Effect of healing products on the self-healing performance of cementitious materials with crystalline admixtures

This study examined the correlation between the self-healing products and self-healing performance of cementitious materials with ground granulated blast-furnace slag, a calcium sulfoaluminate expansion agent, and crystalline additives. Self-healing products were collected through artificial cracks produced by overlapping paste slice specimens. Their phase composition was analyzed through thermogravimetry/derivative thermogravimetry by classifying calcite, portlandite, and M70-200. The phase composition generated by internal curing was analyzed through back-scattered electron imaging, exhibiting calcite, C-S-H, and C-A-H. Self-healing performance was evaluated through a water flow test, demonstrating that the greater the contents of calcite and M70-200, the better the self-healing performance. (C) 2020 Elsevier Ltd. All rights reserved.