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Related Concept Videos

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...
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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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Fatigue Strength of Concrete01:22

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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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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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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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Spatially resolved capacitance-based stress self-sensing in concrete.

D D L Chung1, Murat Ozturk2

  • 1Composite Materials Research Laboratory, Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260-4400, USA.

ISA Transactions
|July 9, 2024
PubMed
Summary
This summary is machine-generated.

This study demonstrates spatially resolved stress self-sensing in concrete using capacitance changes. Unmodified concrete shows reversible capacitance shifts under compressive load, enabling localized stress monitoring.

Keywords:
CapacitanceConcreteElectrical behaviorSelf-sensingSpatially resolvedStress

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Structural Health Monitoring

Background:

  • Structural health monitoring (SHM) is crucial for infrastructure maintenance.
  • Developing cost-effective and non-intrusive sensing methods for concrete structures is an ongoing challenge.
  • Capacitance-based sensing offers potential for embedded or surface-attached monitoring systems.

Purpose of the Study:

  • To demonstrate spatially resolved stress self-sensing in unmodified concrete using capacitance measurements.
  • To investigate the relationship between applied stress, spatial resolution, and capacitance changes.
  • To evaluate the feasibility of this method for practical structural health monitoring applications.

Main Methods:

  • Utilized parallel coplanar aluminum electrodes attached to concrete surfaces.
  • Measured in-plane capacitance changes in response to applied compressive loads.
  • Varied loading conditions and electrode configurations to assess spatial resolution and sensitivity.

Main Results:

  • Achieved spatial resolution of 45 mm in the direction of capacitance measurement.
  • Demonstrated monotonic and reversible decrease in capacitance with increasing compressive stress (up to 3000 Pa).
  • Observed higher fractional capacitance decrease for more concentrated loading and smaller inter-electrode distances.

Conclusions:

  • Spatially resolved capacitance-based stress self-sensing is feasible in unmodified concrete.
  • The method is sensitive to load concentration and inter-electrode distance.
  • Embedded steel reinforcement with a 20 mm concrete cover did not interfere with the sensing capability.