| 摘要 |
PROBLEM TO BE SOLVED: To provide a wire for reinforcing excellent fluidity and high in reinforcing effect, which is blended in cement for obtaining a cement molded object excellent in flexure strength and toughness.SOLUTION: The wire for reinforcing concrete giving high reinforcing effect by blending in concrete or mortar is obtained by drawing and arranging a twistless yarn (a core yarn) and a primarily twisted yarn (a sheath yarn), secondarily twisting in a direction opposite to the primary twist direction to be a wall twine having a form of twining wavily the sheath yarn around the core yarn, and further subjecting to resin treatment to keep a spiral form. The twistless yarn (the core yarn) is composed of a polyvinyl alcohol fiber, and the primarily twisted yarn (the sheath yarn) is composed of a high molecular weight polyethylene fiber having a weight average molecular weight of not less than 1,000,000 or a para-type all aromatic polyamide fiber.SELECTED DRAWING: Figure 1 |
