A fundamental study on whether improvements in self-healing performance can be achieved by mixing into concrete granules of self-healing agent whose main component is geo-materials instead of self-healing agent in powder form, for the purpose of preventing leakage of water through cracks was investigated. The aim of this research is rapid slump loss compensation based on the granulation process of self-healing agent whose main component is geo-materials that have high reactivity with water and includes a long-term retention of the self-healing capability of concrete incorporating self-healing agent. Comparison of concretes commercially prepared by blending in self-healing agent at ready mixed concrete plants established, through laboratory and field tests, that the 40 kg/m3 granule admixtures based on self-healing agent as a fine aggregate replacement improved the slump of ready mixed concrete and showed a high water leakage prevention effect through self-healing of cracks even after the lapse of 8 months.

Keywords: Crack, Self-healing concrete, Water leakage, Granules, Field test.