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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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Dynamic Modulus of Elasticity of Concrete01:16

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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.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
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Hot Weather Concreting01:20

Hot Weather Concreting

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Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
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Microcracking in Concrete01:20

Microcracking in Concrete

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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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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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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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Residual Compressive Strength Prediction Model for Concrete Subject to High Temperatures Using Ultrasonic Pulse

Wonchang Kim1, Hyeonggil Choi2, Taegyu Lee1

  • 1Department of Fire and Disaster Prevention, Semyung University, Jecheon-si 27136, Republic of Korea.

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Lightweight aggregate concrete (LC) shows greater mass loss but retains superior mechanical properties after high-temperature exposure compared to normal concrete (NC). A new prediction equation for residual strength based on ultrasonic pulse velocity (UPV) and water-to-cement ratio (W/C) was developed.

Keywords:
compressive strengthhigh temperatureprediction modeltype of coarse aggregateultrasonic pulse velocitywater-binder

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Structural Engineering

Background:

  • Understanding concrete's performance under extreme conditions like high temperatures is crucial for structural safety.
  • Normal aggregate concrete (NC) and lightweight aggregate concrete (LC) exhibit distinct responses to thermal stress.

Purpose of the Study:

  • To investigate and compare the residual mechanical properties of NC and LC after exposure to elevated temperatures.
  • To analyze the relationship between ultrasonic pulse velocity (UPV) and compressive strength at high temperatures.
  • To develop a more accurate prediction model for residual concrete strength considering water-to-cement ratio (W/C).

Main Methods:

  • Mechanical properties (mass loss, compressive strength, UPV, elastic modulus) of NC and LC were measured after heating to 100, 200, 300, 500, and 700 °C.
  • Residual properties were compared to preheating (20 °C) values.
  • Correlation between UPV and compressive strength was analyzed, and a new prediction equation was formulated.

Main Results:

  • LC exhibited a higher mass reduction rate than NC at all tested temperatures.
  • LC demonstrated superior residual mechanical properties compared to NC post-heating.
  • The correlation between UPV and compressive strength at high temperatures differed significantly from room temperature predictions.

Conclusions:

  • Lightweight aggregate concrete offers better resistance to high temperatures in terms of mechanical property retention.
  • A refined prediction equation for residual compressive strength, incorporating W/C, improves accuracy for high-temperature scenarios.
  • UPV serves as a viable indicator for assessing the mechanical integrity of concrete exposed to thermal loads.