This document discusses self-healing concrete that uses bacteria and chemicals embedded in the concrete to automatically repair cracks. Specifically, it contains bacteria that can survive in highly alkaline environments and secretes minerals that fill cracks when they form. The bacteria and nutrients they need are encapsulated in clay particles within the concrete. When cracks appear, water enters and allows chemical reactions between the bacteria, oxygen, and nutrients to precipitate minerals that fill the cracks over time. While this self-healing concrete is more expensive than traditional concrete, it shows promising results in reducing corrosion and maintaining strength over the long term.

1. SELF HEALING CONCRETE
UNDER THE GUIDANCE
OF
PROF. ABHAI KUMAR
VERMA
PREPARED BY.
SAURABH SINGH

2. CONTENTS
 WHAT IS SELF HEALING CONCRETE.
 WHY WE NEED.
 BACTERIA AND CHEMICAL.
 FINDING FOR RIGHT BACTERIA.
 HOW DOES BIO CONCRETE WORK.
 SCHEMATICS OF SELF HEALING PROCESS IN
BACTERIAL CONCRETE.
 PERFORMANCE GRAPH.
 DISADVANTAGES.
 CONCLUSION.

3. WHAT IS SELF HEALING
CONCRETE?
Self healing concrete are a class of material that
have the structurally incorporated ability to repair
damages in presence of special bacteria and
chemical caused by mechanical usage over time.

4. WHY WE NEED?
 To preventing concrete from cracking.
 Protection from corrosion of steel reinforcement.
 Maintaining it’s tensile strength.
 Reduction of future difficulties and expensices.

5. An example of a severely damaged concrete
support beam of a motorway
bridge

6. BACTERIA AND CHEMICAL
BACTERIA CHEMICAL
usually the bacilus
alkalinitrulicus an alkali
resistant soil bacterium
is added and some
times psychrophilic
bacteria also added.
three different
organic compounds
peptone,calcium
lactate and calcium
glutamate.

7. FINDING FOR RIGHT
BACTERIA
The starting point of research was to find bacteria
capable of surviving in extreme alkali environment
because cement and water have ph value up to 13
when mixed together which is hostile environment for
bacteria. so the bacteria can found from natural
environment such as alkali lake of Russia,carbonate
rich soil in desert area of Spain and soda lake of Egypt.

8. DIMTRI SOROKIN TAKING SAMPLES FROM
RUSSIAN SODA LAKE

9. CLAY PARTICLES LOADED WITH
BACTERIAL SPORES AND
CALCIUM LACTATE
The bacteria spores
and calcium lactate
are both embedded
in capsules, to
prevent interaction
before cracks
appear.

10. Electron microscope photograph
of bacterial spores

11. HOW DOES BIOCONCRETE
WORK
It uses following chemical reaction in presence of
bacterial spores:-
Ca(C3H5O3)2 + 7O2 —>CaCO3 + 5CO2 + 5H2O
Calcium Lactate + Oxygen —> Limestone + Carbon Dioxide + Water
5CO2 + 5Ca(OH)2 —> 5CaCO3 + 5H2O
Carbon Dioxide + Calcium Hydroxide —> Limestone + Water
Bacterial spores and calcium lactate-containing
specimens consumed substantial amounts of oxygen
rapidly after submersion in water.

12. Schematics of self healing
process in baterial concrete

13. PICTURE OF THE SURFACE OF A
SLAB OF SELF HEALING
CONCRETE
BEFORE AFTER

15. PROCESS OF SELF HEALING
(a) 3 days (b) 7 days (c) 14 days (d) 28 days
(e) 40 days (f) 200 days

16. PERFORMANCE GRAPH

17. DISADVANTAGES
THERE IS TWO KEY OBSTACLE
 Clay palletes holding self healing agents weakens
the concrete by 25% and significantly reduces it’s
compessive strengh.
 Cost self healing concrete is about double that of
conventional concrete.

18. CONCLUSION
 The development of new type of bacteria based
self healing concrete appears promising.
 Results shows that capsule containing samples
showed a significant amount of corrosion
inhibition compared to control section.
 High crack sealing capacity and healing agent is
bio based so it is sustainable.

19. THANK YOU