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Proposed classification of HPFRC composites based on their tensile response

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Abstract

The tensile response of fiber reinforced cement (FRC) composites can be generally classified in two distinct categories depending on their behavior after first cracking, namely, either strain-hardening or strain-softening. Within the strain-softening category, one can distinguish between deflection-hardening and deflection-softening behavior. Several standard tests (ASTM, JCI, RILEM) are available to assess the characteristics of mostly strain-softening FRC composites through bending tests, but no standard test is currently available to characterize strain-hardening response in tension. Such composites have been described as high performance FRC or HPFRC composites. In this paper a proposal is put forth to characterize the response of strain-hardening FRC composites based on the results of direct tensile tests. The classification is based on several parameters which include a minimum value of elastic modulus, a minimum value of peak strain after first cracking, and the tensile strength level. While one of the key obstacles remains, that is, to develop a realistic and meaningful tensile test standard, some requirements on minimum specimen size, fiber size and aggregate size are also suggested.

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Authors and Affiliations

  1. University of Michigan, Ann Arbor, USA

    A. E. Naaman

  2. University of Stuttgart and Otto-Graf-Institut, Stuttgart, Germany

    H. W. Reinhardt

Authors
  1. A. E. Naaman
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  2. H. W. Reinhardt
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Naaman, A.E., Reinhardt, H.W. Proposed classification of HPFRC composites based on their tensile response. Mater Struct 39, 547–555 (2006). https://doi.org/10.1617/s11527-006-9103-2

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  • DOI: https://doi.org/10.1617/s11527-006-9103-2

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