Abstract: In order to study the macroscopical performance evolution of dam concrete, the pore structure feature of different parts in the core samples were analyzed by field sampling from two concrete dams. By compression and pressure mercury test, the comparison between theoretical results of compressive strength and test data of core samples had been carried out. This research shows that there is an obvious spatial correlation in the performance evolution of dam concrete and a certain correspondence between the pore structure and strength of dam concrete at a certain age. It is feasible to use the pore structure of concrete to characterize the long age compressive strength of dam concrete. The research in this paper can provide a basis for further study on the performance evolution of dam concrete.

Key words: concrete, mercury intrusion porosimetry, long-age compressive strength, pore structure

摘要： 为了研究坝体混凝土宏观性能的演化规律，对两座混凝土坝进行现场取样，通过抗压试验和压汞试验，分析了芯样不同部位的孔结构特征，并将抗压强度的理论结果和试验数据做了对比。研究结果表明坝体混凝土的性能演化具有明显的空间相关性，坝体混凝土某一龄期的孔结构与该龄期的强度有一定的对应关系，采用孔结构表征坝体混凝土的长龄期抗压强度是可行的。文章的研究成果可为深入研究坝体混凝土的性能演化提供依据。

关键词: 混凝土, 压汞试验, 长龄期抗压强度, 孔结构