High Aluminate Cement is known almost exclusively like a refractory binder. The researches achieved in the last decades, especially in the Kerneos company (the inventor of cement Fondue, in 1908 – known under Lafarge name), have lead at interesting results, concerning the use of this binder, associated with Portland cement and calcium sulfate in complex binders, constituents of the „dry mortars”, for construction works.

In such complex binders, Calcium Aluminate Cement, himself, or by interactions with others components, give specific properties like: setting time and rapid hardening, size variation control, aesthetical qualities (non efflorescence, color stability), good resistance of corrosion, good mechanical strength, including abrasion resistance, reduction of pollution (²eco-friendly²). These properties meet the requirements imposed by applications in areas: leveling masses, ceramic tiles and natural stone adhesive, composites masses for external thermal insulations with decorative characteristics, mortars and concretes for repairs, with rapid setting, mortars with water resistance.

Considering these information, some systematic researches concerning achievement and characterization of ternary binders, in Portland cement (PC) – Calcium Aluminate Cement (CAC) – calcium sulphate (CSH_x) system, were initiated at the S.I.M.O.Na department in POLITEHNICA University from Bucharest. Complex binder masses with ranging: 10 – 80% Portland cement, 10 – 60% Calcium Aluminate Cement, 5 – 30% calcium sulphate (hemihydrates or anhydrite III) was realized. This work brings data concerning setting time and mechanical strength, of the ternary binders from Portland cement (PC) – Calcium Aluminate Cement (CAC) – calcium sulphate (CSH_x) ternary system, as information regarding size variations, during hardening.