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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

Types of Non-structural Cracks in Concrete

537
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.
537
Measurement of Air Content in Concrete01:23

Measurement of Air Content in Concrete

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Air content measurement in concrete is critical for ensuring structural integrity and durability of concrete structures, especially in environments prone to severe weather conditions. Accurate air content analysis optimizes concrete's resistance to freeze-thaw cycles and enhances its workability and strength. Several methods are standardized under ASTM guidelines to measure the air content in fresh concrete, each suitable for different concrete types and conditions.
The pressure method,...
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Non-destructive Tests for Concrete Strength01:12

Non-destructive Tests for Concrete Strength

655
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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Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device01:30

Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device

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Surveyors use Global Positioning System (GPS) technology to measure the precise location and elevation of points on Earth. In a recent survey, GPS receivers were used to determine the coordinates and elevations of two park monuments. The process involved careful mission planning, data collection, and correction to ensure accuracy. The survey began with mission planning to identify optimal satellite visibility and minimize Position Dilution of Precision (PDOP). A geodetic control point...
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Accelerated Curing of Concrete01:25

Accelerated Curing of Concrete

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Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
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Related Experiment Video

Updated: Feb 23, 2026

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
05:30

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Concrete Crack Identification Using a UAV Incorporating Hybrid Image Processing.

Hyunjun Kim1, Junhwa Lee2, Eunjong Ahn3

  • 1School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea. guswns3@unist.ac.kr.

Sensors (Basel, Switzerland)
|September 8, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for concrete crack assessment using unmanned aerial vehicles (UAVs) and hybrid image processing. The system accurately measures crack width and length, improving structural maintenance efficiency and safety.

Keywords:
concrete structurecrack identificationdigital image processingstructural health monitoringunmanned aerial vehicle

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Area of Science:

  • Civil Engineering
  • Structural Health Monitoring
  • Robotics

Background:

  • Manual concrete crack assessment is subjective, time-consuming, and potentially unsafe.
  • Existing Unmanned Aerial Vehicle (UAV) applications lack precise crack width and length measurements due to distance estimation challenges.

Purpose of the Study:

  • To develop an advanced crack identification strategy combining UAV technology with hybrid image processing.
  • To accurately estimate crack width and length, overcoming limitations of current UAV-based inspection methods.

Main Methods:

  • Integration of a camera, ultrasonic displacement sensor, and WiFi module on a UAV for crack imaging and distance measurement.
  • Application of hybrid image binarization for precise crack width estimation and minimal length data loss.

Main Results:

  • The proposed system successfully measures cracks with widths greater than 0.1 mm.
  • Achieved a maximum crack length estimation error of 7.3%.

Conclusions:

  • The developed UAV-based system offers an accurate and efficient solution for concrete crack assessment.
  • This technology enhances structural maintenance by providing reliable crack data, improving safety and reducing costs.