Abstract
This study focuses on exploring the feasibility of immobilizing Bacillus subtilis with inert conductive Graphite nano/micro platelets (GNMPs) as the healing and sensing component of a smart mortar, respectively. The specimens are casted using variable content of GNMPs. The healing potential of smart mortar is accessed via visual inspections and mechanical recovery. Whereas, piezoresistivity of specimens incorporated with a range of GNMPs concentrations derived from theoretical percolation is analyzed under ultimate and cyclic loading to establish a correlation between strain and load with resistivity. Maximum average crack-width healing of 1.30 mm is recorded corresponding to specimens incorporated with 1.4% replacement of GNMPs. 1.5% replacement of GNMPs shows an 80.5% recovery of the compressive strength after healing. The self-sensing capacity of the composite mortar increases with increasing GNMP concentration up to 1.5%, with 1.2% replacement by GNMPs giving the highest gauge factor, making it the most strain-sensitive concentration.
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