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本文介绍从试验中所探求不同温度、时间对冷令拉螺纹尢_5及25ΓC钢筋的时效影响,及钢筋在应力状态下时效发展的性能,冷拉螺纹尢_5及25ΓC钢筋张拉到流限时的松弛数值。试验证明尢_5及25ΓC在应力状态下可以发生时效作用,所以冷拉后可直接应用,在先张法预应力混凝土构件中,可以利用蒸汽养护混凝土,同时对钢筋进行人工加热时效;在张拉冷拉“尢_5”及25ΓC预应力筋时,为取得较大的预应力值,可以将控制张拉力提高到流限值。
This article describes from the experiment to explore the different temperatures and time on the cold-pull thread particularly _5 and 25ΓC steel aging effect, and the reinforcing steel in the stress state aging development performance, cold-pull thread especially _5 and 25ΓC steel tension to flow Time-lag relaxation value. Experiments show that especially __5 and 25_C can occur in the stress state of aging effect, so the cold-drawn can be directly applied to the pre-tensioned prestressed concrete components, you can use steam curing concrete, while the artificial aging heating; aging To pull the cold pull “You _5 ” and 25ΓC prestressed tendons, in order to obtain a larger prestress value, you can control the tension to raise the flow limit.