Abstract. The paper discusses the reasons for the decrease in the strength of the composite material in relation to the theoretical. A hypothesis is put forward according to which, along with the known reasons; in particular, the presence of internal interfaces, and together with them, the processes near the forming geometric features that arise during the structure formation of the binder paste can act as reasons for the decrease in strength. To simulate the occurrence of features in composite binder paste, the concept of the local formation of new growth on the nuclei of a new phase present in the binder paste ‒ layers of a hydrated binder on the surface of its grains ‒ is used. According to the proposed model, the growth of a new phase occurs according to the mechanism associated with the formation of a wave front. The wave front also undergoes metamorphosis, as a result of which its features are formed, near which structural defects are concentrated. Another type of geometric features is hidden interfaces, which are formed as a result of opposite growth of wave fronts and their contact. The proposed mechanism is confirmed by the data of a microscopic study of the processes of s
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