INFORMATION REGARDING SELF HEALING OF SMALL CRACKS IN CONCRETE MEMBERS.IT CAN BE DONE BY DIRECT, INDIRECT AND INJECTION METHOD.

1. Paper Presentation
On
“Self Healing Concrete”
Submitted By
SAHETIYA NITIN MANOHARLAL
ROLL NO:12
Under the Guidance of
Prof. Y. N. SONAWANE
Department of Civil Engineering
The Shirpur Education Society’s
R. C. Patel Institute of Technology Shirpur-425405
[2018-19]

2. CONTENT
•Introduction
•Objective
•Methodology
•Conclusion
•References

3. Defination–
Self healing concrete is a
concrete which heals itself when it
comes in contact with air and water, it
produces lime on outer layer of
concrete.
• In most of the traditional concrete
mixtures 20-30% of the cement is left
unhydrated.
• If cracking of the concrete occurs,
unreacted cement grains may
become exposed to moisture
penetrating the crack.
• In that case the hydration process
may start again and hydration
products may fill up and heal the
crack.
INTRODUCTION

4. MECHANISM
Cracks are formed in Bio-concrete structure
Bacteria comes in contact with O2 and Water
Bacteria gets activated and starts metabolic activity
Calcium lactate is used and gets converted to calcium
carbonate
Cracks are healed

5. REACTIONS
b

6. APPLICATIONS
Self Healing Bacterial concrete can be used for sector such as :
 Marines Structures.
 Tunnel Linning.
 Structural basement.
 Walls of building.
 Highway bridges.
 Conrete floors.

7. ADVANTAGES
 Microbial concrete in crack redemption.
 Improvement in Compressive strength an Durability of concrete.
 Reduction in permeability of concrete.
 Reduction in corrosion of reinforcement.
 Better reduction to freeze-thaw cycle.

8. OBJECTIVES
 To heal the cracks by bacterial precipitation.
 To investigate the effect of Bacillus species
bacteria in achieving strength in contrast to
conventional concrete.
 To improve durability and compressive strength of
concrete.
 Effective use of bio concrete in marine structure.

9. DETAILED METHODOLOGY

10. Preparation of Bacteria
•Preparation of nutrient culture medium.
•Refresh the Bacillus in culture media up to 24 hrs.
Observe for 24 hrs.
•Then make the dilutions of bacillus in distilled or
normal saline water or anyone.
•Dilutions are 10^3, 10^4, 10^5, 10^6 proportions.
•Load these dilutions in moulds.
•Good results are obtained in 10^3, 10^6 dilutions

11. CONCLUSIONS
47.20
44.30
51.30
40.52
55.90
20.80
26.20
17.63
25.00
36.73
0.00
10.00
20.00
30.00
40.00
50.00
60.00
0% 10^3 10^4 10^5 10^6
Compressivestrength
Compressive strength of Cubes
28 days
7 Days
Introducing the bacteria into the concrete makes it very beneficial it
improves the property of the concrete which is more than the conventional
concrete. Bacteria repair the cracks in concrete by producing the calcium
carbonate crystal which block the cracks and repair it.

12. REFERENCES
• M.Monishaa, Mrs.S.Nishanthi, “EXPERIMENTAL STUDY
ON STRENGTH OF SELF-HEALING CONCRETE”,
SSRG International journal of Civil Engineering-
(ICRTCETM-2017)-Special issue- April 2017
• Koustubh A. Joshi, Madhav B. Kumthekar, Vishal P
Ghodake, “Bacillus Subtilis Bacteria Impregnation in
Concrete for Enhancement in Compressive Strength”,
International Research Journal of Engineering and
Technology (IRJET) e-ISSN: 2395 -0056 Volume: 03
Issue: 05 | May-2016
• Salmabanu Luhar, Suthar Gourav, “A Review Paper on
Self Healing Concrete”, Journal of Civil Engineering
Research 2015, 5(3): 53-58 DOI:
10.5923/j.jce.20150503.01
• Prof. Sunita Mandan, R. C. Patel College Of Pharmacy,
Shirpur

13. Thank You