Giza blocks “are not natural limestone”

by Damien F. Mackey The sample chemistries the researchers found do not exist anywhere in nature. “Therefore”, Barsoum said, “it's very improbable that the outer and inner casing stones that we examined were chiseled from a natural limestone block”. Though I am no technician, I had been very impressed by the theory of the French polymer scientist, professor Joseph Davidovits, Director of the Geopolymer Institute in St. Quentin, France, who had been claiming that the stones of the Giza pyramids were actually made of a very early form of concrete, or liquid (wet) cement, created using a mixture of limestone, clay, lime, and water. According to the Wikipedia article, for a basic view on the professor (http://en.wikipedia.org/wiki/Joseph_Davidovits): Davidovits was not convinced that the ancient Egyptians possessed the tools or technology to carve and haul the huge (2.5 to 15 ton) limestone blocks that made up the Great Pyramid. Davidovits suggested that the blocks were molded in place by using a form of limestone concrete. According to his theory, a soft limestone with a high kaolinite content was quarried in the wadi on the south of the Giza plateau. It was then dissolved in large, Nile-fed pools until it became a watery slurry. Lime (found in the ash of ancient cooking fires) and natron (also used by the Egyptians in mummification) was mixed in. The pools were then left to evaporate, leaving behind a moist, clay-like mixture. This wet "concrete" would be carried to the construction site where it would be packed into reusable wooden molds. In the next few days the mixture would undergo a chemical hydration reaction similar to the setting of cement. Using Davidovits' theory, no large gangs would be needed to haul blocks and no huge and unwieldy ramps would be needed to transport the blocks up the side of the pyramid. No chiseling or carving with soft bronze tools would be required to dress their surfaces and new blocks could be cast in place, on top of and pressed against the old blocks. This would account for the unerring precision of the joints of the casing stones (the blocks of the core show tools marks and were cut with much lower tolerances). Proof-of-concept experiments using similar compounds were carried out at Davidovits' geopolymer institute in northern France. It was found that a crew of ten, working with simple hand tools, could build a structure of fourteen, 1.3 to 4.5 ton blocks in a couple of days. According to Davidovits the architects possessed at least two concrete formulas: one for the large structural blocks and another for the white casing stones. He argues earlier pyramids, brick structures, and stone vases were built using similar techniques. [End of quote] However, as there appeared to be amongst mainstream pyramid experts little interest - to practically none whatsoever - in what seemed to my mind to be the eminently sensible and scientific thesis of Davidovits, and since I personally did not have the sort of scientific expertise to push the case of the matter, I have tended to lose interest in the theory until now. This was not because I am unprepared to back a supposed rogue ‘maverick’ against the mainstream flow of conforming scholars. My acceptance of the revision of ‘maverick’ scholar, or ‘wayward polymath’, Dr. Immanuel Velikovsky (Ages in Chaos series), against the conventional view of chronology, is clear evidence of this. Anyway, my interest in the theory of Davidovits has been rekindled by the following article in support of it: http://www.livescience.com/1554-surprising-truth-great-pyramids-built.html The Surprising Truth About How the Great Pyramids Were Built telling about the discovery along the same lines by one Michel Barsoum, described therein as “a well respected researcher in the field of ceramics”, and “a distinguished professor in the Department of Materials Science and Engineering at Drexel University”. The authors of this article, Sheila Berninger and Dorilona Rose, write about how Barsoum, initially as a sceptic, came to reconsider the whole matter: …. Barsoum received an unexpected phone call from Michael Carrell, a friend of a retired colleague of Barsoum, who called to chat with the Egyptian-born Barsoum about how much he knew of the mysteries surrounding the building of the Great Pyramids of Giza, the only remaining of the seven wonders of the ancient world. The widely accepted theory — that the pyramids were crafted of carved-out giant limestone blocks that workers carried up ramps — had not only not been embraced by everyone, but as important had quite a number of holes. Burst out laughing According to the caller, the mysteries had actually been solved by Joseph Davidovits, Director of the Geopolymer Institute in St. Quentin, France, more than two decades ago. Davidovits claimed that the stones of the pyramids were actually made of a very early form of concrete created using a mixture of limestone, clay, lime, and water. "It was at this point in the conversation that I burst out laughing," Barsoum said. If the pyramids were indeed cast, he said, someone should have proven it beyond a doubt by now, in this day and age, with just a few hours of electron microscopy. It turned out that nobody had completely proven the theory … yet. "What started as a two-hour project turned into a five-year odyssey that I undertook with one of my graduate students, Adrish Ganguly, and a colleague in France, Gilles Hug," Barsoum said. [End of quote] The article goes on to explain some of the geology of the matter, “these blocks are not natural limestone”, and to account for what has puzzled Egyptologists over a long period of time: namely, the high water content: A year and a half later, after extensive scanning electron microscope observations and other testing, Barsoum and his research group finally began to draw some conclusions about the pyramids. They found that the tiniest structures within the inner and outer casing stones were indeed consistent with a reconstituted limestone. The cement binding the limestone aggregate was either silicon dioxide (the building block of quartz) or a calcium and magnesium-rich silicate mineral. The stones also had a high water content — unusual for the normally dry, natural limestone found on the Giza plateau — and the cementing phases, in both the inner and outer casing stones, were amorphous, in other words, their atoms were not arranged in a regular and periodic array. Sedimentary rocks such as limestone are seldom, if ever, amorphous. The sample chemistries the researchers found do not exist anywhere in nature. “Therefore”, Barsoum said, “it's very improbable that the outer and inner casing stones that we examined were chiseled from a natural limestone block”. More startlingly, Barsoum and another of his graduate students, Aaron Sakulich, recently discovered the presence of silicon dioxide nanoscale spheres (with diameters only billionths of a meter across) in one of the samples. This discovery further confirms that these blocks are not natural limestone. [End of quote] The article then comes to the same dramatic (and somewhat poignant) conclusion arrived at also by chronological revisionists along the lines of Dr. Immanuel Velikovsky (though not intended by the authors of the article): We have been misled. Generations misled At the end of their most recent paper reporting these findings, the researchers reflect that it is "ironic, sublime and truly humbling" that this 4,500-year-old limestone is so true to the original that it has misled generations of Egyptologists and geologists and, "because the ancient Egyptians were the original — albeit unknowing — nanotechnologists." As if the scientific evidence isn't enough, Barsoum has pointed out a number of common sense reasons why the pyramids were not likely constructed entirely of chiseled limestone blocks. Egyptologists are consistently confronted by unanswered questions: How is it possible that some of the blocks are so perfectly matched that not even a human hair can be inserted between them? Why, despite the existence of millions of tons of stone, carved presumably with copper chisels, has not one copper chisel ever been found on the Giza Plateau? Although Barsoum's research has not answered all of these questions, his work provides insight into some of the key questions. For example, it is now more likely than not that the tops of the pyramids are cast, as it would have been increasingly difficult to drag the stones to the summit. Also, casting would explain why some of the stones fit so closely together. Still, as with all great mysteries, not every aspect of the pyramids can be explained. How the Egyptians hoisted 70-ton granite slabs halfway up the great pyramid remains as mysterious as ever. [End of quote] Whilst ignorance in such cases can be to some degree simply a natural outcome of pioneering efforts to reach right conclusions about an overwhelming mass of early evidence, Velikovskian-inspired revisionists would be well aware, too, of another common factor that is inexcusable: the persistence by mainstream scholars to proceed in the face of hard evidence. On this sad phenomenon, see e.g. my article: Dumb and Dumbfounded archaeology (8) Dumb and Dumbfounded archaeology | Damien Mackey - Academia.edu