Structure Formation in Binders from Activated Acid Fluoride Raw Materials

The current problem of modern science and construction is a complex processing of mineral raw materials involving secondary raw materials. It saves natural resources and helps to solve environmental problems. However, heterogeneity of secondary raw materials in terms of chemical, mineralogical, and grain size distribution slows down the process of recycling acid fluoride raw materials. To produce building compositions with the required parameters in gypsum-containing systems, it is necessary to create the best crystallization conditions, including crystallization rate (kinetics of structure formation). To determine the time and conditions of crystallization, it is necessary to establish the relationship between the kinetics of structure formation and their phase composition, that is, the content of solid, liquid and gas phases in order to increase the solid phase concentration.
Methodology/approach: The differential microcalorimetry and volumetric phase characteristics are used to study the acid fluoride structure. These methods have not been previously used to study the hydration process of binders from activated acid fluoride raw materials in order to predict the kinetics of hydration and solidification.
Research findings: The paper analyzes the mechanism of hydration and hardening of acid fluoride binders according to the heat release kinetics and physicochemical methods, which confirm that hydration of acid fluoride binder is accompanied by the initial formation of colloidal solution of initial hydration products and subsequent crystallization of the obtained products. The process duration and intensity depends on the type and amount of the introduced additivesactivators. The hydration processes in the system is accompanied by a decrease in the free pore space, the system compaction. The structural properties of the final state are predetermined not only by the initial state, but also the mineralogical composition, dispersion, time and conditions of hardening.

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