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In this article, the influence of the andradite on the mechanical resistance synthesized from the furnace slag converter is evaluated. As activators, 12 M sodium hydroxide and 5 M sodium silicate were used. Sodium hydroxide remained constant at 5% and at 15% in sodium silicate. Ceramic material was added in proportions of 5%, 10%, 15% and 20%. The curing of the paste was done at room temperature for 24 hours. The particle size of the white slag and the ceramic material was 150 Î?m. XDR and MEB were used to analyze the possible mechanisms of formation of andradite and calcium carbonate. Samples were failed in the universal testing machine. The influence of the chemical compounds formed on the compressive strength was determined. The results indicate that the proposed conditions are suitable for the formation of crystalline structures characteristic of geopolymeric materials. [ABSTRACT FROM AUTHOR]

Heavy metal pollution is a problem, that to date has not been mitigated. For this reason, it is necessary to constantly innovate among traditional techniques in order to be able to apply efficient processes in such a way that contaminants can be removed or even recovered to be reincorporated into productive processes. In this context, adsorption is such a versatile technique that its application with materials of different characteristics is viable. Among the materials that have been characterized as efficient adsorbents, are inorganic particles and polymers/biopolymers. These components by themselves have acceptable adsorbent capacities, but in recent years the generation of polymeric matrices in the hydrogel state reinforced with inorganic materials or mixtures of polymeric networks generating composites has been explored to improve or increase the adsorption capacity. Composite hydrogels combine effective adsorption, high specific surface area and easy applicability, so they represent a great alternative for the elimination of heavy metal ions present in aquatic ecosystems. For this reason, the review of the state of the art of materials with adsorbent properties is carried out, as well as the strategies to generate composites in a hydrogel state with properties adapted for the adsorption of heavy metal ions, also contemplating the challenges and areas of opportunity related to generation of this type of innovative materials. [ABSTRACT FROM AUTHOR]

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The subject of our thesis was the examination of the alkaline activated inorganic polymers. In the course we prepared different compound, new-type binder material systems, and we examined mechanics and physical characteristics of these models. Our first target was to determine the optimal liquid component compound, then we examined quantity of filler component which can be given to the dust component. Following this we defined the proportion of a liquid and firm components compared to each other. In the course of our work we prepared metakaolinit-based geopolymers, we used standard sand as filler. In the course of the experiments we worked with NaOH and waterglass's mixture as liquid component. We examined flexual strength, hydration, apparent density, apparent porosity of the prepared models in the function of compounds. According to results we succeed in determining the optimal liquid compound and ration of liqiudfirm component. [ABSTRACT FROM AUTHOR]