The main theme of this paper is to focus on the mechanisms for achieving high ductility of the interface between substrate concrete and patched repair materials. For that purpose, this paper elaborates the relationship between the mechanical performance of the…
The main theme of this paper is to focus on the mechanisms for achieving high ductility of the interface between substrate concrete and patched repair materials. For that purpose, this paper elaborates the relationship between the mechanical performance of the concrete beam with an interface layer of patched repair and the fractographic characteristics of the fractured surface. The authors conducted four cases of FEM analysis under bending load employing “KAT model”, which the authors newly established. Also experimental investigation was conducted with using the same types of specimens as the FEM analysis. The results from FEM analysis are consistent to the experimental ones in terms of the behavior, mechanical properties and crack paths. The authors conducted the fractographic analysis and found an index which is consistently proportional to the mechanical performance. The simulations by KAT model revealed the mechanisms which lead to high ductility, and it also revealed the mechanisms why the index based on fractographic characteristics has a strong relationship with the mechanical performance.