Behaviour of bacterial concrete subjected to elevated temperatures of various exposure times

Abstract

In this paper the behaviour of M25 grade bacterial concrete exposed to various elevated temperature and thermal cycles of different durations of exposure. Introducing the bacteria Sporosarcina pasteurii into the concrete will employ the bio-mineralization phenomena to precipitate calcite minerals in the cavity pores and dried gel pores of the concrete improving the internal void structure of the concrete. So the current study will try to understand the integrity of the bacterial concrete when subjected to a different elevated temperatures of 200 ºC, 400 ºC and 600 ºC exposed for 2 hrs. , 4 hrs. and 6 hrs. duration. Compressive strength loss and weight loss is evaluated and internal structure quality is also assessed using non-destructive techniques as first part. Results suggest that till 500 -600 ºC bacteria mixed concrete produces superior results beyond that the behaviour is almost similar to that of normal concrete