REINFORCEMENT MATERIAL

PURPOSE:To ensure high performance by gluing the single yarns of a polyvinyl alcohol fiber to each other, aggregating and arranging the virtual number of yarns, and bonding the yarns via a binding material. CONSTITUTION:The single yarns of a polyvinyl alcohol fiber having tensile strength equal to 14g/dr or above, a Young's modulus of 300g/dr or above and a constitutional unit of 6 deniers or above, are lightly glued to each others. The virtual number of the fiber is thereby aggregated into 10 to 85% of constitutional numbers. The fiber so constituted is arranged in an axial direction, bonded with a binding material, thereby forming a reinforcement material for a rod material. Then, the reinforcement material is buried in a square concrete pillar as a rod-shaped reinforcement. According to the aforesaid construction, reinforcing effect can be improved.