面板坝接缝止水体系耐久性研究

摘要

The rubber cover takes on the role of shield and the first water stop in the joint structure of concrete faced rockfill dam,and the adhesive system is the basis of water-stop. The durability of them is a critical problem because of the relation to the safety and maintenance of the dam. This paper studied the performance of GB cover by the xenon weathering test. It can be concluded that the two-layer structure design of GB Cover is ef-fective to prove the anti-aging performance of it. And the reliability of the SK primer is testified by the freeze-thaw cycle test.%面板坝接缝止水结构中橡胶盖板起到防护和第一道止水的作用，其耐老化性能直接关系到大坝的安全运行和维护工作，同时粘接体系是止水抗渗的基础，它们的耐久性是工程应用中最为关心的问题之一。根据GB盖板的使用环境，选择了氙灯气候加速老化试验对材料的气候老化性能进行了对比研究，结果表明，三元乙丙层的耐气候老化性能大大优于天然橡胶层，GB盖板的结构设计对于延长盖板的使用寿命非常有效。同时SK粘接体系冻融循环试验表明其长期粘接性能是可靠的。