Concrete Crack Detection and Monitoring Using a Capacitive Dense Sensor Array

Area of Science:

• Materials Science
• Civil Engineering
• Structural Health Monitoring

Background:

• Cracks in concrete structures indicate damage, impacting durability and safety.
• Timely crack identification is crucial for structural integrity and maintenance.
• Existing monitoring systems (strain gauges, fiber optics) are costly for large surfaces.

Purpose of the Study:

• To introduce and validate a novel sensing skin for concrete crack monitoring.
• To assess the efficacy of soft elastomeric capacitors (SEC) for structural health monitoring.
• To demonstrate a low-cost, robust solution for detecting cracks in large concrete structures.

Main Methods:

• Development of a flexible electronic sensing skin using soft elastomeric capacitors (SEC).
• Detection of strain changes via capacitance variations.
• Validation on small-scale reinforced and full-scale post-tensioned concrete beams.

Main Results:

• The SEC sensing skin successfully detected, localized, and quantified cracks.
• Preliminary validation on a small-scale beam was confirmed on a full-scale specimen.
• The technology proved effective for both reinforced and post-tensioned concrete.

Conclusions:

• The novel SEC sensing skin is a viable, low-cost technology for concrete crack monitoring.
• This approach offers a robust and scalable solution for structural health monitoring.
• The findings support enhanced structural safety and proactive maintenance of concrete infrastructure.