Test Parameters for Evaluating Toughness of Glass Fiber Reinforced Concrete Panels

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Title: Test Parameters for Evaluating Toughness of Glass Fiber Reinforced Concrete Panels

Author(s): Barzin Mobasher and Surendra P. Shah

Publication: Materials Journal

Volume: 86

Issue: 5

Appears on pages(s): 448-458

Keywords: accelerated tests; age; cracking (fracturing); durability; fiber reinforced concretes; flexural tests; glass fibers; impact tests; mechanical properties; microcracking; stress-strain relationships; tensile strength; tension tests; Materials Research

DOI: 10.14359/2028

Date: 9/1/1989

Abstract:
Influence of different test methods to measure the toughness of glass fiber reinforced concrete (GFRC) composites are described. Three loading configurations of uniaxial tensile, third-point flexural, and instrumented impact were used. Work of fracture was observed to be dependent on the specimen geometry, loading geometry, gage length used, strain rate, and the extent of accelerated aging. Assuming that the local tensile stress-strain response can be expressed in the form of bilinear ascending portion and an exponentially descending portion, the gate length affects as well as the loading geometry effects can be predicted. Using the analytical tensile stress-strain response, the experimentally observed flexural load-deflection and toughness were predicted. Possible methods to formulate the aging mechanisms in the composites are also discussed. It is concluded that for the characterization of toughness of GFRC consideration of gage length, nonuniform strain distribution, the geometry, and the rate of loading must be considered carefully.


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