Abstract
AbstractThe objective of this study was to evaluate the self-healing effectiveness of urea-formaldehyde microcapsules with calcium nitrate as a healing agent in cement mortar. Calcium nitrate was selected as a healing agent because of its ability to react with available unhydrated cement particles in crack surfaces contributing to the formation of new hydration products that may potentially heal the crack. Self-healing capability of cement mortar with different microcapsule contents was evaluated under dry and wet healing conditions. Cracks ranging from 27.0 to 386.5 μm on average were created by three-point bending and indirect tensile tests. Cracks were observed by light microscopy over a 28-day healing period. Analysis of captured images showed signs of healing in the form of small crystallike features on the edge of the cracks on water-cured specimens after 7 days of healing. Furthermore, an improvement in self-healing efficiency was reported in specimens with microcapsule contents of 0.85 and 1.0% co...
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