Modifying intensification of the hardening of extruded construction gypsum nanocomposites

Abstract

The processes of controlled hardening of nanomineral gypsum binders and the formation of microstructure that allow obtaining gypsum concrete with specified technological characteristics are analyzed. Innovative approaches to the regulation of strength and water resistance of gypsum nanobinders, the main directions of increasing their durability in concretes and mortars, building constructions and products are considered. Controlled hardening nanogypsum binders is a promising 3-D additive technology. The mechanism of hardening of gypsum nanocomposites based on calcium sulfate dihydrate and semihydrate is proposed. The kinetics of the process of hydration and setting of nanobinders depending on the content of the components is studied. The increase in strength in the process of hardening of pressed gypsum nanobinders is determined by the content of dihydrate and is accompanied by an increase in the size of needle and plate microcrystals with a thickness of less than 100 nm.

Keywords

• gypsum nanobinder
• hardening
• structure formation
• semi-dry pressing