self healing concrete also know as bio concrete which includes the repairing of concrete by bacteria . the video in the slide number 7 link : https://www.youtube.com/watch?v=laqACVY1U_k

1. Presentation On
SELF HEALING CONCRETE
ADVANCED ENGLISH COMMUNICATION SKILLS LAB
Presenting By:
16H61A0149
16H61A0151
16H61A0152
16H61A0153
16H61A0154
16H61A0155
ANURAG GROUP OF INSTITUTIONS
2019-20

2. Outline Of Presentation
• INTRODUCTION
• WHAT IS SHC
• TYPES OF BACTERIA IN SHC
• HEALING PROCESS
• ADVANTAGES
• DISADVANTAGES
• APPLICATIONS
• CONCLUSION

3. INTRODUCTION
• Crack formation is a typical phenomenon related to durability.
• Percolation of crack may lead to leakage problems causing
deterioration of the concrete matrix or corrosion of embedded steel
reinforcement.
• In recent years a bacteria -based self healing concrete is being
developed in order to extend the service life.
• A two component healing agent is added to the concrete mixture.
• The agent consist of bacteria and an organic mineral precursor
compound.

4. WHAT IS SELF HEALING CONCRETE
• It is a special type of concrete invented by
a group of microbiology researchers under
the head of henk jonkers.
• Self healing concrete is also known as
"BIOCONCRETE" Or "BACTERIAL
CONCRETE“
• It is specially made to increase the life
span of the durability of concrete
structures by self healing action of that
concrete.

5. WHAT BACTERIA IS USED
• Most of the bacteria belongs to genus bacillus are fulfilling required
criteria discussed above. Some of the list of bacteria are
1. Pseudofirmus
2. Cohnii
3. Filla
• The suitable chemical precursor found to be most suitable is
“CALCIUM LACTATE”.

6. WHAT IS HAPPENING INSIDE SHC
• The cracks are formed on the surface of
concrete due to many reasons like
shrinkage, inadequate water for
hydration...etc.
• The water is deliberately forced into the
cracks and the precursor is activated.
• The activated precursor interim induces
the bacteria to react with the precursor
and form abase of calcium carbonate
called as limestone and the crack is filled
up.

7. How does it works
Video source: Youtube

8. HOW THE HEALING AGENTS ARE APPLIED
1) BY DIRECT APPLICATION
– The bacteria and the chemical precursor are added directly
while making the concrete.
2) ENCAPSULATION LWA
– The part of the coarse aggregate is replaced by the light weight
aggregate ,which is impregnated with the twice the calcium
lactate solution and the spores of bacteria After impregnation
the clay particles with 6%healing agents and the concrete is
made.

9. ADVANTAGES
• Helps to fill the cracks
• Improvement in compressive strength of concrete.
• Better resistance towards freeze thaw attack reduction.
• Reduction in permeability of concrete.
• Reduction in corrosion of reinforced concrete.
• Helps to reduce maintenance and repair.

10. DISADVANTAGES
• Cost of self healing concrete is double than conventional concrete.
• Growth of any bacteria is not good in any atmosphere media.
• There is no is code or other code is available.
• Investigation of calcite precipitation is costly studied.
• Skilled labor is required.

11. APPLICATIONS
• Self healing concrete can be used for sectors such as tunnel-lining,
structural basement walls, highways, bridges, concrete floors and
marine structures.
• This is new technology can provide ways to durable roads.
• High strength buildings with more bearing capacity.
• Long lasting river banks.
• Erosion prevention of loose sand.

12. CONCLUSION
• Microbial concrete technology has proved to be the better than
many conventional technologies because of its ecofriendly nature
and self healing abilities and increase in durability of various
building materials and give them high strength for more bearing
capacity and increase the life of the building

13. Any Queries…….???

14. THANK YOU
Healing doesn’t mean the damage never existed.
It means the damage no longer controls our
lives
-TEAM
SHC