MEASUREMENT OF FLEXURAL TOUGHNESS OF FIBER-REINFORCED CONCRETE USING A NOVEL TECHNIQUE--PART 2: PERFORMANCE OF VARIOUS COMPOSITES

In Part I of this paper, a newly developed method of measuring the flexural toughness of fiber-reinforced concrete in terms of its postpeak residual strength was investigated. In this technique, called the residual strength test method, a stable narrow crack is first created in the beam specimen by loading it in parallel with a steel plate. Next, the plate is removed and the specimen is reloaded to obtain the postcrack load-displacement response which, when analyzed, provides the residual strength of the material. A direct comparison of the technique with the closed-loop method revealed that the technique produced reliable toughness data and was especially useful for measuring the postcrack residual strengths of composites with a pronounced postpeak instability. This study applied the technique to a wide range of fiber-reinforced composites carrying various volume fractions of polymeric and steel fibers. It found that the variability in the test remained acceptably low and that the technique was capable of identifying the influence of various fiber characteristics such as type, length, configuration, volume fraction, geometry, and the elastic modulus.

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  • English

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  • Accession Number: 00792316
  • Record Type: Publication
  • Contract Numbers: CMS-9413725
  • Files: TRIS
  • Created Date: May 11 2000 12:00AM