BEHAVIOUR OF ALKALI ACTIVATED FLY ASH-BASED GEOPOLYMER CONCRETE ON THERMAL ACTIVATION

Fly ash based geo-polymers are finding a wider rang e of applications as construction as well as repairing materials due to their strength and durability under aggressive environment. Present study focusses on understanding the behavior of geo -polymer on exposure to elevated temperatures. These samples were subjected to thermal activation at 200 ºC, 400 ºC and 650ºC. The results of Fourier transform infrared spectroscopy reveal that most of the molecular water gets removed from the sample at 200ºC, while crystalline ?OH remains in the sample even at 650ºC.