As we all know, the pyramids in ancient Egypt were built so beautifully, largely because the stones used were not natural original stones, but mostly made of complex concrete. Everyone is puzzled about this question. Why did the ancient Egyptians use complicated concrete to make stones instead of granite rocks on the side? Isn't this a very stupid way to go further and further? In fact, I guess it is because of the following reasons.

The number of rough stones is limited.

Although granite is close to the place where the ancient Egyptians built the pyramids, you should understand that the raw materials of granite needed to build a pyramid are very huge. It may take several mountains to build a pyramid. After all, these raw materials have to be polished, forged and so on before they can make what they want. Even if it is primitive enough to build pyramids, is the idea of the Egyptians to build pyramids? This is obviously very unscientific. I think it is probably for this reason that the Egyptians gave up using granite as the original stone to build the pyramids.

2. Low technical level

Obviously, the level of ancient technology is incomparable with that of modern technology. In addition, the hardness of granite should be clear to everyone. With the strength of the ancients and those rough tools, it is impossible to polish granite into what you want. Even polishing takes a lot of time and material resources. The ancient Egyptians were obviously very clever. They know it's time-consuming and laborious. Although the pyramids are very strong, it is obviously a price they can't afford. So they resolutely gave up the idea and found another way.

3. The specific production method is simple.

Inferred from scientists and historians, in ancient times a long time ago, Egypt at that time could make materials similar to concrete. Because they saw human hair in stones, they were sure that they had invented materials similar to concrete in the Egyptian era. I infer that it is definitely easier to make such materials than to polish granite. Moreover, they can mass-produce this concrete-like material, and the cost of manufacturing this material is very low, and the cost is not high.