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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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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.
The dimensions and shape of a concrete specimen...
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Relation Between Tensile Strength and Compressive Strength of Concrete01:30

Relation Between Tensile Strength and Compressive Strength of Concrete

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Concrete is a fundamental building material, and understanding its strengths is crucial for construction projects. The relationship between its tensile and compressive strengths is intricate, showing that while these strengths are related, they do not increase at the same rate. Tensile strength's growth is slower and is affected by various factors such as the methods used for testing, the size and shape of the specimen, the texture of the aggregate used, and the moisture content of the...
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Impact Strength of Concrete01:21

Impact Strength of Concrete

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Impact strength in concrete is a critical measure that reflects the material's capability to endure the forces applied during pile driving and when supporting machinery foundations that experience impulsive loads. It is also essential when handling precast concrete components to prevent accidental damage. The impact strength is assessed by observing the concrete's resistance to repeated impacts and energy absorption capacity. A key indicator of significant damage to concrete is when it...
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Behavior of Concrete Under Compressive Load01:23

Behavior of Concrete Under Compressive Load

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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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Non-destructive Tests for Concrete Strength01:12

Non-destructive Tests for Concrete Strength

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The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it...
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Influence of the composition of high-strength concrete and mortar on the compressive fatigue behaviour.

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Production and Analysis of Sporosarcina pasteurii Biocement Bricks Using Custom 3D-Printed Molds for Unconfined Compression Tests
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Compressive Fatigue Investigation on High-Strength and Ultra-High-Strength Concrete within the SPP 2020.

Marco Basaldella1, Marvin Jentsch1, Nadja Oneschkow1

  • 1Institute of Building Materials Science, Leibniz University Hannover, Appelstraße 9a, 30167 Hannover, Germany.

Materials (Basel, Switzerland)
|June 10, 2022
PubMed
Summary

Ultra-high-strength concrete (UHPC) exhibits superior fatigue resistance compared to high-strength concrete (HPC). UHPC demonstrates improved stiffness, higher ultimate strain, and greater strength, leading to enhanced performance under cyclic loading.

Keywords:
compressive fatigue resistancehigh-strength concretestiffness developmentstrain developmentultra-high-strength concrete

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Structural Engineering

Background:

  • Limited research exists on the fatigue resistance of high-strength concrete (HPC) and ultra-high-strength concrete (UHPC).
  • Existing studies often focus solely on cycles to failure, neglecting crucial damage indicators like strain and stiffness development.
  • Uncertainty in fatigue design rules for HPC and UHPC stems from a lack of comprehensive understanding of their fatigue behavior and damage mechanisms.

Purpose of the Study:

  • To investigate the fatigue behavior of HPC and UHPC under monotonic and cyclic loading.
  • To comparatively analyze the number of cycles to failure, strain development, and stiffness degradation in HPC and UHPC.
  • To elucidate the underlying damage mechanisms influencing the fatigue performance of very high-strength concrete compositions.

Main Methods:

  • Comparative analysis of one HPC and one UHPC sample under controlled laboratory conditions.
  • Application of both monotonically increasing and cyclic loading protocols to assess material response.
  • Monitoring of key damage indicators including strain, stiffness, and cycles to failure throughout the fatigue tests.

Main Results:

  • UHPC demonstrated higher stiffness, ultimate strain, and compressive strength compared to HPC.
  • UHPC endured a significantly greater number of cycles to failure than HPC under identical loading conditions.
  • Damage indicators revealed a more favorable fatigue performance profile for UHPC relative to HPC.

Conclusions:

  • UHPC exhibits superior fatigue resistance and durability compared to HPC.
  • The findings provide valuable data for refining fatigue design rules for advanced concrete materials.
  • Further research into damage mechanisms will enhance the reliable application of UHPC in structural engineering.