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Concrete Evidence

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Apr. 11th, 2012 | 05:18 pm
location: West Hurley, New York
music: Sirinu - Udite Selve

Here are a few links that touch on some evidence for the
use of a form of concrete in the construction of some of
the pyramids:

A New Angle On Pyramids:
Scientists Explore Whether Egyptians Used Concrete


MIT students under the direction of professor
Linn W. Hobbs are building a scale model to
test a contrarian theory.
By Colin Nickerson
April 22, 2008
@Boston Globe
http://tinyurl.com/d367su3

NATURE Reports on Pyramid Limestone Concrete
in NATURE, vol. 444, 793, 14 December 2006 :

Some of the massive blocks making up the great
pyramids of Giza in Egypt (pictured) are not
limestone, but a synthetic mix like concrete,
argue materials scientists.

Materials Science: Concrete Evidence

Microstructural Evidence of Reconstituted
Limestone Blocks in the Great Pyramids of Egypt
by M. W. Barsoum, A. Ganguly, G. Hug
in: Journal of the American Ceramic Society
Volume 89, Issue 12, pages 3788–3796,
December 2006
http://tinyurl.com/btnsgrk

Abstract:

How the Great Pyramids of Giza were built has
remained an enduring mystery. In the mid-1980s,
Davidovits proposed that the pyramids were cast
in situ using granular limestone aggregate and
an alkali alumino-silicate-based binder. Hard
evidence for this idea, however, remained elusive.

Using primarily scanning and transmission electron
microscopy, we compared a number of pyramid
limestone samples with six different limestone
samples from their vicinity.

The pyramid samples contained microconstituents
(μc's) with appreciable amounts of Si in combination
with elements, such as Ca and Mg, in ratios that do
not exist in any of the potential limestone sources.

The intimate proximity of the μc's suggests that
at some time these elements had been together in
a solution.

Furthermore, between the natural limestone aggregates,
the μc's with chemistries reminiscent of calcite and
dolomite—not known to hydrate in nature—were hydrated.

The ubiquity of Si and the presence of submicron
silica-based spheres in some of the micrographs
strongly suggest that the solution was basic.

Transmission electron microscope confirmed that some
of these Si-containing μc's were either amorphous or
nanocrystalline, which is consistent with a relatively
rapid precipitation reaction.

The sophistication and endurance of this ancient
concrete technology is simply astounding.

Abstract & full article available @Wiley Online
http://tinyurl.com/cg9lw4s

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