Retard-bonded prestressed steel strand with controllable bonding time and bonding control method thereof: Fid-Bau Portal

Retard-bonded prestressed steel strand with controllable bonding time and bonding control method thereof

WU LIXIN

The invention discloses a retard-bonded prestressed steel strand with controllable bonding time. The retard-bonded prestressed steel strand with the controllable bonding time comprises a prestressed steel strand body in the center, an epoxy resin binding material in the middle layer and a protective sleeve on the outermost layer, wherein the epoxy resin binding material comprises epoxy resin and alatent curing agent; and the epoxy resin binding material is cured through adopting a method that the steel strand body is electrified and heated, so that the binding material is heated and rapidly cured. According to the retard-bonded prestressed steel strand and the bonding control method thereof, the pot life of the retard-bonded prestressed steel strand is prolonged, and the curing time of the binding material is not influenced by the environment temperature; after tensioning is completed, curing of the binding material can be controlled in real time according to design requirements; andthe adverse factors that the curing time of the epoxy resin binding material is not controlled, and curing is greatly influenced by the environment temperature are effectively avoided.

粘结时间可控的缓粘结预应力钢绞线，包括中心的预应力钢绞线、中间层的环氧树脂胶凝材料、最外层的保护套；环氧树脂胶凝材料包括环氧树脂和潜伏性固化剂。环氧树脂胶凝材料固化采用给钢绞线通电加热，从而使胶凝材料受热快速固化的方法。该种缓粘结预应力钢绞线及其粘结控制方法，缓粘结预应力钢绞线适用期延长，胶凝材料固化时间不受环境温度影响。张拉完成后可以根据设计需要，实时控制胶凝材料固化。有效避免了环氧树脂胶凝材料固化时间不受控制，和固化受环境温度影响大的不利因素。

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