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Development and Field Construction Protection of a Fiber Bragg Grating-Geogrid Integrated System in Asphalt Pavements
Hui Wang1, Da Zhang2, Qiaoyi Li3
1Cangzhou Qugang Expressway Construction Co., Ltd., Cangzhou 061000, China.
Materials (Basel, Switzerland)
|May 27, 2026
Summary
Armored Fiber Bragg Grating (FBG) sensors integrated into geogrids offer robust mechanical monitoring for asphalt pavements. This armored sensor design ensures reliable strain data collection in challenging construction environments.
Area of Science:
- Materials Science
- Civil Engineering
- Sensor Technology
Background:
- Field monitoring of geogrid mechanical response in asphalt pavements presents significant challenges.
- Existing sensor integration methods often lack the durability required for industrial production and harsh paving conditions.
Purpose of the Study:
- To integrate and evaluate Fiber Bragg Grating (FBG) sensors (armored and unarmored) into geogrids for asphalt pavement monitoring.
- To assess the suitability of different sensor types for industrial production and field performance.
- To develop a protection strategy for sensors during asphalt paving.
Main Methods:
- Integration of unarmored and armored FBG sensors into geogrids using the pillar-stitching technique on industrial warp-knitting lines.
- Evaluation of sensor systems in wound and flattened configurations.
- Precise strain calibration and full-scale field damage testing during expressway construction.
- Development and application of a protection scheme using silicone rubber composites.
Main Results:
- The helical steel armor layer significantly enhances FBG sensor mechanical durability and optical transmission stability.
- The armored FBG sensor maintained 98.86% performance retention in the flattened state over 60m.
- A strong linear correlation was observed between the armored FBG sensor's wavelength shift and geogrid tensile strain.
- Unarmored sensors failed due to shear deformation and breakpoints during production.
- The protection scheme effectively shielded sensors from high temperatures and compaction loads.
Conclusions:
- The proposed FBG-geogrid integration method, particularly with armored sensors, is suitable for industrial production and real-time monitoring.
- The developed field protection strategy ensures sensor survival and reliable data acquisition during asphalt paving.
- This technology provides valuable technical support and engineering value for monitoring geogrid performance in asphalt pavements.
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