2019 CSCE Annual Conference - Laval (Greater Montreal) Conference
Dr. Moncef Nehdi, Western University
In this study, the change in the surface crack width due to self-healing of concrete incorporating different minerals (i.e, fly ash (FA), metakaolin (MK), bentonite(BN), calcium carbonate (CC) and sodium bicarbonate(SBI) was investigated. Cement mortar specimens were prepared with the partial substitution of cement type 10 with each mineral. In addition, PVA fiber at a dosage of 1% by volume fraction was added to the mortar mixtures. At 28 days, all specimens were cracked by applying a tensile stress and then submerged in water to allow the development of self-healing of cracks. Change in crack width in each specimen due to the healing process was investigated using optical microscopy. Results showed that self-healing of surface cracks can be improved using minerals capable to promote further carbonation.