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How to Build a Pyramid

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Author Topic: How to Build a Pyramid  (Read 7977 times)
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Catastrophe
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« Reply #15 on: April 27, 2007, 03:23:49 am »

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Geopolymers, also called polysialates, are a class of amorphous aluminosilicate materialsformed near ambient temperatures. Chemically, geopolymers consist of cross-lined units ofAlO4-and SiO4tetrahedra, where charge-balancing cations are provided by alkali metal cationssuch as Li+, Na+, K+, and Cs+. Geopolymers are formed by reacting aluminosilicate materialswith highly caustic, aqueous alkaline (MOH) silicate solutions, where M= alkali cation. Duringthe synthesis of geopolymers, dissolution of the aluminosilicate precursor takes place first,followed by the cross-linking and formation of the geopolymer structure. The process of“geopolymerization” and the study of the subsequent geopolymers has been the subject of anumber of numerous studies.1-26Applications of geopolymers have included ceramic matrixcomposites,1-6waste encapsulation7-9, and alternative cements.10-19,24With the exception of Hos et al.26, the aluminosilicate precursors for the fabrication ofmonolithic geopolymers have been limited to naturally derived sources and industrial wasteproducts, e.g. fly ash, slag, raw minerals and calcined kaolin (metakaolin). In their work, Hos etal. created Al2O3-2SiO2coupons, which were heated to 1550oC, melted with an oxy-acetylenetorch, and rapidly cooled. The resulting glass, which was milled, had a surface area 15 – 16m2/g, and mean particle size of 3.2 mm.

Here is one reference to geopolymers having mean particle size of 3.2mm.

If Davidivits' geopolymer is similar it would mean pulverizing the GP to this particle size.
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