Practical Application of the Similarity Law of Structures in the Reconstruction of the Surface Layer of Bricks

Abstract

This paper discusses the results of experimental studies on the selection of the repair mixture compound for recreating the surface layer of the historical brick of the 18th century architectural monument “Commercial Bank” in Arkhangelsk. According to the research results, it was found that the historical brick has a relatively higher density and increased calcium content than the modern one. The characteristics of the surfaces of the analyzed materials based on the component indicators of specific surface energy showed that the brick of 1859, characterized by the highest degree of destruction, has the maximum value of the polar energy component. This fact may indicate a greater hydrophilicity of the surface in relation to atmospheric water and, as a result, a more intensive degradation process. It is established that the composition of the repair mixture with the addition of brick crumbs in the amount of 50 % has a value of the polar part of the surface tension equal to similar parameters for historical bricks (1786 and 1859) after their preliminary priming. The use of this mixture to recreate the surface layer of the brick will allow atmospheric water to pass freely through the repair compound and the body of the brick, without concentrating on the interface and without causing its destruction and detachment when drying.

Experiments on Material Proportions for Similar Materials with High Similarity Ratio and Low Strength in Multilayer Shale Deposits

“…Similar materials and raw model materials need to follow similarity criteria, determining their similarity conditions according to the character-istics of the research object, meeting the similarity in geometric characteristics, physical and mechanical properties, deformation characteristics, etc. of similar materials [23,24]. The similarity model and prototype should meet the similarity conditions in the structure and its failure characteristics, boundary conditions, elastic-plastic stress state, time, etc.…”