Bacterial Concrete- A Self Repairing Biomaterial

Bacterial Concrete- A Self Repairing Biomaterial

PRESENTATION BY Er Parampreet Kaur

Shaheed Bhagat Singh State Technical Campus Ferozepur

IntroductionCracking of Concrete is an inevitable phenomenon.Remediation of already existing cracks has been the subject of research from many years.The various products such as structural epoxy resins, other synthetic mixtures are used as a filling agents for repairing concrete.The use of Epoxy resins is neither Eco-friendly nor safe for human health.

2ObjectivesTo Study the strength regaining capacity of the cracked specimens remediated with different bacterial class.To study the durability aspects of bacterial concrete and its resistance towards freeze-thaw attack , sulphate attack, alkaki aggregate attack.To Identify microscopic evidence using scanning electron microscopy supporting bacterial participation in mineral precipitation.

Visual Aspects of Bacteria in ConcreteBacteria Efficency in Different medium Concentrations .Bacterial inherent ability to precipitate calcite continiouslyBacteria Survival Duration in Specimen.Reaction Tendency of Different Types of Bacteria under Different medium Concentrations.Bacterial Classification :- In this study the four different kinds of bacteria were used and comparison results are based on them, these are classified as:-B. PasturiiB. SubtilesB. SphaericusB. CohniiFormation Mechanism (B.Pasturii)B . Pasturii is formed by the mechanism of oxidative determination of amino acids and the nutrients required for its formation are:-TrypticaseYeast extractTricineAgar solutionGlutamic Acid

Formation Mechanism (B.Subtiles)B . Subtiles is formed by the mechanism of Hydrolysis of Urea and the nutrients required for its formation are:-UreaCalcium saltsAmmonium chlorideSodium Bicarbonate

Formation Mechanism (B. Sphaericus) B . Sphaericus is formed by the mechanism of bio oxidative analysis of Urea and the nutrients required for its formation are:-UreaYeast ExtractCalcium Salts

Formation Mechanism (B. Cohnii) B . Cohnii is formed by the mechanism of bio oxidative analysis of Urea and the nutrients required for its formation are:-PeptoneYeast extractActicalNatamycine

XRD AnalysisXRD provides most definitive structural information.It uses monochromatic beam for sample analysis.Single crystal differaction mechanism is adopted in XRD.XRD is based on the indexing the patterns.Most effective in cubic specimens.Microstructure Examinations:-It is based on the micrograph obtained by scanning electron microscopic analysis.From the micrograph it was investigated the growth of rod shaped fabulous deposition in concrete with bacteria.It also reveals the calcifying power of the different bacterial micro-organisms and their interaction with concrete.

Rod Shaped Deposition on Concrete Surface

Developing Calcite Crystals

Magnified Image of Calcite Crystals

Durability Comparison

Compressive Strength Comparision BacteriaSpecimen Compressive StrengthB. Pasturii30 B. Subtiles

33B. Sphaericus28B. Cohnii29Conclusion

B . Subtiles is found to be most effective microbiome for the crack remediation as it remediates the crack easily and helps in development of strength in early age.