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Materials engineers from Islamic Azad University in Iran obtained the optimum conditions of strength in the geopolymers which are made of waste materials such as rice paddy ash and furnace ash by studying the effect of silicon and alumina nanoparticles on their compressive strength.
Geopolymers are required to be cooked in furnaces for a long time in order to acquire high strength. In such conditions, the strength increases significantly. Big structures require large furnaces. Therefore, the application of such materials is limited.
Taking into consideration the unique properties of silicon and alumina nanoparticles, the researchers succeeded in increasing the strength of geopolymers by using such nanoparticles. This method of geopolymer strengthening does not require a furnace.
Results of the research show that the presence of nanoparticles in the base of the geopolymers increases their strength. Moreover, the use of soda in addition to such nanoparticles maximizes the increase in the strength.
The results of the research can be directly used in road construction and building industries and also in the production of wastewater pipes. Such materials can be appropriate substitutes for the pre-prepared concrete objects. They can also have application in the materials that require maintaining their strength when they are imposed to fire.
Results of the research have been published in August 2012 in Ceramics International, vol. 38, issue 6. For more information about the details of the research, visit the full text of the article on pages 4467-4476 in the same journal.
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