Recently, several studies have being performed for the use of advanced composite materials, with the intention of overcoming some deficiencies and inconveniencies in existing materials, for example, the way they are affected by temperature. The geopolymer has high temperature resistance, higher than 1000C, good adherence to concrete and good durability, showing great potential for application in the development of new products for Structural Engineering. The present work aims to, from the dosage study, the development of geopolymeric pastes for the production of products with good thermal properties. We evaluated the thermomechanical properties of geopolymers through mechanical test before and after exposure to high temperatures. Thermomechanical results after exposure to high temperatures, showed that the geopolymers remais intact and maintaining their structural characteristics. The results showed that the microstructure showed no significant degradation to geopolymers 500ºC.