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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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Types of Non-structural Cracks in Concrete01:28

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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.
Plastic shrinkage cracks typically form within hours after the concrete is poured. The concrete's surface dries faster than the bottom, creating tensile stress that the still-plastic concrete cannot withstand, leading to diagonal or randomly patterned cracks on the concrete surface.
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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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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 a...
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Elasticity in Concrete01:20

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Upon subjecting concrete to moderate or high uniaxial compressive or tensile stresses, the strain response is non-linear relative to the stress applied. As the stress is removed, the resulting stress-strain curve deviates from the original path traced during loading, creating a hysteresis loop, indicative of the concrete's non-linear and non-elastic properties. Typically, a material's modulus of elasticity, which is a measure of the material's stiffness, is inferred from the linear...
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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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Extracting non-propagating oscillatory fields in concrete to detect distributed cracking.

Homin Song1, John S Popovics2

  • 1Nuclear Science and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, USA.

The Journal of the Acoustical Society of America
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Summary
This summary is machine-generated.

This study introduces a novel method to detect and locate subsurface cracks in concrete by analyzing non-propagating oscillatory fields. This technique successfully identifies distributed crack zones in concrete and similar materials.

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Area of Science:

  • Geophysics
  • Materials Science
  • Non-destructive Testing

Background:

  • Subsurface crack detection in concrete is crucial for structural integrity.
  • Existing methods struggle with distributed, non-propagating crack patterns.
  • Understanding wave scattering in inhomogeneous media is key.

Purpose of the Study:

  • To develop and validate a method for detecting and locating distributed subsurface cracks in concrete.
  • To differentiate crack-induced scattering from other medium heterogeneities.
  • To utilize non-propagating oscillatory fields for crack zone identification.

Main Methods:

  • Theoretical modeling using a one-dimensional point-scatterer model.
  • Numerical simulations of wave scattering by large particles and cracks.
  • Frequency-wavenumber (f-k) domain analysis to extract specific wavefield energy.
  • Experimental validation using concrete specimens with simulated cracks.

Main Results:

  • Non-propagating resonance-like oscillatory fields are generated within cracked zones.
  • These crack-induced fields exhibit distinct scattering behavior compared to large particles.
  • Frequency-wavenumber analysis effectively isolates the energy of these oscillatory fields.
  • Successful detection and location of distributed crack zones were achieved in simulations and experiments.

Conclusions:

  • The proposed method reliably detects and locates distributed subsurface cracks in concrete.
  • Analysis of non-propagating oscillatory fields offers a promising approach for non-destructive evaluation of cracked media.
  • The technique is applicable to various inhomogeneous media beyond concrete.