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Related Concept Videos

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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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.
As the concrete specimen fractures under...
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Dynamic Modulus of Elasticity of Concrete01:16

Dynamic Modulus of Elasticity of Concrete

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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 a...
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Non-destructive Tests for Concrete Strength01:12

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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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Abrasion Resistance of Concrete01:23

Abrasion Resistance of Concrete

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Abrasion resistance is an essential characteristic of concrete that determines its durability and longevity under various wear conditions. Concrete surfaces are vulnerable to different types of abrasion. For instance, surfaces may wear down due to the constant movement of vehicles or be eroded by solids carried in water, as seen in concrete canal linings. Specific tests are conducted to measure the abrasion resistance of concrete.
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Shrinkage in Concrete01:27

Shrinkage in Concrete

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Shrinkage in concrete is primarily due to water loss from evaporation, hydration of cement, or carbonation, leading to a reduction in volume. The volumetric contraction results in volumetric strain in concrete. However, in practice, shrinkage is measured as linear strain, which is one-third of the volumetric strain.
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Experimental study on concrete expansion performance and cracking time under SCDA pressure using DOFS technology.

Minghe Liu1

  • 1College of Artificial Intelligence and Automation, Hohai University, Changzhou, 213200, Jiangsu, China. 17312898239@163.com.

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Summary

Researchers used soundless chemical demolition agent (SCDA) and Distributed Optic Fiber Sensing (DOFS) to measure concrete strain. DOFS technology proved more accurate than static testers for evaluating concrete strain and cracking time.

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Structural Health Monitoring

Background:

  • Internal expansion pressure in concrete can lead to cracking.
  • Accurate measurement of strain distribution and cracking time is crucial for structural integrity.

Purpose of the Study:

  • To investigate the strain distribution in concrete under internal expansion pressure.
  • To evaluate the effectiveness of Distributed Optic Fiber Sensing (DOFS) in monitoring concrete expansion.
  • To determine the cracking time and tensile stress of concrete under soundless chemical demolition agent (SCDA) pressure.

Main Methods:

  • Experiments were conducted on cubic concrete specimens with a central hole.
  • Soundless chemical demolition agent (SCDA) was used to induce internal expansion pressure.
  • Distributed Optic Fiber Sensing (DOFS) technology was employed for strain measurement, alongside a static strain tester for comparison.

Main Results:

  • A linear correlation was observed between strain and time, and a negative correlation between strain and distance from the hole.
  • Strain-position peak shapes at different times followed classical mechanics principles.
  • The cracking time for a 150-mm C40 concrete cube under SCDA pressure was determined to be 73.3 minutes.

Conclusions:

  • DOFS technology offers higher accuracy and sensitivity than static strain testers for concrete strain and cracking time evaluation.
  • DOFS can effectively capture spatial strain distribution information.
  • The findings are applicable to research on various expansion materials and structures.