sentences:  Water is present only at temperatures below 150 °C – 200 °C, essentially in the form of -OH groups, whereas numerous geopolymer industrial and commercial applications work at temperatures above 200 °C, up to 1400 °C, i.e.at temperatures above dehydroxylation.Nevertheless, scientists working on low temperature applications, such as cements and waste management, tried to pinpoint cation hydration and water molecules.