Replies

I dunno! But here’s some links to images of quarries in Egypt:

Geopolymer Institute Website:

http://www.geopolymer.org/archaeology/pyramids/are-pyramids-made-out-of-concrete-1

Since the early eighties, Prof. Joseph Davidovits is proposing that the pyramids and temples of Old Kingdom Egypt were constructed using agglomerated limestone, rather than quarried and hoisted blocks of natural limestone. This type of fossil-shell limestone concrete would have been cast or packed into molds. Egyptian workmen went to outcrops of relatively soft limestone, disaggregated it with water, then mixed the muddy limestone (including the fossil-shells) with lime and tecto-alumino-silicate-forming materials (geosynthesis) such as kaolin clay, silt, and the Egyptian salt natron (sodium carbonate)...

American Concrete Institute has other ideas:

Searchable Abstracts of ACI Publications

Title: Ancient Egyptian Pyramids—Concrete or Rock
Author(s): Donald H. Campbell and RobertT L. Folk
Publication: Concrete International
Volume: 13
Issue: 8
Pages: 28, 30-39
Keywords: archaeology; geology; granite; limestone; microscopy; petrography; pyramids; General
Date: August 1, 1991

Abstract:

Reports evidence the authors feel invalidates the theory of a cast-in-place origin for the building stones of the Egyptian pyramids. Observable geologic evidence in the pyramid stones includes ripple lamination, repeated layering in many tiers of blocks, calcite-filled tectonic fractures restricted to individual blocks, numerous sharp cross sections of clams, fragile calcite worm tubes, and burrows formed by sea-bottom dwelling organisms. Pores in the blocks are highly irregular, not oval as theorized. Nearby quarry rocks match lithologically most of those in the pyramids and temples. Quarrymen’s tool marks are obvious in the Giza pyramid blocks and Khufu boat-pit stones, the marks appearing very similar to those found in ancient and modern quarries. Gypsum-based mortar occurs between many of the pyramid blocks. The stratification is vertical in some blocks. A zeolitic cementitious material, called “geopolymer” by Davidovits, was neither observed by light microscopy nor detected by XRD, DTA, SEM, EDXA, or chemical analysis in the sample examined. Neither was an aggregate-cement fabric observed. Seepage of “geopolymeric concrete” into the open joints between almost all underlying pyramid blocks is obviously nonexistent. Shapes and sizes of pyramid and temple blocks seem too diverse to have been cast in molds. Xenoliths and dikes were found in the granitic Khafre Valley Temple stones.

http://www.davidovits.info/

MIT supports my pyramid theory
News 23 avr 2008 Lire / Read it

The famous Massachusetts Institute of Technology, Boston, USA, is supporting my re-agglomerated stone (concrete) pyramid theory. At MIT, Professor Hobbs and two colleagues and students are experimenting the construction of a small scale pyramid using my theory.
Go to the Boston Globe article of April 22 2008 titled
A new angle on pyramids
Scientists explore whether Egyptians [...]

hmmm...that’s the article you posted, so having come full circle I can shut down the comp and go to bed...