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Heat-exposed High-Performance Concrete (HPC) has been the subject of relatively few studies focused on the relationship between the chemo-physical processes occurring in concrete constituents (microscopic level) and concrete mechanical properties (macroscopic level).In order to investigate the correlation between the intrinsic damage and the mechanical damage induced by heat exposure, eleven concrete mixes have been investigated, differing for: compressive strength (fcm, cube ≥ 45, 70, 95 MPa),aggregate type, fiber type (polymeric and metallic) and fiber content.