Modeling of the high-strength clinker-free binder structure

Abstract

Modern approaches in materials science should provide a solution to the problems of energy and resource conservation. They are also called upon to develop a line of directed synthesis of composites that possess the required parameters over the entire spectrum of properties. In order to obtain a high-strength structure of a clinker-free binder, the possibility of obtaining it on the basis of natural gypsum stone is considered. As is known, the strength of crystallization structures by adhesion in contact and the number of contacts is determined. To optimize the internal structure of a high-strength clinker-free binder, to obtain the maximum number of contacts and increase their strength, the possibilities of geometric topological approaches were used. When solving such problems, the geometric parameters and organization levels of the structures of disperse systems allow topology to be described. The fundamental possibility of obtaining a high-strength composite structure through the prism of the formation of a dispersed system with a maximum number of phase contacts between crystals of calcium sulfate dihydrate is considered. The granulometric composition of gypsum stone must meet the requirements (principles) of hardening, physical-chemical model and type of structure. Therefore, in the work, the possibility of obtaining high binder strength by optimizing it in accordance with the model was studied. mixtures of two powders with different average particle sizes were used. This increases efficiency and improves the properties of the binder.

Influence of pH liquid for mixing gypsum binders on the strength of gypsum composites

“…However, not all parameters of composite gypsum materials are regulated, since they do not directly affect the properties of materials, but indirectly, changing other parameters. Among these is the acidity of the mixing solutions, which directly affects the structure formation processes of gypsum stone (crystal distribution, their morphology) and, as a result, the strength indicators, their growth rate, and the quality of the materials obtained [15]. It should be noted that the effect of the pH of the mixing liquid on composites containing anhydrite, α and β modifications of hemihydrates is not the same, due to the different mechanism of their hydration.…”