DTA/TG/DTG thermoanalytical investigation and X-ray diffractometry were carried out on hydraulic lime pastes obtained by mixtures
of thermally activated red earth with lime. Hydration reactions proceed properly mostly due to the high silica and alumina
content. In a long period of curing the paste presents calcium silicates hydrate in high quantities while there are moderate
quantities of calcium monocarboaluminate hydrate, ettringite and gehelenite hydrated. In presence of chloride, pastes lead,
after few days, a sensible acceleration of the hydration with the formation of calcium silicate hydrate and calcium chloroaluminate
hydrate. The total amount of neo-formed hydrate products in the hardened paste, indicate a development of the solidifying/stabilizing
capacity of the hydraulic binder.