Improving the water-resistance of binding agent based on natural anhydrite
Keywords:
galvanic sludge, modification, rheology, nano- and ultra-disperse additivesAbstract
This paper is devoted to the development of composite anhydrite binders, modified by ultra- and nanoadditives of technogenic origin. Galvanic sludge powder which contained grains of alkali-earth metals of ultra- and nanometric size was used as a modifying additive. The analysis of chemical content, proprieties and specific surface area data of the powder allowed to make the conclusion that this powder can be applied as modifier for hydratation and anhydrite binder solidification. In order to boost the activity of ultra- and nanopowder, it was exposed to thermal treatment at temperatures from 800 to 1000 °C (degrees Celsius). During research processes we identified positive influence of galvanic sludge with ultra- and nanopowders on physical, mechanical, technological proprieties and structurization of anhydrite composite. As a result the optimal concentration of ultra- and nanopowder modifiers in anhydrite composite binders was determined.References
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