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Related Concept Videos

Reinforcements in Concrete01:25

Reinforcements in Concrete

457
Reinforced concrete is a composite material used extensively in construction, combining the compressive strength of concrete with the tensile strength of steel. This synergy is essential as concrete, while excellent at resisting compression, is weak under tension. Steel bars, or rebars, are embedded in the concrete to handle these tensile forces. The choice of steel is strategic; it shares a similar coefficient of thermal expansion with concrete, which ensures uniformity in response to...
457
Types of Non-structural Cracks in Concrete01:28

Types of Non-structural Cracks in Concrete

488
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.
488
Fiber Reinforced Concrete01:22

Fiber Reinforced Concrete

368
Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
368
Preplaced Aggregate Concrete01:29

Preplaced Aggregate Concrete

376
Preplaced aggregate concrete is ideal for construction environments that are not easily accessible. The process begins by properly wetting the gap-graded coarse aggregates to remove the dirt, then placing it in the form and compacting it. Voids are filled with a mortar mix pumped under pressure through slotted pipes. This mortar typically consists of Portland cement, pozzolan, fine aggregates, water, and a fluidizing aid. The pozzolan helps reduce bleeding and segregation while improving the...
376
Design Example: Distributing Reinforcements in Concrete Sections01:22

Design Example: Distributing Reinforcements in Concrete Sections

267
The topic explores the practical aspects of adjusting steel reinforcements within a concrete beam section to meet specific design requirements. When designing a reinforced concrete beam, it is essential to distribute the steel reinforcements properly to ensure structural integrity and efficiency. The example provided details a scenario where a beam requires a total steel cross-section of 4 square inches. The engineer identifies that the available steel bars have a nominal diameter of 1.693...
267
Alkali Aggregate Reaction in Concrete01:26

Alkali Aggregate Reaction in Concrete

496
The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...
496

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Related Experiment Video

Updated: Jan 25, 2026

Experimental Protocol to Determine the Chloride Threshold Value for Corrosion in Samples Taken from Reinforced Concrete Structures
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Crack Detection of FRP-Reinforced Concrete Beam Using Embedded Piezoceramic Smart Aggregates.

Tianyong Jiang1, Yue Hong2, Junbo Zheng3

  • 1School of Civil Engineering, Changsha University of Science and Technology, Changsha 410114, China. tianyongjiang@csust.edu.cn.

Sensors (Basel, Switzerland)
|May 1, 2019
PubMed
Summary

This study introduces a low-cost stress wave sensing method using smart aggregates to detect cracks in Fiber Reinforced Polymer (FRP)-reinforced concrete beams. The technique effectively monitors crack development and provides early warnings for structural health.

Keywords:
concrete crack damagefiber-reinforced polymer (FRP) reinforced concrete beampiezoceramic transducersmart aggregates (SAs)wavelet packet energy

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Area of Science:

  • Structural Engineering
  • Materials Science
  • Non-Destructive Testing

Background:

  • Fiber Reinforced Polymer (FRP)-reinforced concrete beams are susceptible to cracking under load.
  • Effective crack detection is crucial for ensuring the safety and longevity of these structures.
  • Existing monitoring methods may be costly or lack real-time capabilities.

Purpose of the Study:

  • To develop and validate a stress wave-based active sensing method for crack detection in FRP-reinforced concrete beams.
  • To investigate the influence of FRP bar properties on crack behavior.
  • To assess the effectiveness of embedded smart aggregates for real-time structural health monitoring.

Main Methods:

  • Utilized embedded smart aggregates (SAs) with Lead Zirconate Titanate (PZT) transducers to generate and sense stress waves.
  • Monitored crack occurrence and development using SA pairs placed on the main reinforcement.
  • Analyzed stress wave signals in time and frequency domains, extracting damage features via wavelet packet energy.

Main Results:

  • The active sensing method successfully detected crack-induced damage in FRP-reinforced concrete beams.
  • Increased contact area between FRP bars and concrete improved cracking load and reduced crack propagation.
  • Higher elastic modulus of the main bar slowed crack development and reduced beam displacement.

Conclusions:

  • The developed piezoceramic-based active sensing method offers a low-cost, real-time solution for monitoring cracks in FRP-reinforced concrete beams.
  • The method can estimate damage progression and provide early warnings, enhancing structural safety.
  • Findings provide valuable insights for designing and maintaining FRP-reinforced concrete structures.