Expansion joints offset building thermal expansion and contraction, yet conventional fillers carry hidden risks. Basic sealing materials crack and peel under drastic temperature swings, triggering rainwater leakage and structural corrosion. Lacking monitoring functions, minor structural deformations cannot be detected timely, potentially resulting in wall rupture or collapse. High-rise buildings and large venues also face static electricity and lightning hazards, which common fillers fail to discharge, risking equipment damage and personal injury. Annual building maintenance costs due to joint cracks surpass ten billion yuan nationwide, and 17% of construction safety accidents stem from undetected structural deformation.

Made of Conductive SR composite material, the filler integrates sealing, structural monitoring, lightning and static protection to upgrade joint safety standards. The material stretches to fully fill gaps under high temperature and contracts closely against structures in cold weather, maintaining permanent sealing against moisture erosion. Its conductive characteristics serve two key functions. It rapidly conducts static and lightning currents to the ground, meeting Class II lightning protection criteria of GB 50057-2010. Resistance variation reflects real-time joint deformation caused by settlement and temperature changes. Monitoring platforms receive transmitted data and issue early warnings before safety thresholds are breached, granting sufficient maintenance time.

Applied in a Beijing super high-rise building, the filler maintains crack-free and leak-free joints for three years and lowers structural corrosion risks. Two subtle settlement cases were captured for timely reinforcement. Multiple lightning currents were safely discharged without harming electrical facilities. Compared with single-function conventional fillers, its triple advantages extend building lifespan and safeguard personnel and property. It fits high-rises, bridges, tunnels, stadiums and industrial workshops to consolidate structural safety barriers. Engineering cooperation and customized safety schemes are welcome to elevate construction safety standards.