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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: The Precision of Toughness Indexes Based on Multiples of
Author(s): B. Barr and E. B. Dawood Hasso
Publication: Journal Proceedings
Appears on pages(s): 870-876
Keywords: cracking (fracturing); deflection; fiber reinforced concretes;load-deflection curve; polypropylene fibers.
Abstract:Particular attention has been given in recently to the use of various multiples of first-crack deflections to define areas under load-deflection graphs to evaluate the toughness of fiber reinforced concrete materials. The present study investigates various multiples of first-crack deflection, the residual load at first crack, and prescribed deflections (as defined by ACI Committee 544’). To obtain the best precision for toughness index determination, the area under the load-deflection graph is considered out to twice the first graph deflection. The variation of toughness index values is shown to increase with an increase in the area of the post-cracking curve. Results of deflection-controlled, modulus of rupture, and notched-beam tests are presented.
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