[W]e have two civilizations, one in the north that flourished during the Old Kingdom, god , agglomerated stone, [and] that in the south that flourish… - Joseph Davidovits

[G]eopolymeric cements are chemically comparable to the natural cements that bind such stones as , puddingstone, and fossil-shell .

So it started with the first pyramid in small bricks. They mastered their technology, improved the dimension of the blocks and they ended with the first pyramid of that is the rhomboidal, where the blocks are still... transported to the site, but... are becoming too big, and for the of Sneferu... they are cast, they are pound[ed] on site. We then arrive to the Giza Plateau where this technology was used for the Cheops, Chephren and Mykerinos pyramids.

In... 1983, with Joseph Sawyer as head of Lone Star's research laboratory... I started to develop early high-strength geopolymeric binders and cements based on based on both geopolymeric and hydraulic cement chemistries. Within one month Lone Star Industries Inc. formed the development company, PYRAMENT... exclusively dedicated to... this new class of cement. ...It was discovered that the addition of ground blast furnace slag, which is a latent hydraulic cementitious product, to the poly(sialate) type of geopolymer, accelerates the setting time and... improves compressive and flexural strength. The first Davidovits and Sawyer patent was filed in... 1984... The corresponding European patent... in 1985... and these... disclose our preliminary finding...of 1983. Geopolymer cements are acid-resistant cementitious materials with zeolitic properties that can be applied to long-term containment of hazardous and toxic wastes.