SELF HEALING BACTERIAL CONCRETE
J.Thomas Britto
Dept of civil engineering
Thomasbritto3@gmail.com
P.R.engineering college, Thanjavur
ABSTRACT
Concrete is a material, which is by far the most used building material in the world.
Concrete has a large load bearing capacity for compression load, but the material is weak intension. That is why steel reinforcement bars are embedded in the material to be able to buildstructures. The steel bars take over the load when the concrete cracks in tension. The concrete onother hand protects the steel bars for attacks from the environment and prevent corrosion to takeplace. However, the cracks in the concrete form a problem. Here the ingress of water and ionstake place and deterioration of the structure starts with the corrosion of the steel. To increase thedurability of the structure either the cracks that are formed are repaired later or in the designphase extra reinforcement is placed in the structure to ensure that the crack width stay within acertain limit. This extra reinforcement is then only needed for durability reasons (to keep thecrack width small) and not for structural capacity.Especially with current steel prices this extra steel is not desirable. Durability is onereason to prevent cracks or limit crack widths. Other reasons are water tightness of structures,loss of stiffness and aesthetic reasons.
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