If the Egyptians cast, rather than quarried and cut, at least some of the massive stones in the pyramids, rediscovery of their secrets could provide economical, nonpolluting building material alternatives for third-world countries.12 Although the idea of cast stone flies in the face of traditional Egyptology, Dr .Barsoum’s evidence adds great weight to this hypothesis and should spur further research to confirm his findings and hopefully develop modern equivalents.
http://www.answersingenesis.org/docs2007/0129casting-stones.asp
http://www.answersingenesis.org/docs2007/0129casting-stones.asp