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A theory for the creep of steel fibre reinforced cement matrices under compression

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Abstract

The paper presents a theoretical model to predict the creep of cement matrices reinforced with randomly oriented discrete steel fibres. The theory considers the composite to be represented by an aligned steel fibre which is surrounded by a thick cylinder of the cement matrix. The fibre provides restraint to the flow component of creep of the matrix through the fibre-matrix interfacial bond strength. The delayed elastic strain component of creep is unaffected by the fibre. The fibre-matrix interfacial bond strength,τ, is shown to be primarily a function of the shrinkage of the cement matrix and the radial deformation caused by the sustained axial stress. In addition, the state of stress in the matrix at the interface is suggested to influence greatly the bond strength,τ. The validity of the theory is established by means of experimental data on concrete and mortar matrices reinforced with melt extract and hooked steel fibres, at sustained stress-strength ratios of 0.3 and 0.55. Finally an empirical expression is derived to determine the creep of steel fibre reinforced concrete, based on a knowledge of the creep in unreinforced matrices and fibre size and volume fraction.

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References

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Authors and Affiliations

  1. Department of Engineering, University of Aberdeen, Marischal College, Aberdeen, UK

    P. S. Mangat & M. Motamedi Azari

Authors
  1. P. S. Mangat
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  2. M. Motamedi Azari
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Mangat, P.S., Motamedi Azari, M. A theory for the creep of steel fibre reinforced cement matrices under compression. J Mater Sci 20, 1119–1133 (1985). https://doi.org/10.1007/BF00585757

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  • DOI: https://doi.org/10.1007/BF00585757

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