ABSTRACT
ABSTRACT: The authors have developed a kind of Ultra High Strength Fiber Reinforced Concrete (UFC) with high compressive strength and high tensile ductility and have been studying for practical use. UFC makes it possible to reduce the weight of prestressed concrete structures. Particularly in case that UFC is applied to pretensioned members, high bond strength can also be expected to reduce the transfer length. Autogenous shrinkage and creep in early age of UFC, however, reduces effective prestress. In this study, its basic mechanical properties concerning effective prestress such as shrinkage and creep in early age were investigated to get design values for the material. Prestressing tests were also conducted to determine transfer length and effective stress. Furthermore, flexural and shear tests using beam members were conducted and it was revealed that flexural and shear capacity could be estimated using the formula shown in “Recommendations for Design and Construction of Ultra High Strength Fiber Reinforced Concrete Structures, -Draft” by Japan Society of Civil Engineers.
