[en] Aluminum alloy remains in the Low-level Radioactive Waste (LLW) generated at nuclear facilities. It is well known that aluminum reacts to the alkaline component of cement, or water, generating hydrogen gas. For the safe management of radioactive waste disposal facilities, it is necessary to evaluate the corrosion behavior of aluminum and the hydrogen generation behavior in consideration with transition of the burial environment. In the present study, the corrosion behaviors of aluminum in the alkaline solutions at 15degC were evaluated. Pure aluminum was used as specimen. The test solutions used in this study were water in equilibrium with the cement paste grain produced from ordinary portland cement (OPC). The temperature and pH of solutions were 15degC and 11.5 - 12.5, respectively. In order to make a corrosion product on the surface, the specimens were immersed in the solution for about 3000 hours as pretreatment. The corrosion behaviors of pre-filmed specimen were evaluated after wet and dry storage. The wet storage before the immersion test does not affect the corrosion rate of specimens. The influence of the redox environment on the corrosion rate of specimen after dry storage was not observed. The two-layer films were formed on the specimen after the immersion tests under both conditions. Although the film might be cracked by the dry-shrinkage etc. during dry storage, it was supposed in the circumstance where the humidity was maintained that there was little generation of a crack. (author)