993
Published online: Aug 1, 1994
Published in print: Aug 1994
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