Журнал географии и стихийных бедствий
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Development of green fly ash geopolymer for sustainable construction: A journey from green house to green home through bacterial catalyst

Brajadulal Chatopadhyay

Production of cement releases huge CO2 (about 5-7% of total CO2 emission) in the atmosphere andcauses global warming. Fly ash is a coal combustion by-product that leads to many environmental problems like ground water contamination, spills, heavy metal contamination etc. The uses of different chemicals and additive in concrete composites also sometimes cause health problems which are environmentally unacceptable. Microbiologically incorporated cementitious materials to recuperate the activities and toughness of the concrete structures are a new aspect of research work in the current era. In this study we have designed an eco-friendly bio-engineered Geopolymer by incorporating genetically transformed Bacillus subtilis bacterium to an alkali- activator treated 100% Fly ash material. A novel gene responsible for a thermo stable and high pH tolerant silica leaching enzyme (Bioremediase like; M.W. ~ 28KDa) isolated from hot spring bacterium BKH2 has been utilized for production of high performance Geopolyme