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缓粘结预应力混凝土结构固化期间的受力性能与缓粘结预应力钢束的粘结性能密切相关。为此,本文进行了缓粘结预应力钢束的拉拔试验,探明缓粘结剂固化度(邵氏硬度值)对缓粘结预应力钢束粘结性能的影响。试验分2个阶段进行,首先,将缓粘结剂用恒温箱升温加速固化,确定了3种温度条件下缓粘结剂完全固化时间。然后制作30块尺寸为200×200×600带有预应力钢束的混凝土试块,分成10组,在同一升温条件加速固化,进行不同固化程度下的缓粘结预应力钢束拉拔试验。试验结果表明,缓粘结剂随着温度的升高,达到完全固化的时间缩短;固化度(邵氏硬度值)越高,钢束的滑移量越小,缓粘结剂对钢束的粘结性能越好。
The behavior of slow-bonding prestressed concrete structures during curing is closely related to the bonding behavior of slow-bonding prestressed steel beams. In this paper, the pull-out test of slow-bonding prestressing tendons was carried out to find out the effect of slow curing (Shore hardness) on the bonding properties of slow-bonding prestressed steel strands. The test was carried out in two stages. First, the slow-curing binder was accelerated and cured by a constant temperature oven, and the complete cure time of the slow-curing binder under the three temperature conditions was determined. Then, 30 pieces of concrete specimens with 200 × 200 × 600 prestressed steel strands were made and divided into 10 groups. The specimens were accelerated and cured under the same heating conditions, and then subjected to the pull-out test of the slow-bonding prestressed steel strands under different curing degrees. The experimental results show that the slow curing time of the slow binder increases with the increase of temperature, and the longer the curing degree (Shore hardness), the smaller the slippage of the steel bundle. The better the bonding performance.