I want to build a two-and-a-half-story house by myself. It's a water pile! The diameter of the pile is 60 cm .. 25 meters deep! How much cement and the ratio of pebbles are needed for each pile?

Strictly speaking, self-built houses are not as fine as high-rise buildings, and their strength is only due to conservative considerations of earthquake resistance, wind resistance and durability. In your case, the weight ratio of cement is 300, that of sand is 6 10, and that of stone is 1200. There may be fewer stones now, but it doesn't matter much. When it's all done, don't worry. In the past, there was no refined steel on the second floor, and the cement would not fall for a hundred years. If it is a frame structure, it is even more no problem.