Sumitomo (Sei) Steel Wire Corp.

Nippon Paint Compnay, Ltd.

Toshihiko Niki

Yoshihiko Touda

Tomoya Maekawa

Katsuhito Oshima

Tomoyuki Hirai

Takashi Ichiki

Yoshitaka Ishihara

Koichiro Natori

Takayuki Yamagiwa

A powder coating composition for PC strand coating which, when used for the coating of a PC strand, can advantageously form a coating film having an even thickness at low cost without causing uneven thickness or stringness is disclosed. The powder coating composition of this invention for PC strand coating is characterized by having a melt viscosity of 3,000-15,000 poise.

Powder coating composition for PC strand coating, coating method, and coating film

There is provided a strand that can reduce the trouble in constructing an object to which compression force is applied by the strand and that can keep the construction cost down. A strandis placed in a bore hole provided in a wall or roof surface, and is gripped by a wedge in a tensioned state so as to apply a tensile force to the wall or roof surface. The strandof the present invention includes a pipe-shaped member (corrugated tube) made of metal, and a plurality of metal wiresarranged on the outer periphery of the corrugated tubeThe metal wiresare arranged to surround the corrugated tubeon the cross section of the corrugated tube

Strand

In one aspect, the present disclosure relates to a high-strength prestressing strand having a seven-wire structure in which one core wire and six outer wires are stranded. An external diameter of the strand is from 15.0 mm to 16.1 mm, a total cross-sectional area of the strand is 135 mmor more, and a load at 0.2% permanent elongation is 266 kN or more. A relaxation value measured after a 1000-hour relaxation test is 2.5% or lower and a diameter of the core wire is 5.35&#xb1;0.3 mm and a diameter of the outer wires is 5.15&#xb1;0.25 mm. The core wire and the outer wires each have a composition of at least 0.90% carbon. The prestressing strand is manufactured by stranding the core wire and outer wires, giving a stretching treatment, and giving a bluing treatment at a temperature of 380&#xb0; C. or more and 430&#xb0; C. or less after or at the same time with the stretching treatment.

High-strength prestressing strand, method for manufacturing the same, and concrete construction using the same

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Itami, Japan

Toshihiko Niki