Abstract
Pseudo-strain-hardening behaviour under direct tensile loading in short fibre reinforced cement composites designed with quantitative guidance from micromechanics has been demonstrated experimentally, and conditions for the ductile behaviour of such engineered cementitious composites (ECC) have been formulated theoretically. In this paper special focus is placed on the influence of matrix properties on composite pseudo-strain-hardening. An experimental program is undertaken to study the dependence of the matrix properties on its mix compositions governed by water/cement and the sand/cement ratios. The theoretical and experimental knowledge thus obtained are combined to propose an innovative procedure for the design of composites using different types of matrix. The study is motivated by the need to develop a new class of ECCs with improved elastic modulus by the addition of fine aggregates to the cementitious matrix. Finally, a new composite is designed, and shown experimentally to exhibit the desirable features of pseudo-strain-hardening behaviour and improved elastic modulus.
Résumé
Au cours de ces dernières années, on a démontré de façon expérimentale le comportement de pseudo-écrouissage sous charge en traction directe de composites cimentaires renforcés de fibres courtes calculés à l'aide des données quantitatives de la micromécanique. Les conditions déterminant le comportement ductile de ces composites (ECC) ont été formulées de façon théorique. Dans cet article, on insiste particulièrement sur l'influence des propriétés de la matrice sur le pseudo-écrouissage du composite. On a entrepris un programme d'essais dans le but de déterminer l'influence de la composition des mélanges régis par les rapports eau/ciment et sable/ciment sur les propriétés de la matrice. La combinaison des savoirs théorique et expérimental ainsi obtenus permet de proposer une procédure innovante concernant le calcul des composites avec différents types de matrice. Cette étude résulte de la nécessité de mettre au point une nouvelle classe d'ECC présentant un module d'élasticité amélioré par l'addition de granulats fins à la matrice cimentaire. Enfin, on calcule un nouveau composite dont les essais montrent qu'il présente les caractéristiques souhaitables de comportement au pseudo-écrouissage et d'amélioration du module d'élasticité.
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References
Aveston, J., Cooper, G. A. and Kelly, A., ‘Single and multiple fracture’, in Properties of Fiber Composites’ (IPC Science and Technology Press Ltd., Guildford, UK, 1971) pp. 15–24.
Li, V. C. and Wu, H. C., ‘Conditions for pseudo strainhardening in fiber reinforced brittle matrix composites’,Appl. Mechn. Rev. 45 (1992) 390–398.
Li, V. C. and Leung, C. K. Y., ‘Theory of steady state and multiple cracking of random discontinuous fiber reinforced brittle matrix composites’,ASCE J. Engng Mech.,118 (1992) 2246–2264.
Li, V. C., From micromechanics to structural engineering— The design of cementitious composites for civil engineering application’,J. Struct. Mech. Earthquake Engng 10 (1993) 37–48.
Li, V. C., Wang, Y. and Backer, S., ‘Effect of inclining angle, bundling, and surface treatment on synthetic fiber pull-out from a cement matrix’,Composites 21 (1990) 132–140.
Li, V. C., ‘Post crack scaling relations for fiber reinforced cementitious composites’,ASCE J. Mater. Civil Engng 4(1992) 41–57.
Budiansky, B. and Cui, Y. L. ‘On the tensile strength of a fiber-reinforced ceramic composite containing a crack-like flaw’,J. Mech. Phys. Solids 42 (1994) 1–19.
Li, V. C., Wu, H. C. and Chan, Y. W., ‘Interfacial property tailoring for pseudo strain-hardening cementitious composites’, in ‘Advanced Technology on Design and Fabrication of Composite Materials and Structures’, edited by Carpinteri and Sih (Kluwer, Dordrecht, 1995) pp. 261–268.
Naus, D. J. and Lott, J. L., ‘Fracture toughness of Portland cement concretes’,J. Amer. Concr. Inst. 66 (1969) 481–489.
Higgins, D. D. and Bailey, J. E., ‘Fracture measurement on cement paste’,J. Mater Sci. 11 (1976) 1995–2003.
Hirsch, T. J., ‘Modulus of elasticity of concrete affected by elastic moduli of cement paste matrix and aggregate’,J. Amer. Concr. Inst 59 (1962) 427–451.
Li, V. C., Wu, H. C., Maalej, M. M., Mishra, D. K. and Hashida, T., Tensile behavior of engineered cementitious composites with discontinuous random steel fibers’,J. Amer. Ceram. Soc. (1995), in press.
Hillerborg, A., ‘Analysis of one single crack’, in ‘Fracture Mechanics of Concrete’, edited by F. H. Wittmann (Elsevier, Amsterdam, 1983) pp. 223–249.
Li, V. C. and Liang, E., ‘Fracture processes in concrete and fiber reinforced cementitious composites’,J. Engng Mech. 112 (1986) 566–586.
Hasin, Z., ‘The elastic moduli of heterogeneous material’,J. Appl. Mech. Trans. ASME 29 (1962) 143–150.
Lide, D. R., ‘CRC Handbook of Chemistry and Physics’ (CRC Press, Boca Raton, 1991).
Li, V. C. and Mishra, D. K., ‘Micromechanics of fiber effect on the uniaxial compressive strength of cementitious composites’, in ‘Fiber Reinforced Cement and Concrete’, Proceedings of the 4th RILEM International Symposium, Sheffield, U.K., edited by R. N. Swamy (1992) pp. 400–414.
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Li, V.C., Mishra, D.K. & Wu, HC. Matrix design for pseudo-strain-hardening fibre reinforced cementitious composites. Materials and Structures 28, 586–595 (1995). https://doi.org/10.1007/BF02473191
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DOI: https://doi.org/10.1007/BF02473191