Dynamic Compressive Toughness of High Strength Fiber Reinforced Concrete

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Title: Dynamic Compressive Toughness of High Strength Fiber Reinforced Concrete

Author(s): Lihe Zhang and Sidney Mindess

Publication: Special Publication

Volume: 281

Issue:

Appears on pages(s): 1-21

Keywords: Fiber reinforced concrete, dynamic compressive toughness, impact, dynamic improvement factor

Date: 12/27/2011

Abstract:
Fiber reinforced concrete (FRC) is known to exhibit superior performance in its post-peak energy absorption capacity, (i.e., toughness) under flexural and tensile loading. However, the behavior of fiber reinforced concrete under compressive impact has not previously been investigated. In the present research, the strain rate response of fiber reinforced concrete under compressive impact was investigated over the full strain rate regime, from static loading to high strain rate loading, and finally to impact loading. FRC was found to have higher strengths under compressive impact loading than under static loading. The compressive toughness under impact loading increased due to the high peak load and the high strain capacity. FRC displays a much higher Dynamic Improvement Factor (DIF) under compressive impact and provides an overall higher performance under impact than under static loading. Finally, the existing CEB model for dynamic behavior of concrete was evaluated and a new constitutive model, the RCM modelis proposed to describe the DIF of the compressive strength of FRC. The model was found to match the test results for FRC at 50 MPa, 90 MPa, and 110 MPa (7250, 10,150 and 13,000 psi) at strain rate from 10-5 1/sec to the strain rate of 10 1/sec.