Moisture Migration and High-Temperature Behavior of Concrete under Fire Conditions

The elevated temperature of fire induces the conversion of moisture in concrete to water vapor, generating high pressure within the material and driving the migration of moisture. Nonetheless, due to the concrete's low permeability and compactness, water and vapor predominantly traverse through cracks in the material. Consequently, water and vapor emanating from these fissures exhibit elevated temperatures. The findings of the fire test were corroborated by the infrared thermography camera monitoring results and macro-experimental observations.