A special type of double folded steel tube when expanded with high water pressure generates contact frictional and mechanical interlock between steel tube and surrounding rock giving full column rock reinforcement. This type of rock bolt is used for rock reinforcement in structure and tunnel support. It has good mechanical properties such as high tensile strength of 240kN and good elongation, which are important to support the rock and also overcome the rock slips in the tunnel. After the closure of Yucca Mountain (YM) nuclear repository, there are different periods based on the temperature.  First being the dry out period, where the temperature raises to around 200^oC due to heat from radioactive decay and then followed by transition and low temperature periods.  In this research, we are studying the corrosion rate and localized corrosion mechanism of this special kind of AI* rock bolt in different YM ground or pore waters in transition and low temperature periods.  

* The rock bolt of the research is in the as inflated stage. Hence, in short it is abbreviated at AI.