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Related Concept Videos

Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

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Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
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Behavior of Concrete Under Compressive Load01:23

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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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Tensile Strength Considerations of Concrete01:16

Tensile Strength Considerations of Concrete

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Considering the tensile strength of concrete involves recognizing that the theoretical strength of cement paste can be up to a thousand times higher than what is observed in practical applications. This significant discrepancy is largely attributed to the presence of microscopic cracks within the concrete. These cracks tend to amplify stress at their tips when a load is applied, a phenomenon explained by Griffith's theory of brittle fracture.
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Creep in Concrete01:22

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Creep refers to the time-dependent increase in strain under a sustained load, excluding other time-dependent deformations associated with shrinkage, swelling, and thermal expansion in concrete. The primary mechanism behind creep involves the loss of physically adsorbed water from the calcium silicate hydrate within the hydrated cement paste. This process is further exacerbated by concrete's non-linear stress-strain relationship, microcrack development in the interfacial transition zone, and...
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Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
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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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Performance of Repaired Concrete under Cyclic Flexural Loading.

Boyu Wang1, Rishi Gupta1

  • 1Department of Civil Engineering, University of Victoria, 3800 Finnerty Road, Victoria, BC V8W 2Y2, Canada.

Materials (Basel, Switzerland)
|April 3, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces an accelerated cyclic loading test for cementitious repair materials, reducing testing time. Mix M demonstrated the longest fatigue life and superior bond strength, confirming the Palmgren-Minder rule

Keywords:
bondcyclic loadinghysteric behaviorrepair materials

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Structural Health Monitoring

Background:

  • Cyclic loading tests on cement-based repair materials are crucial but time-consuming.
  • Limited research exists on accelerated fatigue testing methodologies for these materials.

Purpose of the Study:

  • To develop and validate a novel, accelerated cyclic loading regime for evaluating cement-based repair materials.
  • To assess the fatigue life and bond strength of different repair mixes using this new method.
  • To confirm the applicability of the Palmgren-Minder rule for fatigue life estimation in accelerated testing.

Main Methods:

  • Implementation of a novel loading regime with increasing stress amplitude to expedite testing.
  • Application of the Palmgren-Minder rule for estimating fatigue life of repaired specimens.
  • Comparative analysis of fatigue performance, slant, and splitting bond strength across different repair mixes (Mix M, Mix S).

Main Results:

  • Specimens repaired with Mix M exhibited the longest fatigue life (95,991 cycles) and highest fatigue endurance limit (77.4%).
  • Mix M also demonstrated superior slant and splitting bond strength compared to other mixes.
  • The estimated fatigue endurance limit for Mix S (70.8%) closely matched literature values (71%) obtained via traditional methods.
  • The novel loading regime produced comparable results to traditional methods, significantly reducing test duration.

Conclusions:

  • The novel accelerated cyclic loading regime is effective in shortening test processes for cement-based repair materials while yielding reliable results.
  • The Palmgren-Minder rule is a useful tool for estimating fatigue life under accelerated testing conditions.
  • Mix M shows significant promise as a high-performance repair material due to its superior fatigue life and bond strength.
  • Future research should refine failure criteria for improved prediction accuracy, especially for specimens with high endurance.