The pozzolanic effect

This describes the specific curing behavior of fly ash, cement dusts, and certain steel works byproducts, is based on the reaction of silicate and aluminous materials with quick lime. Here too, as with the above-mentioned additives, a higher pH causes the precipitation of metal hydroxides and carbonates. The British SEALOSAFE-Process uses fly-ash plus Portland cement, or alkali silicate glass and Fe/Al hydroxides to solidify a broad spectrum of wastes. In the POZ-O-TEC-Process, the wastes from flue gas scrubbers are solidified together with grate ash and fly-ash. The pozzolanic processes have the advantage of excellent longterm stability however, the products solidify rather slowly and are susceptible to acids. 

Lime in the form of calcium oxide (quicklime) or calcium hydroxide has long been 

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Thermo-analytical techniques are applied widely to monitor the reactions occurring in the raw clay materials and also to follow the pozzolanic effects of metakaolinite when combined with lime or cement. 

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