Fracture mechanisms of layered materials in structures of cultural heritage objects
EDN: CORCOI
Abstract
Introduction. In contrast to homogeneous materials, fracture of layered masonry systems starts throughout the entire volume and not from the surface. This is due to a special boundary space emerging at the layer junction with the properties significantly different from those of both contacting materials. Despite the considerable number of works devoted to the features and patterns of its formation, the boundary space as a key factor in the fracture of the masonry system as a whole is still little touched upon.
Aim. To develop an approach to the facture mechanisms of layered porous masonry systems in cultural heritage objects operated for a long time.
Materials and methods. The presented model analyzes the main physical fracture mechanisms in the interlayer boundary space of the masonry system.
Results. Areas of sharp pore changes block transport of liquid and its evaporation. Impurities contained in the liquid medium and accumulated in the evaporation zone reduce the pore size and eventually contribute to the initiation of shrinkage-deformation (sorption) and crystallization mechanisms of fracture.
Conclusions. The facture processes in layered masonry systems are determined by the initial existence and further development of internal evaporation zones. These microzones are associated with boundary areas abundant at the layer junctions within the structure. In this regard, fracture processes develop simultaneously throughout the entire volume of the structure, being limited only to areas inaccessible for direct moistening. Thus, the fracture of layered masonry systems is self-developing and mainly determined by the access of a liquid medium.
About the Authors
E. V. SheikinRussian Federation
Evgenii V. Sheikin*, Sectoral Head, Sector for Diagnostics of Moisture and Structural Condition of Structures, Central Scientific and Restoration Project Workshops; Applicant, JSC Research Center of Construction, Moscow
Shkolnaya str., bld. 24, Moscow, 109544, Russian Federation; 2nd Institutskaya st., 6, bld. 1, Moscow, 109428, Russian Federation
e-mail: evg.sheykin@gmail.com
V. F. Stepanova
Russian Federation
Valentina F. Stepanova, Deputy Head for Research, Laboratory of Corrosion and Durability of Concrete and Reinforced Concrete Structures, Research Institute of Concrete and Reinforced Concrete named after A.A. Gvozdev, JSC Research Center of Construction, Moscow
2nd Institutskaya str., 6, bld. 5, Moscow, 109428, Russian Federation
e-mail: vfstepanova@mail.ru
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For citations:
Sheikin E.V., Stepanova V.F. Fracture mechanisms of layered materials in structures of cultural heritage objects. Bulletin of Science and Research Center of Construction. 2025;45(2). EDN: CORCOI
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