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A platform for research: civil engineering, architecture and urbanism
Bio-inspired self-healing and self-sensing cementitious mortar using Bacillus subtilis immobilized on graphitic platelets
Graphical abstract Display Omitted
Highlights Synergic self-healing and self-sensing mortar is designed via nano/micro graphite insertions. Correlation and efficacy of nano/micro graphite for Structural Health Monitoring is assessed. 1.5% addition of GNMPs shows the maximum compressive strength regained after pre-cracking. 1.2% addition of GNMPs turns out the most strain-sensitive concentration.
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.
Bio-inspired self-healing and self-sensing cementitious mortar using Bacillus subtilis immobilized on graphitic platelets
Graphical abstract Display Omitted
Highlights Synergic self-healing and self-sensing mortar is designed via nano/micro graphite insertions. Correlation and efficacy of nano/micro graphite for Structural Health Monitoring is assessed. 1.5% addition of GNMPs shows the maximum compressive strength regained after pre-cracking. 1.2% addition of GNMPs turns out the most strain-sensitive concentration.
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.
Bio-inspired self-healing and self-sensing cementitious mortar using Bacillus subtilis immobilized on graphitic platelets
Khushnood, Rao Arsalan (author) / Arif, Ajlal (author) / Shaheen, Nafeesa (author) / Zafar, Ahmad Gul (author) / Hassan, Talal (author) / Akif, Muhammad (author)
2021-11-22
Article (Journal)
Electronic Resource
English
GNMPs , Graphite nano/micro platelets , ASTM , American Society of Testing and Materials , SHM , Structural Health Monitoring , MICP , Microbial Induced Calcite Precipitation , PSA , Particle Size Analysis , FESEM , Field Emission Scanning Electron Microscopy , EDS , Energy Dispersive Spectroscopy , OM , Optical Microscopy , UVS , Ultraviolet Spectroscopy , DDF , Ductility Deformation Factor , EPT , Elastic-Plastic Toughness , CWMA , Crack Width Measurement Analysis , SRI , Strength Recovery Index , GF , Gauge Factor , FCR , Fractional Change in Resistivity , XRD , X-Ray Diffraction , TGA , Thermogravimetric Analysis , Intrinsic sensing and healing , Bacillus Subtilis , Fractional change of resistivity , Gauge factor , Theoretical percolation
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