From What Were the Egyptian Pyramids Constructed?


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Although it has been traditionally accepted that the Egyptian pyramids at Giza were constructed from quarried, carved and hoisted limestone blocks, an alternative theory is that the blocks were not carved, but were instead cast on the spot from a specialized form of limestone concrete. The new hypothesis suggests that a wet concrete mixture was poured from buckets into molds that were held in place on the sides of the pyramid.

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The alternative limestone-concrete theory has been met with some skepticism, but its proponents claim that a specialized mixture would have easily hardened into blocks that look like they were carved from solid limestone. The theory's supporters also claim that it provides a solution to the logistical puzzle of how more than 2 million limestone blocks, each weighing at least 2 tons, could have been set into place using the limited mechanical means available to the Ancient Egyptians more than 4,500 years ago.

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