Sensex settled the session at 81,904.70, up 355.97 points or 0.44 per cent. The 30-share index started trading with a decent gap-up at 81,758.95 against last day's closing of 81,548.73. The index extended the momentum further amid positive global cues to hit an intraday high at 81,992.85. Nifty closed at 25,114.0, up 108.50 points or 0.43 per cent.