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Related Concept Videos

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.
One such test is the revolving disc test, where three plates...
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Acid Attack on Concrete01:21

Acid Attack on Concrete

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When acids come into contact with concrete, they initiate a chemical reaction that dissolves the hydrated cement paste. This process leads to softening and structural weakening of the concrete. This issue is commonly observed in environments such as chimneys, sewers, and industrial settings. The severity of the damage increases as the pH of the water interacting with the concrete drops below 6.5. In particular, a pH under 4.5 can cause significant concrete damage.
The rate at which hydrogen...
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Corrosion of Reinforcement01:27

Corrosion of Reinforcement

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The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
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Effect of Sea Water on Concrete01:22

Effect of Sea Water on Concrete

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Concrete exposed to seawater can undergo degradation like the dissolution of ettringite and gypsum, increasing the material's porosity and decreasing its strength. In contrast, the crystallization of salts within the concrete's pores can cause expansion, particularly above the waterline where evaporation occurs. Nonetheless, this expansion only happens when seawater, enabled by the concrete's permeability, manages to infiltrate the structure.
Concrete in areas between tide marks,...
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Microcracking in Concrete01:20

Microcracking in Concrete

96
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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Sulfate Attack on Concrete01:29

Sulfate Attack on Concrete

102
Sulfate attack on concrete is a deterioration process characterized by a whitish discoloration beginning at the edges and corners, accompanied by cracking and spalling. This phenomenon occurs when sulfates react with the components of hardened concrete, forming compounds like calcium sulfate and calcium sulfoaluminate which occupy more space than the substances they replace, causing the concrete to expand and disrupt.
Sulfates from sources like soil, groundwater, or industrial effluents...
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Related Experiment Video

Updated: May 24, 2025

Experimental Protocol to Determine the Chloride Threshold Value for Corrosion in Samples Taken from Reinforced Concrete Structures
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A GPR-based framework for assessing corrosivity of concrete structures using frequency domain approach.

Nour Faris1, Ahmed K Khalil1,2, Mohamed A A Abdelkareem3

  • 1Department of Building and Real Estate (BRE), Faculty of Construction and Environment (FCE), The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.

Heliyon
|March 3, 2025
PubMed
Summary

This study presents an advanced ground-penetrating radar (GPR) interpretation method for concrete structures. It improves corrosion detection accuracy by analyzing GPR data in both time and frequency domains.

Keywords:
CorrosionGround penetrating radarNon-destructive testingReinforced concrete structureShort-time fourier transform

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Non-Destructive Testing

Background:

  • Ground-penetrating radar (GPR) is crucial for evaluating concrete structure integrity.
  • Traditional GPR interpretation relies on rebar reflection intensity, which is susceptible to complex environmental factors.
  • Accurate assessment of rebar corrosion is vital for structural safety and maintenance.

Purpose of the Study:

  • To develop a more robust GPR data interpretation method for concrete corrosivity evaluation.
  • To enhance the accuracy of detecting and quantifying corrosion-induced deterioration in reinforced concrete.
  • To overcome limitations of traditional amplitude-based GPR analysis.

Main Methods:

  • Implemented efficient GPR data collection and pre-processing techniques.
  • Utilized deep learning for rebar recognition and Short-Time Fourier Transform (STFT) for time-frequency analysis.
  • Normalized center frequency of rebar responses and applied depth correction for standardized analysis.
  • Optimized and validated GPR condition mapping thresholds using ground truth data (hammer tapping, reinforcement exposure).

Main Results:

  • The developed GPR method demonstrated superior performance over traditional amplitude-based approaches.
  • Achieved an average accuracy of 0.80 for detecting active corrosion.
  • Reached an average accuracy of 0.84 for detecting active corrosion with delamination.

Conclusions:

  • The proposed time and time-frequency domain GPR analysis offers a more reliable method for assessing concrete corrosivity.
  • This comprehensive approach significantly improves the detection and quantification of corrosion-induced structural damage.
  • The findings support the adoption of advanced GPR interpretation techniques for enhanced infrastructure monitoring.