Abstract
Generally, concrete structures will develop cracks under loads. To prevent these cracks self-healing concrete is made by two different approaches natural and artificial. Natural healing mechanism is investigated by an autogenous healing process, in which the self-healing occurs due to chemical reactions and involvement of water. In this paper, the main focus is on artificial approaches like the addition of crystalline admixtures, polymers, and fibers to improve the strength of concrete by healing the cracks. This paper also reviews the methods and tests used to find the self-healing capability of concrete. The reported effects of admixtures on the mechanical properties of self-healing concrete are also presented. So far, a crack width of 0.93 mm is healed underwater immersion condition. Few researches reported on the improvement of mechanical properties and thickness of cracks healed in concrete by using various polymers and fibers.
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