INTRODUCTION
     CRACKING IN CONCRETE IS A MAIN 
     CONCERN THROUGHOUT THE WORLD 
     BECAUSE IT CAUSE LOSS OF STRENGTH OF 
     STRUCTURE WITH TIME.
     MAINTAINCE OF CRACKED STRUCTURE 
     REQUIRE LOT OF CARE AND MONEY.
     A ENVIRONMENTAL FRIENDLY SOLUTION IS 
     PREFERED i.e. BIOLOGICAL CONCRETE OVER 
     OTHER ALTERNATIVES LIKE EPOXY RESINS 
     WHICH IS NON DEGRADABLE.
    WHAT IS BIO CONCRETE
     It is a special type of concrete 
     invented by a group of microbiology 
     researchers under the head of Henk 
     jonkers.
     Bio concrete is also called as 
     BACTERIAL CONCRETE or self healing 
     concrete.
     Its specially made to increase the 
     lifespan or durability of concrete 
     structure by the self healing action of 
     that concrete.
   WHAT SPECIAL FOUND IN BIO CONCRETE
     There are two thing present in bio 
     concrete..
     1.. The special bacteria that has to 
     resist the alkalinity and the 
     mechanical stress of concrete.
     2..The chemical precursor to activate 
     bacteria.
    WHAT BACTERIA IS USED
     Most of the bacteria belongs to 
     genus bacillus are fulfilling the 
     required criteria discussed above, 
     some of the list of bacteria are ..
        B. Pseudofirmus , B. Cohnii , B. 
     Fila…etc 
     The suitable chemical precursor 
     found to be most suitable is “calcium 
     lactate” ….
    WORKING PROCESS
    Cracks less than .2mm can be auto fill by concrete.
        But it cracks are more than.2mm then concrete itself 
    thus opening passage to chemicals and other materials. 
    In bio concrete if water is the contact with the concrete 
    though the cracks the bacteria get activated from its 
    stage of dormancy formed which further in calcium 
    carbonate which act as a healing material.
    When the cracks is fill completely by the bacteria it 
    again went to the stage of dormancy again.
    Again if in future if cracks get widen and the foreign 
    particles tends to enter through the cracks the bacteria 
    gets activated and thus heal the cracks. Thus acting as 
    a long lasting healing agent.