Method for manufacturing a hydraulic binder

A hydraulic binder manufacturing method for manufacturing a hydraulic binder comprising a calcium aluminate, the method including the following steps:

• a) providing a composition comprising a lime source compound and an alumina source compound, the said composition comprising a maximum of 95% lime and alumina, and a minimum of 23% alumina, by mass relative to the total mass of dry matter of the composition;
• b) placing the composition provided in step a) in a moisture-saturated environment (medium), at a hydration temperature comprised between 40° C. and 150° C., so as to precipitate the hydrated phases comprising at least one aluminium oxide combined with a calcium oxide and with water;
• c) subjecting the precipitates obtained in step b) to a firing temperature comprised between 200° C. and 1300° C., keeping them thereat for at least 15 minutes,
• wherein in step a), the composition is in the form of a set of particles whereof the particle size distribution is defined by a reference diameter d80 that is less than or equal to 100 micrometers.