Dolomitic Roman cement was a widely used binder for construction purposes during the late 19th and early 20th century in the territory of Latvia. Because of its hydraulic properties and fast setting, it was especially favorable for the use in cast elements of Art Nouveau style facades. The production of the material was discontinued in the middle of the 20th century. Nevertheless, there is a need for a compatible material for restoration purposes. Such material is not currently commercially available. A compatible binder was synthesized from mixture of dolomite flour and clay. This research gives an insight in the ongoing chemical processes during the hydration of the cement minerals in the binder. The influence of clay content in compositions and of firing temperature on the physico-chemical properties and mineralogical composition of the obtained material is estimated.