Localization and Monitoring of Microcracks in Reinforced Concrete
Quick Summary
- Project Type:Bridge
- Structure Type:Pre-Stressed Concrete Bridge
- Location:Alpine Region
Related Equipment
Related Equipment
Objective
Early detection, localization, and quantification of microcracks in reinforced concrete beams using high-resolution distributed fiber optic sensing (DFOS). Non-visible crack identification with 1-10mm spatial resolution enables preventive maintenance and structural reinforcement decisions.
Challenge
Early detection and precise localization of microcracks in reinforced concrete, not visible to visual inspections.
Solution
QUAD-S Monitoring can implement high-resolution distributed fiber optic sensing (DFOS) technology to identify and characterize crack initiation, location, and width in real time.
Methodology
Small grooves are created along the bridge beam. Fiber optic cables are installed on the surface of the concrete element via epoxy injection inside the grooves. Each line of optical cables is monitored separately with a measurement each 1 to 10mm, producing thousands data points per line of measurement. Measurements were taken before and after reinforcement under controlled truck load tests. Advanced signal analysis is applied to estimate crack width.
Application Conditions
- Sensor installation during reinforcement work.
- Crack detection sensitivity dependent on fiber optic cable type, bonding and positioning.
- Periodic acquisition for long-term monitoring.
Monitoring System
Sensors
Data Acquisition
Results
Microcracks identified on the concrete element, undetected visually. Reliable distinction between flexion and shear cracking patterns. Monitoring confirmed safe structural performance prior to composite reinforcement.
Advantages
- Ultra-high resolution with sub-millimeter localization accuracy
- Real-time insights into evolving structural damage
- Non-intrusive and compatible with reinforced zones
- Enables preventive reinforcement planning and post-repair validation
Project Gallery
Equipment setup for bridge load test
Concrete structure with visible crack under test
Monitoring equipment on the bridge site