Abstract
AbstractThe purpose of this work is a comparative assessment of the resistance to alternating humidification and drying (air resistance) of modified pressed composites based on gypsum binder and magnesia cement. In order to increase the water and air resistance of small-piece gypsum and magnesite products manufactured by pressing, modifying fillers were introduced into the composition of molding mixtures as secondary resources. There are investigated changes in the physical and mechanical properties of pressed modified composites, as well as their durability indicators during cyclic tests for alternating humidification and drying. The studies have shown that the methods of gypsum and magnesia binders’ modification make it possible to obtain durable materials with increased water and air resistance by pressing. Gypsum and magnesite construction products become suitable for the construction of walls of low-rise buildings, as well as partitions in rooms with a humid indoor regime manufactured by pressing according to the proposed technologies. The chemical composition and the nature of the crystallization structure of modified gypsum composites cause their better resistance to alternating stresses during cyclic humidification and drying in contrast to magnesite.KeywordsGypsum binderMagnesia bindersMolded compositesWater resistanceAir resistance
Published Version
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