Abstract
Under modern construction conditions it is important to find the ways of cost reduction without deteriorating physical&mechanical properties of construction materials and their environmental properties. That is why the construction materials on the basis of the gypsum binder remain competitive and the increase of their operation properties is one of the relevant today tasks. In this paper the authors presented a way of increasing water resistance and strength of gypsum concrete by adding ultra-disperse modifying zeolite-based additive from available raw materials. The authors find out zeolite grindability and its chemical composition. The ultra-disperse modifying zeolite-based additive is a paste dispersed in water and added into a concrete mix as water solution. When 14% of the additive is included in gypsum paste the softening factor grows from 0.31 to 0.84 while the grade strength increases by 30%, the ultimate compression strength of dry samples - by 2.5 times and amounts to 30 MPa. Studying physical&mechanical properties and the micro-structure of gypsum&concrete samples proves the efficiency of using the developed ultra-disperse modifying zeolite-based additive.
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