ABSTRACT
Concrete is very sensitive to crack formation.
As wide cracks endanger the durability, repair may be required. However, these
repair works raise the life-cycle cost of concrete as they are labor intensive
and because the structure becomes in disuse during repair. In 1994, C. Dry was
the first who proposed the intentional introduction of self-healing properties
in concrete. In the following years, several researchers started to investigate
on this topic. The aim of this study is to provide a comparison of the
different self-healing approaches which are available today. Among these
approaches, some are aimed at improving the natural mechanism of autogenous
crack healing, while others are aimed at modifying concrete by embedding
capsules with suitable healing agents or other materials so that cracks heal in
a completely autonomous way after they appear. The various methodologies have
been evaluated based on the trigger mechanism used and healing efficiency; and
attention has been paid to the effect on strength of concrete due to addition
of self-healing materials.
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