PURPOSE: To improve the physical properties by specifying the tensile strength of fiber, cut elongation, initial elastic modulus, dimension of bent part, etc., in a concrete reirnforcement which is formed by bending-working a rod-shaped body made of fiber-reinforced resin.
CONSTITUTION: A rod-shaped body made of fiber-reinforced resin is bending- worked to a spiral, closed fitted, or J-figure shape, and a concrete reinforcement is constituted. Organic synthetic fiber having a tensile strength of 15g/denier or more, cut elongation of 3.5% or more, and an initial elastic modulus of 300g/denier or more as specific values is used as the fiber therefor. Further, at least a part of the bent part is set to a bending angle of 90-180°, and the inside diameter D of the bent part is set to a value for specifying at most 20 times of the diameter (d) of the rod-shaped body. Then, the heating temperature in manufacture is set to a temperature of 200°C or below.
FUNABIKI HIROTADA
HATTORI SUMIO
| JPS60215559A | 1985-10-28 | |||
| JPS62138347A | 1987-06-22 |