Concrete Pyramids

Our Bible used to show ancient Egyptian laborers carrying limestone blocks to form the Pyramids. Now we are made to understand that they used concrete instead?

Concrete was poured to build the Great Pyramids about 5,000 years ago, according to controversial research, which suggests the ancient Egyptans predated the Romans by thousands of years as the inventors of concrete. Michel Barsoum, professor of materials engineering at Drexel University in Philadelphia, and colleagues report in the current issue of the Journal of the American Ceramic Society that the pyramids were constructed with a combination of carved stones and blocks of limestone-based concrete. The study, drawn on a research made in the mid-1980s by the French materials scientist, Joseph Davidovits, consists of a detailed examination of samples taken from the pyramids and their vicinity.