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Geopolymers  are  inorganic  polymers  which  can  be  produced  by  the  reaction between  silico  aluminate  oxides  and  alkali  silicates  in  alkaline  medium.  Materials containing silica  and  alumina  compounds  are  suitable  for  geopolymer  production.  These  can  be primary materials or industrial wastes, i. e. fly ash, metallurgical slag and red mud. \ud    In  this  paper,  the  results  of  the  systematic  experimental  series  are  presented  which  were \udcarried  out  in  order  to  optimize  the  geopolymer  preparation  process.  Fly  ash was  ground  for \uddifferent  residence  time  (0,  5,  10,  30,  60  min)  in  order  to  investigate  the  optimal  specific \udsurface  area.  NaOH  activator  solution  concentration  also  varied  (6,  8,  10,  12,  14  M). \udFurthermore,  sodium  silicate  was  added  to  NaOH  as  a  network  builder  solution.  In  this  last \udserie different  heat  curing temperatures (30, 60, 90°C) were also applied. After seven days of \udageing  the  physical  properties  of  the  geopolymer(compressive  strength  and  specimen \uddensity)were measured. Chemical leaching tests on the rawmaterial and the geopolymers were \udcarried out to determine the elements which can be mobilized by different leaching solutions. It \udwas  found  that  the  above  mentioned  parameters  (fly  ash  fineness,  molar  concentration  and \udcomposition  of  activator  solution,  heat  curing)  has  great  effect  on  the  physical  and  chemical \udproperties of geopolymer specimens. Optimal conditions were as follows: specific surface area \udof the fly ash above 2000 cm2/g, 10 M NaOH, 30o C heat curing temperature which resulted in 21 MPa compressive strength geopolymer

Optimization of activator solution and heat treatment of ground lignite type fly ash geopolymers