Self-healing effects on fracture toughness of multi-scale fiber-reinforced UHPC after exposure to high temperatures through multi-stage phase change material synergy

Key Points

• Fracture toughness improved significantly after self-healing at high temperatures — utilizing multi-stage phase change materials enhances durability.
• The improvement was quantified by a 25% increase in toughness after exposure, demonstrating the material's resilience.
• Assessment using multi-scale fiber reinforcement and phase change materials compares durability before and after high-temperature exposure.
• These findings suggest that multi-scale fiber reinforcement may enable UHPC to withstand elevated temperatures, promoting structural longevity.