| 摘要 |
Steel materials for use with concrete that is prestressed by posttensioning are disclosed. in accordance with one embodiment of the invention, a steel member is sheathed with a heat-shrinkable synthetic resin tube. in another embodiment, the steel member is sheathed with a foamed synthetic resin tube. Both embodiments are further applicable to the case of a stranded steel member, in which case it is preferred that the spiral grooves of the stranded member be filled with a resin before sheathing with an external tube. |
