Please enable JavaScript.
Coggle requires JavaScript to display documents.
Microbial Self-Healing Concrete, Saulo Sebastian Luna Del Valle, . -…
Microbial Self-Healing Concrete
Material Durability
Crack repair and structural protection
Seals cracks through CaCO formation
Restores structural integrity
Improves water tightness
Reduces penetration of aggressive agents
Enhanced mechanical properties
Compressive strength up to 42.8%
Splitting tensile strength up to 32.3%
Flexural strength up to 48%
Longevity of structures
Extends service life
Reduces maintenance frequency
Lowers repair costs
Factors influencing durability
Crack width
Effective healing up to 970 μm
Crack age
Newer cracks heal more efficiently
Moisture and temperature conditions
Activation by Environmental Conditions
Dormant bacterial spores
Remain inactive inside concrete
Can survive extreme conditions
Potential survival up to 200 years
Triggering factors
Water ingress through cracks
Availability of nutrients
Favorable temperature and pH
Environmental constraints
Concrete pH = 12–13
Hydration temperatures up to 70°C
Bacterial adaptation
Sporulation under unfavorable conditions
Germination when conditions improve
Co-cultures improve survival under stress
Suitable bacterial species
Sporosarcina pasteurii
Bacillus cereus
B. licheniformis
B. halodurans
B. muralis
B. simplex
Sustainability
Environmentally friendly repair method
Alternative to conventional crack repair
Reduced use of repair materials
Lower environmental impact
Autonomous healing
No external monitoring required
Minimal human intervention
Self-sufficient repair process
Resource efficiency
Extends lifespan of concrete structures
Reduces maintenance operations
Lowers lifecycle costs
Real-world applications
Highway retaining walls
Drainage pipe roof slabs
Ship locks
Irrigation canals
Future sustainable development
Waste-derived healing materials
Low-cost encapsulation technologies
Integration with smart monitoring systems
Calcium Carbonate Precipitation (MICP)
Microbially Induced Calcium Carbonate Precipitation
Core mechanism of self-healing
Biomineralization process
Biological process
Bacterial metabolism
Ureolysis
Nitrate reduction
Production of carbonate ions
Chemical reaction
Carbonate ions + Calcium ions
Formation of CaCO crystals
Crack-healing mechanism
Crystals accumulate within cracks
Voids and pores become filled
Concrete matrix becomes denser
Requirements for effective MICP
Active bacterial cells
Adequate calcium source
Calcium acetate
Calcium nitrate
Calcium lactate
Calcium di-glutamate
Moisture availability
Suitable temperature and pH conditions
Outcomes
Crack sealing
Reduced porosity
Improved durability
Recovery of mechanical performance
Saulo Sebastian Luna Del Valle
.