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Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
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Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
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Non-structural cracks are primarily of three types: plastic, early-age thermal, and drying shrinkage cracks. Plastic cracks are further classified into plastic shrinkage cracks and plastic settlement cracks.
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Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
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The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
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Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
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Computational Fracture Evolution Analysis of Steel-Fiber-Reinforced Concrete Using Concrete Continuous Damage and

Iwona Pokorska1,2, Mariusz Poński1, Wojciech Kubissa3

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Summary

This study investigates steel-fiber-reinforced concrete (SFRC) cracking using fracture mechanics. Experimental and numerical analyses show quasi-static methods are suitable, but dynamic effects remain challenging to model accurately.

Keywords:
concretecrack mouth opening displacement (CMOD)finite element method (FEM) simulationssteel fiberssteel-fiber-reinforced concrete (SFRC)

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Mechanics of Materials

Background:

  • Concrete cracking, initiated by moisture loss, is a prevalent issue.
  • Fracture mechanics provides a framework for understanding concrete's fracture behavior.
  • Steel-fiber-reinforced concrete (SFRC) offers enhanced mechanical properties.

Purpose of the Study:

  • To experimentally and numerically analyze the fracture behavior of SFRC.
  • To investigate the force (F) - crack mouth opening displacement (CMOD) curves under bending.
  • To assess the applicability of quasi-static numerical methods for SFRC fracture analysis.

Main Methods:

  • Three-point bending tests were performed on SFRC samples with notches.
  • Non-standard sample dimensions were used to capture rapid F-CMOD curve changes.
  • Probabilistic analysis was conducted on key material parameters.

Main Results:

  • Quasi-static numerical methods can yield suitable results for SFRC fracture analysis.
  • Experimental F-CMOD curves revealed significant dynamic effects.
  • Key material properties like peak strength and fracture energy were probabilistically analyzed.

Conclusions:

  • Quasi-static numerical simulations are viable for analyzing SFRC fracture.
  • Accurately modeling dynamic effects in SFRC remains a challenge.
  • Understanding crack energy and material properties is crucial for SFRC applications.