Abstract

Global industrialization generates large amount of waste which strongly affects the depositing areas and the living creatures from the surroundings. In the same time, the construction sector meets an exponential development process, resulting in materials and construction areas increase. Therefore, the need of new materials was felt worldwide. One solution that knew a rapid development, especially in this sector, was to obtain new eco-friendly materials through a mechanism called geopolymerization. True this powerful chemical reaction between a waste, rich in aluminum and silicon, and a strong alkaline solution, a tetragonal structure of Al-O-Si is obtained that possess properties comparable to those of Portland cement-based concrete. In the present paper the effect of aggregates on local fly ash based geopolymers is analyzed from the structure and mechanical properties point of view. According to this study, the aggregates strongly influence the density, compression strength and flexural strength at any age of samples.

Highlights

  • Global industrialization generates large amount of waste which strongly affects the depositing areas and the living creatures from the surroundings

  • The alumino-silicate minerals are going through multiple stages during geopolymerization process, firstly the raw material is dissolved under alkaline condition followed by speciation equilibrium, gelation and reorganization and secondly the polymerization processes take place resulting a tetrahedral network of Si-O-Al which combines O atoms to form polysialate, polysialate-siloxo or polysialate-disiloxo molecules, depending system, as follows: on the

  • There are multiple factors related to the geopolymer final structure, alkaline solution concentration influences the pores sizes and distribution, inappropriate mixing can result in a heterogeneous sample

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Summary

Geopolymers Mixed with Natural Aggregates

DUMITRU DORU BURDUHOS NERGIS1, PETRICA VIZUREANU1,4*, OFELIA CORBU2,3,4 1Gheorghe Asachi Technical University of Iasi, Faculty of Materials Science and Engineering, 67 D. One solution that knew a rapid development, especially in this sector, was to obtain new eco-friendly materials through a mechanism called geopolymerization True this powerful chemical reaction between a waste, rich in aluminum and silicon, and a strong alkaline solution, a tetragonal structure of Al-O-Si is obtained that possess properties comparable to those of Portland cement-based concrete. The large waste volume generated in days represents a serious problem for the environment as well as for the population living near storage areas of these technological processes by-products Another problem associated with the obtaining of ceramic materials, mainly of Portland cement concrete, is related to non-renewable raw materials exploitation which involve high energy consumption.

Experimental part Materials and methods Geopolymers structure
Microstructural analysis
Conclusions

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