How the pyramids were constructed

Ive heard this for many years. The internal structure of a number of blocks looks like Roman style "pozzoloni', If that's true, maybe the Egyptians invented concrete.

HOWEVER, many of the blocks actually show normal bedding structure. You can go to U of Penn archaeological museum site and see examples of "thin- sections" or the rock and its a sloppy mix of laminar carbonates and sand-stones, so maybe there's some truth in what you quote but its not all one or the other.

The article linked to seems a bit confused. For example:

"As if the scientific evidence isn't enough, Barsoum has pointed out a number of common sense reasons why the pyramids were not likely constructed entirely of chiseled limestone blocks."

But nobody ever said they were. The Great Pyramid of Cheops at Giza is made primarily of granite blocks: an estimated 2.3 million of them. They were used to create a stepped pyramid; the spaces between layers were filled in with limestone.

"Why, despite the existence of millions of tons of stone, carved presumably both copper chisels, has not one copper chisel ever been found on the Giza Plateau?

"Although Barsoum's research has not answered all of these questions, his work provides insight into some of the key questions. For example, it is now more likely than not that the tops of the pyramids are cast, as it would have been increasingly difficult to drag the stones to the summit."

Given the existence of granite blocks, the absence of copper chisels seems indicative of nothing of the sort.

As for dragging the stones to the top, it seems more likely to me that earth was piled up around the pyramid as each stage was built, with a long slope leading up. This would trade horizontal distance for vertical; and the earthworks would give laborers a firm base to stand on, from all sides. As each new level was constructed, the earth ramp would be elongated to ease the vertical slope. When completed the earthworks would be removed, from the top down, to reveal the completed structure.