Abstract
Sustainable development of construction materials is directly related to research on the processes of hydration of binders. Builders need better types of cement, with lower cost and energy consumption in production. The development of spin chemistry methods allows us to consider the processes of hydration and structure formation of binders from the spin state of the elements involved in chemical reactions. Magnetic interactions have a significant effect on the spin dynamics and the control of the spin multiplicity of radical pairs. The practical implementation of magnetic effects on a binder can be carried out in various ways. However, a long-term impact can be achieved only by introducing ferromagnetic substances into the binders. In the paper presented the results of a study of the influence of the characteristics of finely dispersed powdered ferromagnetic additives on the strength characteristics of cement. Ferromagnetic additives regulate the behavior of the reactants during rotation during the hydration of the binders due to magnetic interactions and control the reactivity of the chemical reaction. A comparative analysis revealed that it is most expedient to use as powdery ferromagnetic additives are the waste from mining and processing enterprises of the Krivorozhsky field. The work investigated the magnetic and dispersed characteristics of 12 different dust. The experiments showed that the origin of dust and the method of their capture are determined their magnetic characteristics. Preparation of samples with the dust and determination of the strength characteristics of cement were carried out by standard methods. The results obtained made it possible to reveal the laws of the effect of the dispersed and magnetic properties of various dust on the degree of activation of binders.
Highlights
Cement is one of the most essential currently used building materials
After mixing the cement with water, is formed a cement paste, which begins to harden after 40 minutes and turns into a cement stone after 6 hours
The intensive development of spin chemistry methods allowed us to consider the processes of hydration and structure formation of binders in juxtaposition with the spin state of the elements involved in chemical reactions [1]
Summary
Cement is one of the most essential currently used building materials. The main components for the production of cement are clay and limestone. The interpretation of the processes occurring during the hardening of the cement paste is based solely on charges. It assumed that during the solidification of binders, the forces of electrostatic nature are decisive since the particles of the new phase are not neutral. Because of the orientation of the dipoles of the dispersion medium adsorbed on their surface, they acquire a particular charge Despite numerous studies, this approach has not yet been able to reveal the true nature of the forces leading to the strengthening of the structure and the synthesis of the strength of cement stone and to create a unified and universally accepted theory of hardening of cementitious systems
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