Concrete additive, which can prevent water leakage and effectively cure cracks even if cracking occurs beyond 0.2 mm to concrete hardened body Problem to be solved: to provide a self curing method of a concrete composition and a concrete hardened body capable of obtaining a concrete hardening body having a good self-healing property.Solution: an encapsulating material containing a water absorbent polymer, a coating layer coated over the surface of the encapsulated component and added to the concrete composition and at least partially removed at a predetermined time by at least one of the components and mechanical stresses in the concrete composition Concrete additive concrete composition having concrete composition and self curing method of concrete hardened body.No selection
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