S D Muduli, J K Sadangi, S M Mustakim, B D Nayak and B K Mishra
Accepted Abstracts: Material Sci Eng
There is an increasing demand of building material industry due to industrialization and urbanization. The purpose of this research work is to develop innovative environment friendly building brick without any hot air curing and to study their performance, particularly on different critical condition. Considering the reaction path of geopolymerization process, a suitable alkaline activator has been developed with different Na2O/(Al2O3+SiO2) of 0.025- 0.078 named as GeochemTM. The GeochemTM activator is an alkaline solution of sodium hydroxide and sodium silicate in presence of water consisting of Cland SO4 = anions. The pH of the chemical activator consisting is above 11.5. The concentration of anion group chemicals in the activator is maintained depending on the chemical constitution of the oxides and silicates of aluminum, calcium, magnesium, iron bearing mineral phases. During this research work building brick of 230 Î 110 Î 75 mm size are manufactured. The fly ash mix consisting of Na2O/(Al2O3+SiO2) ratio above 0.038 shows a remarkable increase in the strength. The strength gradually increases as the curing duration increases from 5 to 25 days. The substantial increase of strength of fly ash mix is due to the increase of alkali concentration and formation of alkaline alumino-silicate phases. The X-ray diffraction analysis data shows analcime, sodalite, cancrinite, natrolite, herschelite, and mullite, as predominant mineral phases. These mineral phases with different cation and anion substitution grow into amorphous to crystalline structures by dissolution and solidification. Intercoordination of the polymerized minerals helps in the build-up of the binding strength.
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