Anti-ageing performance test of a new sensor-enabled piezoelectric geobelt

Geosynthetics are widely used for reinforcement, and strain monitoring is essential for the safety of reinforced soil structures. This study evaluated the durability of a sensor-enabled piezoelectric geobelt (SPGB) with reinforcement and monitoring functions. Accelerated photo-oxidation and thermo-oxygen ageing tests were conducted to assess changes in mechanical and electrical properties. Ageing reduced tensile strength and elongation at break, with thermo-oxygen ageing causing the greatest deterioration; after 42 days, tensile strength retention and elongation retention decreased to 78.60% and 57.23%, respectively. Normalised impedance showed a stable linear relationship with strain, although ageing slightly reduced impedance sensitivity. Voltage output was only minimally affected, and clear voltage responses were still observed during tensile failure. These results indicate that SPGB retains reliable sensing performance after ageing and can support lifecycle monitoring of reinforced soil structures.