The Doctoral Thesis “The synthesis of hydraulic binder suitable for restoration of dolomitic roman cement objects” researches the synthesis of hydraulic binder in system clay – dolomite, that based on compatible chemical and physical properties would be suitable for restoration purposes of historical dolomitic Roman cement objects. The Doctoral Thesis consists of an introduction, three main chapters (Literature Review, Methods, Experimental Results and Discussion), conclusions, a list of sources used, and appendices. The literature review, covering a period from 1930-ties till 2015, summarizes information on the fabrication methods and properties of Roman cement – significant historical hydraulic binder. Separately explained the history of dolomitic Roman cement production in territory of Latvia, as well as the properties that distinguishes dolomitic binders from calcitic ones. The second chapter describes the materials and methods used to achieve the aims of the Doctoral Thesis. At the beginning of Experimental part of thesis, chemical investigation of binders of several historical mortars of Latvia is done. The main part of the Thesis is dedicated to the synthesis of binder compatible with historical dolomitic Roman cement from mixture of dolomite flour and clay for restoration purposes. The effect of composition of raw materials and firing temperature on the mineralogical and physico-chemical properties of synthesized binder is studied. The physico-chemical, physical and mechanical properties of obtained material are characterized, as well as the hydration process of it. The synthesised binder is compared with similar commercially available binder that considering its properties could be one of most appropriate materials for restoration of Roman cement. The Doctoral Thesis has been written in Latvian and comprises an introduction, three chapters (literature review, methodological part, experimental part), conclusions and bibliography with 93 reference sources. It has been illustrated by 73 figures, 10 tables and 27 equations. The volume of the present Doctoral Thesis is 129 pages, including 6 appendices.