Elongation of Life Time of Concrete Structures by Controlling Crack Width with New Materials

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This research project tried to develop a methodology for realizing a long life of concrete structures by increasing greatly the capability to resist cracking in concrete. As a result, it was clarified that a proper mix-designing of hybrid fiber reinforced cement-based composites (HFRCC) leads to reduce remarkably the crack width in columns and shear-walls under severe earthquakes and that such a high toughness of HFRCC can contribute a lot to increase the toughness of structural members and to reduce permeability through the members for controlling the rate of corrosion of reinforcing steel bars.