三峡工程大坝混凝土长龄期性能试验研究

Long Age Performance Test of Dam Concrete of Three Gorges Project

通过对三峡工程大坝混凝土进行龄期长达5年的性能试验,分析了混凝土的抗压强度、抗折强度、极限拉伸变形和碳化深度,抗冻性能随龄期变化的规律,以及标准养护和自然养护条件对混凝土性能随龄期发展规律的影响,研究表明自然养护对混凝土的强度发展和长期耐久性不利。研究结论可为长期工作条件下的大坝混凝土结构安全性评价提供参考。

Based on the performance test of Three Gorges dam concrete with a long duration of 5 years,the concrete compressive strength,rupture strength,ultimate tensile deformation,carbonation depth,frost resistance properties with age change,and the influences of different curing to concrete properties with age change are analyzed herein.The results show that natural cure is negative to concrete strength development and long-term endurance.It can be as a reference to the long-term safety evaluation of concrete structures.