Research on the blast-resistant performance of concrete walls coated with explosion-proof materials under hydrogen explosion conditions

Hydrogen energy boasts a multitude of benefits and is poised to become a pivotal component of the future energy infrastructure. Despite its promise, the high energy density and inherent flammability and explosiveness of hydrogen pose significant challenges to its widespread adoption and application. In the event of a hydrogen leak and subsequent ignition during utilization, an efficient explosion-proof coating on structural components could be instrumental in mitigating potential losses to both personnel and property. Hydrogen energy's promise is counterbalanced by explosion risks during leaks. In this study, the test of 15 mm thick blocks (front-coated with 3 mm polyurea) to hydrogen-air explosions (15 % H₂) generated in a Ø 600 mm spherical device were conducted. The findings revealed that (1) coated blocks sustained localized center damage (peak horizontal strain ∼9000 με) with back cracking, while uncoated blocks fragmented entirely; (2) coating reduced front vertical strain by 83 %; (3) backside vertical strain exceeded limits (>32768 με) in all tests, confirming tensile failure dominance. Results validate polyurea's viability for retrofit protection in hydrogen infrastructure and averting large-scale disasters.