Abstract. To ensure compliance with historic solutions as the primary binder of dry mixes for the restoration is air lime. To date, almost all of the advantages and disadvantages of the lime-based mortars are known, and this allows implementing a scientific approach to the goal of ensuring the maximum possible durability of masonries and finishing designs. This article covers the main problems and goals faced by professionals in the field of producing dry building mixtures that are the most technologically and economically appropriate for the restoration of the historical buildings and constructions. The use of modern mineral additives opens up new prospects for improving the properties of lime dry mixtures, for both new construction and restoration works of the objects of historical heritage.

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Abstract. The modern brickwork development is related to the material quality improvement and reliability level enhancement for structures. To solve the above problem, this work substantiates moving to the probabilistic standardization of structural behavior of brickwork units taking into account the multi-level hierarchical structure. The complexity of brickwork structure is assessed experimentally on the basis of deformations of structural elements along and across the load direction. The work considers the substantiated reliability level and assurance coefficient, settable during a brickwork test in standard samples. This approach allows the considerable increase of the quality of material, reliability and failure safety of brick structures being constructed.

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The analysis of research works devoted to the study of different mineral admixtures influence on development of shrinkage deformation of cement stone is presented.There were studued strength properties and shrinkage deformation of stone from lime building solution based on binder agent with active mineral admixture. The authors give the data on the influence of active type admixture on the change of air shrinkage of stone aged up to 28 days, and the comparison of these date with plain solution content without admixtures has been carried out. It has been established that shrinkage for stone aged 28 days from mixture with metakaolin is 10 percent lower than that of stone of the same age from mixture with microsilica suspension.