Articles

Study of the Genetic Formation of New Formations during the Hardening of Pozzolanic Cement with a High Content of Ash and Slag Waste of Dry Selection

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The results of physical and chemical studies of the processes of hydration and structure formation during hardening of pozzolanic cements containing dry–selection ash and slag waste from the Angren TPP as an active mineral additive are presented. It has been established that, despite the replacement of up to 50% of the clinker part, the experimental cements acquire high hydraulic activity, which ensures their grade 400–500, which is facilitated by the presence of active silica, alumina and low–basic calcium silicates in the composition of the additive, which in the process of chemical interaction with hydration products clinker minerals are involved in the formation of a dense microstructure of the cement composite.

A Review of the Failure and Damage Forms of Metals under Cyclic Loading

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The studies related to metals damage under cyclic loading as the dominant form of structural failure is reviewed. The early approaches including stress-based and strain-based as well as the later approaches of energy-based, critical plane-based and damage mechanics-based are briefed on. Recent methods including thermography, finite element, and microstructural are summarized and explained. Different phenomenon occurring under cyclic loading are explained including fatigue crack initiation, crack propagation, fretting, and buckling. This review provides insight on the underlying mechanisms of different fatigue damage types and related proposed models. In addition, it explains the different aspects of each model along with their methodology