Compressive Toughness Characterization of Normal and High-Strength Fiber Concrete Reinforced With Steel Spirals

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Title: Compressive Toughness Characterization of Normal and High-Strength Fiber Concrete Reinforced With Steel Spirals

Author(s): G. Campione and S. Mindess

Publication: Special Publication

Volume: 182

Issue:

Appears on pages(s): 141-162

Keywords: compressive toughness; high-strength fiber concrete; steel spirals

Date: 5/1/1999

Abstract:
Steel, polyolefin and carbon fiber reinforced concretes were combined with traditional transverse steel reinforcement in the form of steel spirals. The complete stress-strain relationship and the ductility of the concrete in compression in both the unconfined and confined states was evaluated. The compressive toughness was evaluated both according to the Japanese Standard JSCE-SF5 and according to a new method proposed in the present work. The experimental program consisted of testing concrete cylinders under compression at two different strength levels: Normal (48 Mpa) and high strength (70 Mpa), polyolefin and carbon fibers. These tests were then repeated with different volume percentages Vf (1.5, 2.0 and 3.0) of steel, polyolefin and carbon fibers. These tests were then repeated with different pitches (25 and 50 mm). It was found that by combining fibers and steel spirals it is possible: (1) to obtain a high level of fracture energy dissipation, which could previously be obtained only by using a high volume percentage of spiral steel: and (2) to improve the maximum strain of the concrete, corresponding to the first failure of the spiral steel.