Carbonation-induced corrosion is one of the main causes degradation reinforced concrete (RC) structures exposed outdoor in urban environment. To prevent steel corrosion, a durability design, that considers both initiation and propagation time, fundamental importance. At this aim, resistance to carbonation rate exposure environment need be known. This paper reports coefficient 7-day cured RC spe...

Originally puzzles were not for recreation, but serious questions you might be killed if you couldn’t solve them. But in modern times, puzzles had become a sort of recreation, decreasing the seriousness and religiousness gradually. Now, the ‘rule creators’ of puzzles began to attract notice. I, as a rule creator, published a book, Kyoto University Student, Higashida’s Puzzles. I’ll show several...