NEW MICROMECHANICS DESIGN THEORY FOR PSEUDOSTRAIN HARDENING CEMENTITIOUS COMPOSITE

The micromechanics design theory has realized random short fiber-reinforced cement composites showing pseudostrain hardening (PSH) behavior with over 5% of strain capacity under tension. Nevertheless, this existing theory currently is limited to specific constituent properties, which does not account for chemical bond and fiber rupture. This article presents a new design theory that eliminates this restriction, achieving fiber rupture type PSH-random short fiber-reinforced cement composites with high-performance hydrophilic fibers like polyvinyl alcohol fibers. Uniaxial tensile tests are conducted employing polyvinyl alcohol fiber composites, the results of which support the validity of the proposed theory. Furthermore, parametric study employing the proposed theory quantitatively evaluates the effects of composite's micromechanics parameters, such as bond strength and fiber strength, on composite performance. This parametric study reveals that continuously increasing the degree of fiber rupture (fiber rupture intensity) enhances the strength performance of composites but not energy performance. However, an optimum rupture intensity exists for maximizing energy performance, which is critical for PSH behavior. The consistency between theoretical predictions and experimental results consequently demonstrates that the proposed theory can be utilized practically as a powerful and comprehensive tool for PSH composite design.

  • Availability:
  • Supplemental Notes:
    • Part of this research was supported by Grant CMS-EQ-9601262 from the National Science Foundation to the University of Michigan at Ann Arbor.
  • Corporate Authors:

    American Society of Civil Engineers

    1801 Alexander Bell Drive
    Reston, VA  United States  20191-4400
  • Authors:
    • Kanda, T
    • Li, V C
  • Publication Date: 1999-4

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00763561
  • Record Type: Publication
  • Contract Numbers: CMS-EQ-9601262, 9601503, CMS-9796135
  • Files: TRIS
  • Created Date: May 14 1999 12:00AM