Measuring Toughness Characteristics of SFRC--a Critical View of ASTM C 1018


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Title: Measuring Toughness Characteristics of SFRC--a Critical View of ASTM C 1018

Author(s): D. E. Nemegeer and P. C. Tatnall

Publication: Special Publication

Volume: 155


Appears on pages(s): 77-92

Keywords: cracking (fracturing); fiber reinforced concretes; fibers; load-deflection curve; steels; toughness; Materials Research

Date: 8/1/1995

Standard Test Method for Flexural Toughness and First- Crack Strength of Fiber-Reinforced Concrete (Using Beam With Third-Point Loading), was conceived to produce toughness parameters independent of the dimensions of the test specimen. This seems not to be true. Additionally, the toughness indices that are required to be reported are shown not to be sensitive to the type and amount of fibers used, thus not providing a usable value for characterizing flexural toughness. Furthermore, since the calculation of the toughness index values are directly related to the first-crack deflection measurements, a value which is difficult to determine, these values become dependent on the testing equipment used. Proposals for revision of ASTM C 1018 are presented in this paper to address these concerns.